Java从入门到实战之（28）Java 目录操作之练习

1、递归创建目录

使用 File 类的 mkdirs() 实现递归创建目录？

import java.io.File;
 
public class Main {
    public static void main(String[] args) {
        String directories = "D:\a\b\c\d\e\f\g\h\i";
        File file = new File(directories);
        boolean result = file.mkdirs();
        System.out.println("Status = " + result);
    }
}

结果：

Status = true

2、删除目录

使用 File 类的 ofdir.isDirectory(), dir.list() 和 deleteDir() 方法在一个个删除文件后删除目录？

import java.io.File;
 
public class Main {
    public static void main(String[] argv) throws Exception {
        // 删除当前目录下的 test 目录
        deleteDir(new File("./test"));
    }
    public static boolean deleteDir(File dir) {
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir
                (new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        if(dir.delete()) {
            System.out.println("目录已被删除！");
            return true;
        } else {
            System.out.println("目录删除失败！");
            return false;
        }
    }
}

结果：

目录已被删除！

3、判断目录是否为空

使用 File 类的 file.isDirectory() 和 file.list() 方法来判断目录是否为空？

import java.io.File;
 
public class Main
{
    public static void main(String[] args)
    {
        File file = new File("./testdir");  // 当前目录下的 testdir目录
        if(file.isDirectory()){
            if(file.list().length>0){
                System.out.println("目录不为空!");
            }else{
                System.out.println("目录为空!");
            }
        }else{
            System.out.println("这不是一个目录!");
        }
    }
}

结果：

目录 D://Java/file.txt 不为空！

4、判断文件是否隐藏

使用 File 类的 file.isHidden() 方法来判断文件是否隐藏？

import java.io.File;
 
public class Main {
    public static void main(String[] args) {
        File file = new File("C:/Demo.txt");
        System.out.println(file.isHidden());
    }
}

结果：

True

5、获取目录大小

使用 File 类的 FileUtils.sizeofDirectory(File Name) 来获取目录的大小？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
       dirSize(directories);
    }

   /**
   * @Description: 目录文件的大小
   * @Param: [dir]
   * @return: void
   * @Author: BigData
   * @Date: 2020/11/9
   */
    public static void dirSize(String dir) {
        File file=new File(dir);
        long size= FileUtils.sizeOfDirectory(file);
        System.out.println(dir+"的目录大小是："+size+"bytes");
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=50891:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
C:文档个人学习资料IOTest的目录大小是：79bytes

Process finished with exit code 0

6、在指定目录中查找文件

使用 File 类的 dir.list() 方法在指定目录中查找所有文件列表？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        dirFindFile(directories);
    }
    /**
    * @Description: 在指定目录中查找文件
    * @Param: [dir]
    * @return: void
    * @Author: BigData
    * @Date: 2020/11/9
    */
   private static void dirFindFile(String dir)
   {
       File file=new File(dir);
       String[] s=file.list();
       if(s==null)
       {
           System.out.println("目录不存在");
       }
       else 
       {
           for(String x:s)
           {
               System.out.println("文件名:"+x);
           }
       }
   }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=51845:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
文件名:01.txt
文件名:a
文件名:HelloWorld.txt
文件名:rainbow1.txt
文件名:rainbow2.txt
文件名:rainbowTest.txt

Process finished with exit code 0

import java.io.*;
 
class Main {
   public static void main(String[] args) {
      File dir = new File("C:");
      FilenameFilter filter = new FilenameFilter() {
         public boolean accept
         (File dir, String name) {
            return name.startsWith("b");
        }
      };
      String[] children = dir.list(filter);
      if (children == null) {
         System.out.println("目录不存在或它不是一个目录");
      } 
      else {
         for (int i=0; i < children.length; i++) {
            String filename = children[i];
            System.out.println(filename);
         }
      } 
   }
}

结果：

build
build.xml

7、获取文件的上级目录

使用 File 类的 file.getParent() 方法来获取文件的上级目录？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        getParentDir(directories);
    }
    /**
    * @Description: 获取文件父级目录
    * @Param: [dir]
    * @return: void
    * @Author: BigData
    * @Date: 2020/11/9
    */
    private static void getParentDir(String dir)
    {
        File file=new File(dir);
        System.out.println("文件上级目录是:"+file.getParent());
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=52575:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
文件上级目录是:C:文档个人学习资料

Process finished with exit code 0

8、获取目录最后修改时间

使用 File 类的 file.lastModified() 方法来获取目录的最后修改时间?

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.util.Date;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        getLastModify(directories);
    }
    /**
    * @Description: 获取目录最后修改时间
    * @Param: [dir]
    * @return: void
    * @Author: BigData
    * @Date: 2020/11/9
    */
    private static void getLastModify(String dir)
    {
        File file=new File(dir);
        System.out.println(dir+"的最后修改时间是："+new Date(file.lastModified()));
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=52675:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
C:文档个人学习资料IOTest的最后修改时间是：Mon Nov 09 14:27:33 CST 2020

Process finished with exit code 0

9、打印目录结构

使用 File 类的 file.getName() 和 file.listFiles() 方法来打印目录结构？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;
import java.util.Date;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        showDir(1,new File(directories));
    }
    /**
    * @Description: 打印目录结构
    * @Param: [indent, file]
    * @return: void
    * @Author: BigData
    * @Date: 2020/11/9
    */
    private static void showDir(int indent, File file)  {
        for (int i = 0; i < indent; i++)
            System.out.print('-');
        System.out.println(file.getName());
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++)
                showDir(indent + 4, files[i]);
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=52901:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
-IOTest
-----01.txt
-----a
---------b
-------------c
-----------------d
---------------------e
-------------------------f
-----------------------------g
---------------------------------h
-----HelloWorld.txt
-----rainbow1.txt
-----rainbow2.txt
-----rainbowTest.txt

Process finished with exit code 0

10、遍历指定目录下的所有目录

如何使用 File 类的 list 方法来遍历指定目录下的所有目录？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Date;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        ergodicDir(directories);
    }
    /**
    * @Description: 遍历指定目录下的所有目录
    * @Param: [dir]
    * @return: void
    * @Author: BigData
    * @Date: 2020/11/9
    */
    private static void ergodicDir(String dir)
    {
        File file=new File(dir);
        File[] files=file.listFiles();
        FileFilter fileFilter=new FileFilter() {
            @Override
            public boolean accept(File file1) {
                return file1.isDirectory();
            }
        };
        files=file.listFiles(fileFilter);
//        System.out.println(files.length);
        if(files.length==0)
        {
            System.out.println("目录不存在或它不是一个目录");
        }
        else
        {
           for(File x:files)
           {
               System.out.println(x.toString());
           }
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=53058:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
C:文档个人学习资料IOTesta

Process finished with exit code 0

11、输出指定目录下的所有文件

如何使用 File 类的 list 方法来输出指定目录下的所有文件？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Date;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        ergodicFile(directories);
    }

    /**
     * @Description: 遍历指定目录下的所有文件
     * @Param: [dir]
     * @return: void
     * @Author: BigData
     * @Date: 2020/11/9
     */
    private static void ergodicFile(String dir) {
        File file = new File(dir);
        String list[]=file.list();
        if(list==null)
        {
            System.out.println("目录不存在或它不是一个目录");
        }
        else
        {
            for (String x:list)
            {
                System.out.println(x);
            }
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=53139:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
01.txt
a
HelloWorld.txt
rainbow1.txt
rainbow2.txt
rainbowTest.txt

Process finished with exit code 0

12、查看系统根目录

使用 File 类的 listRoots() 方法来输出系统所有根目录？

package Practice;

import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Date;

/**
 * @program: FlinkUdf
 * @description: 文件目录
 * @author: BigData
 * @create: 2020-11-09 14:19
 **/
public class Test1 {
    public static void main(String[] args) {
        String directories = "C:\文档\个人学习资料\IOTest\";
        ergodicRootDir();
    }

    /**
     * @Description: 遍历根目录
     * @Param: [dir]
     * @return: void
     * @Author: BigData
     * @Date: 2020/11/9
     */
    private static void ergodicRootDir() {
        //技巧：Ctrl+Alt+V快速生成变量名
        File[] roots = File.listRoots();
        System.out.println("系统所有根目录：");
        for (File s:roots)
        {
            System.out.println(s.toString());
        }
    }
}

结果：

"C:Program FilesJavajdk1.8.0_221injava.exe" "-javaagent:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3libidea_rt.jar=53342:C:Program FilesJetBrainsIntelliJ IDEA 2019.3.3in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.8.0_221jrelibcharsets.jar;C:Program FilesJavajdk1.8.0_221jrelibdeploy.jar;C:Program FilesJavajdk1.8.0_221jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.8.0_221jrelibextcldrdata.jar;C:Program FilesJavajdk1.8.0_221jrelibextdnsns.jar;C:Program FilesJavajdk1.8.0_221jrelibextjaccess.jar;C:Program FilesJavajdk1.8.0_221jrelibextjfxrt.jar;C:Program FilesJavajdk1.8.0_221jrelibextlocaledata.jar;C:Program FilesJavajdk1.8.0_221jrelibext
ashorn.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunec.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunmscapi.jar;C:Program FilesJavajdk1.8.0_221jrelibextsunpkcs11.jar;C:Program FilesJavajdk1.8.0_221jrelibextzipfs.jar;C:Program FilesJavajdk1.8.0_221jrelibjavaws.jar;C:Program FilesJavajdk1.8.0_221jrelibjce.jar;C:Program FilesJavajdk1.8.0_221jrelibjfr.jar;C:Program FilesJavajdk1.8.0_221jrelibjfxswt.jar;C:Program FilesJavajdk1.8.0_221jrelibjsse.jar;C:Program FilesJavajdk1.8.0_221jrelibmanagement-agent.jar;C:Program FilesJavajdk1.8.0_221jrelibplugin.jar;C:Program FilesJavajdk1.8.0_221jrelib
esources.jar;C:Program FilesJavajdk1.8.0_221jrelib
t.jar;C:appFlinkUdf	arget	est-classes;C:Usersdefaultuser0.m2
epositoryjunitjunit4.11junit-4.11.jar;C:Usersdefaultuser0.m2
epositoryorghamcresthamcrest-core1.3hamcrest-core-1.3.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java-bridge_2.111.11.1flink-table-api-java-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-java1.11.1flink-table-api-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-java1.11.1flink-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-lang33.3.2commons-lang3-3.3.2.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-math33.5commons-math3-3.5.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-runtime_2.111.11.1flink-runtime_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-queryable-state-client-java1.11.1flink-queryable-state-client-java-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-hadoop-fs1.11.1flink-hadoop-fs-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycommons-iocommons-io2.4commons-io-2.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-netty4.1.39.Final-11.0flink-shaded-netty-4.1.39.Final-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-jackson2.10.1-11.0flink-shaded-jackson-2.10.1-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-zookeeper-33.4.14-11.0flink-shaded-zookeeper-3-3.4.14-11.0.jar;C:Usersdefaultuser0.m2
epositorycommons-clicommons-cli1.3.1commons-cli-1.3.1.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-actor_2.112.5.21akka-actor_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeconfig1.3.3config-1.3.3.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-java8-compat_2.11.7.0scala-java8-compat_2.11-0.7.0.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-stream_2.112.5.21akka-stream_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorg
eactivestreams
eactive-streams1.0.2
eactive-streams-1.0.2.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafessl-config-core_2.11.3.7ssl-config-core_2.11-0.3.7.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-protobuf_2.112.5.21akka-protobuf_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositorycom	ypesafeakkaakka-slf4j_2.112.5.21akka-slf4j_2.11-2.5.21.jar;C:Usersdefaultuser0.m2
epositoryorgclappergrizzled-slf4j_2.111.3.2grizzled-slf4j_2.11-1.3.2.jar;C:Usersdefaultuser0.m2
epositorycomgithubscoptscopt_2.113.5.0scopt_2.11-3.5.0.jar;C:Usersdefaultuser0.m2
epositoryorgxerialsnappysnappy-java1.1.4snappy-java-1.1.4.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill_2.11.7.6chill_2.11-0.7.6.jar;C:Usersdefaultuser0.m2
epositorycom	witterchill-java.7.6chill-java-0.7.6.jar;C:Usersdefaultuser0.m2
epositoryorglz4lz4-java1.6.0lz4-java-1.6.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-guava18.0-11.0flink-shaded-guava-18.0-11.0.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-java_2.111.11.1flink-streaming-java_2.11-1.11.1-tests.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-api1.7.15slf4j-api-1.7.15.jar;C:Usersdefaultuser0.m2
epositorycomgooglecodefindbugsjsr3051.3.9jsr305-1.3.9.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkforce-shading1.11.1force-shading-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-planner-blink_2.111.11.1flink-table-planner-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala_2.111.11.1flink-table-api-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-api-scala-bridge_2.111.11.1flink-table-api-scala-bridge_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-runtime-blink_2.111.11.1flink-table-runtime-blink_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninojanino3.0.9janino-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgcodehausjaninocommons-compiler3.0.9commons-compiler-3.0.9.jar;C:Usersdefaultuser0.m2
epositoryorgapachecalciteavaticaavatica-core1.16.0avatica-core-1.16.0.jar;C:Usersdefaultuser0.m2
epositoryorg
eflections
eflections.9.10
eflections-0.9.10.jar;C:Usersdefaultuser0.m2
epositoryorgjavassistjavassist3.19.0-GAjavassist-3.19.0-GA.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-streaming-scala_2.111.11.1flink-streaming-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-scala_2.111.11.1flink-scala_2.11-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-reflect2.11.12scala-reflect-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-library2.11.12scala-library-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langscala-compiler2.11.12scala-compiler-2.11.12.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-xml_2.111.0.5scala-xml_2.11-1.0.5.jar;C:Usersdefaultuser0.m2
epositoryorgscala-langmodulesscala-parser-combinators_2.111.0.4scala-parser-combinators_2.11-1.0.4.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-table-common1.11.1flink-table-common-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-core1.11.1flink-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-annotations1.11.1flink-annotations-1.11.1.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-metrics-core1.11.1flink-metrics-core-1.11.1.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwarekryokryo2.24.0kryo-2.24.0.jar;C:Usersdefaultuser0.m2
epositorycomesotericsoftwareminlogminlog1.2minlog-1.2.jar;C:Usersdefaultuser0.m2
epositoryorgobjenesisobjenesis2.1objenesis-2.1.jar;C:Usersdefaultuser0.m2
epositoryorgapachecommonscommons-compress1.20commons-compress-1.20.jar;C:Usersdefaultuser0.m2
epositoryorgapacheflinkflink-shaded-asm-77.1-11.0flink-shaded-asm-7-7.1-11.0.jar;C:Usersdefaultuser0.m2
epositorycomalibabafastjson1.2.73fastjson-1.2.73.jar;C:Usersdefaultuser0.m2
epositoryorgslf4jslf4j-log4j121.7.7slf4j-log4j12-1.7.7.jar;C:Usersdefaultuser0.m2
epositorylog4jlog4j1.2.17log4j-1.2.17.jar;C:Usersdefaultuser0.m2
epository
etsfjson-libjson-lib2.4json-lib-2.4-jdk15.jar;C:Usersdefaultuser0.m2
epositorycommons-beanutilscommons-beanutils1.8.0commons-beanutils-1.8.0.jar;C:Usersdefaultuser0.m2
epositorycommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;C:Usersdefaultuser0.m2
epositorycommons-langcommons-lang2.5commons-lang-2.5.jar;C:Usersdefaultuser0.m2
epositorycommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;C:Usersdefaultuser0.m2
epository
etsfezmorphezmorph1.0.6ezmorph-1.0.6.jar;C:Usersdefaultuser0.m2
epositoryorgjsonjson20180813json-20180813.jar" Practice.Test1
系统所有根目录：
C:

Process finished with exit code 0

13、查看当前工作目录

使用 System 的 getProperty() 方法来获取当前的工作目录？

class Main {
    public static void main(String[] args) {
        String curDir = System.getProperty("user.dir");
        System.out.println("你当前的工作目录为 :" + curDir);
    }
}

结果：

你当前的工作目录为 :/www/java

14、遍历目录

使用 File 类的 dir.isDirectory() 和 dir.list() 方法来遍历目录？

import java.io.File;
 
public class Main {
    public static void main(String[] argv) throws Exception {
        System.out.println("遍历目录");
        File dir = new File("/www/java"); //要遍历的目录
        visitAllDirsAndFiles(dir);
    }
    public static void visitAllDirsAndFiles(File dir) {
        System.out.println(dir);
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                visitAllDirsAndFiles(new File(dir, children[i]));
            }
        }
    }
}

结果：

遍历目录
/www/java
/www/java/Car.class
/www/java/FileUtil.class
/www/java/FileUtil.java
/www/java/HelloWorld.class
/www/java/HelloWorld.java
/www/java/HelloWorldDebug.class
/www/java/HelloWorldDebug.java
/www/java/Main$1.class
/www/java/Main.class
/www/java/Main.java
/www/java/MainClass.class
/www/java/MainClass.java
/www/java/MyClass.class
/www/java/outfilename
/www/java/test.log