1、本人在腾讯云安装hadoop2.7.7，详细安装请看以前的博客
2、pom.xml文件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.7.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.hadoop</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <hadoop.version>2.7.7</hadoop.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>2.1.3.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>2.2.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.20</version> <scope>provided</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.0</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>${hadoop.version}</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>${hadoop.version}</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>${hadoop.version}</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> <profiles> <profile> <id>dev</id> <properties> <activatedProperties>dev</activatedProperties> </properties> <!-- 这里代表默认使用dev环境配置文件 --> <activation> <activeByDefault>true</activeByDefault> </activation> </profile> <profile> <id>test</id> <properties> <activatedProperties>test</activatedProperties> </properties> </profile> <profile> <id>prod</id> <properties> <activatedProperties>prod</activatedProperties> </properties> </profile> </profiles> </project>
3、yml文件
spring: profiles: active: @activatedProperties@ main: show-banner: false hadoop.name-node: hdfs://132.232.44.82:9000 hadoop.namespace: /mydata # hadoop: # fsUri: hdfs://132.232.44.82:9000 #端口 server: port: 8080 #log日志 logging: level: com: hadoop: demo: dao: debug #mybatis-plus mybatis-plus: typeAliasesPackage: com.hadoop.demo.entity mapperLocations: classpath:mapper/*.xml --- #开发配置 spring: profiles: dev datasource: url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=GMT%2B8 #url: jdbc:mysql://localhost:3306/test username: root password: yang156122 driver-class-name: com.mysql.jdbc.Driver # 使用druid数据源 type: com.alibaba.druid.pool.DruidDataSource
4、HdfsUtils.java
package com.hadoop.demo.utils; import lombok.extern.slf4j.Slf4j; import org.apache.commons.lang.StringUtils; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.*; import org.apache.hadoop.hdfs.DistributedFileSystem; import org.apache.hadoop.hdfs.protocol.DatanodeInfo; import java.io.IOException; import java.net.URI; /** * hdfs基本操作 */ @Slf4j public class HdfsUtils { /** * 获取文件系统 * @param hdfsUri nameNode地址 如"hdfs://10.10.1.142:9000" * @return */ public static FileSystem getFileSystem(String hdfsUri) { //读取配置文件 Configuration conf = new Configuration(); // 文件系统 FileSystem fs = null; if(StringUtils.isBlank(hdfsUri)){ // 返回默认文件系统 如果在 Hadoop集群下运行，使用此种方法可直接获取默认文件系统 try { fs = FileSystem.get(conf); } catch (IOException e) { log.error("", e); } }else{ // 返回指定的文件系统,如果在本地测试，需要使用此种方法获取文件系统 try { URI uri = new URI(hdfsUri.trim()); fs = FileSystem.get(uri,conf); } catch (Exception e) { log.error("", e); } } return fs; } /** * 创建文件目录 * * @param hdfsUri * @param path */ public static void mkdir(String hdfsUri, String path) { try { // 获取文件系统 FileSystem fs = getFileSystem(hdfsUri); if(StringUtils.isNotBlank(hdfsUri)){ path = hdfsUri + path; } // 创建目录 fs.mkdirs(new Path(path)); //释放资源 fs.close(); } catch (IllegalArgumentException | IOException e) { log.error("", e); } } /** * 删除文件或者文件目录 * * @param path */ public static void rmdir(String hdfsUri,String path) { try { // 返回FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); if(StringUtils.isNotBlank(hdfsUri)){ path = hdfsUri + path; } // 删除文件或者文件目录 delete(Path f) 此方法已经弃用 fs.delete(new Path(path),true); // 释放资源 fs.close(); } catch (IllegalArgumentException | IOException e) { log.error("", e); } } /** * 根据filter获取目录下的文件 * * @param path * @param pathFilter * @return String[] */ public static String[] listFile(String hdfsUri, String path,PathFilter pathFilter) { String[] files = new String[0]; try { // 返回FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); if(StringUtils.isNotBlank(hdfsUri)){ path = hdfsUri + path; } FileStatus[] status; if(pathFilter != null){ // 根据filter列出目录内容 status = fs.listStatus(new Path(path),pathFilter); }else{ // 列出目录内容 status = fs.listStatus(new Path(path)); } // 获取目录下的所有文件路径 Path[] listedPaths = FileUtil.stat2Paths(status); // 转换String[] if (listedPaths != null && listedPaths.length > 0){ files = new String[listedPaths.length]; for (int i = 0; i < files.length; i++){ files[i] = listedPaths[i].toString(); } } // 释放资源 fs.close(); } catch (IllegalArgumentException | IOException e) { log.error("", e); } return files; } /** * 文件上传至 HDFS * @param hdfsUri * @param delSrc 指是否删除源文件，true为删除，默认为false * @param overwrite * @param srcFile 源文件，上传文件路径 * @param destPath hdfs的目的路径 */ public static void copyFileToHDFS(String hdfsUri,boolean delSrc, boolean overwrite,String srcFile,String destPath) { // 源文件路径是Linux下的路径，如果在 windows 下测试，需要改写为Windows下的路径，比如D://hadoop/djt/weibo.txt Path srcPath = new Path(srcFile); // 目的路径 if(StringUtils.isNotBlank(hdfsUri)){ destPath = hdfsUri + destPath; } Path dstPath = new Path(destPath); // 实现文件上传 try { // 获取FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); fs.copyFromLocalFile(srcPath, dstPath); fs.copyFromLocalFile(delSrc,overwrite,srcPath, dstPath); //释放资源 fs.close(); } catch (IOException e) { log.error("", e); } } /** * 从 HDFS 下载文件 * * @param srcFile * @param destPath 文件下载后,存放地址 */ public static void getFile(String hdfsUri, String srcFile,String destPath) { // 源文件路径 if(StringUtils.isNotBlank(hdfsUri)){ srcFile = hdfsUri + srcFile; } Path srcPath = new Path(srcFile); Path dstPath = new Path(destPath); try { // 获取FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); // 下载hdfs上的文件 fs.copyToLocalFile(srcPath, dstPath); // 释放资源 fs.close(); } catch (IOException e) { log.error("", e); } } /** * 获取 HDFS 集群节点信息 * * @return DatanodeInfo[] */ public static DatanodeInfo[] getHDFSNodes(String hdfsUri) { // 获取所有节点 DatanodeInfo[] dataNodeStats = new DatanodeInfo[0]; try { // 返回FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); // 获取分布式文件系统 DistributedFileSystem hdfs = (DistributedFileSystem)fs; dataNodeStats = hdfs.getDataNodeStats(); } catch (IOException e) { log.error("", e); } return dataNodeStats; } /** * 查找某个文件在 HDFS集群的位置 * * @param filePath * @return BlockLocation[] */ public static BlockLocation[] getFileBlockLocations(String hdfsUri, String filePath) { // 文件路径 if(StringUtils.isNotBlank(hdfsUri)){ filePath = hdfsUri + filePath; } Path path = new Path(filePath); // 文件块位置列表 BlockLocation[] blkLocations = new BlockLocation[0]; try { // 返回FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); // 获取文件目录 FileStatus filestatus = fs.getFileStatus(path); //获取文件块位置列表 blkLocations = fs.getFileBlockLocations(filestatus, 0, filestatus.getLen()); } catch (IOException e) { log.error("", e); } return blkLocations; } /** * 判断目录是否存在 * @param hdfsUri * @param filePath * @param create * @return */ public boolean existDir(String hdfsUri,String filePath, boolean create){ boolean flag = false; if (StringUtils.isEmpty(filePath)){ return flag; } try{ Path path = new Path(filePath); // FileSystem对象 FileSystem fs = getFileSystem(hdfsUri); if (create){ if (!fs.exists(path)){ fs.mkdirs(path); } } if (fs.isDirectory(path)){ flag = true; } }catch (Exception e){ log.error("", e); } return flag; } }
5、HadoopConfig.java
package com.hadoop.demo.config; import lombok.extern.slf4j.Slf4j; import org.apache.hadoop.fs.FileSystem; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import java.net.URI; @Configuration @ConditionalOnProperty(name="hadoop.name-node") @Slf4j public class HadoopConfig { @Value("${hadoop.name-node}") private String nameNode; /** * Configuration conf=new Configuration（）； * 创建一个Configuration对象时，其构造方法会默认加载hadoop中的两个配置文件， * 分别是hdfs-site.xml以及core-site.xml，这两个文件中会有访问hdfs所需的参数值， * 主要是fs.default.name，指定了hdfs的地址，有了这个地址客户端就可以通过这个地址访问hdfs了。 * 即可理解为configuration就是hadoop中的配置信息。 * @return */ @Bean("fileSystem") public FileSystem createFs() throws Exception{ //读取配置文件 org.apache.hadoop.conf.Configuration conf = new org.apache.hadoop.conf.Configuration(); conf.set("fs.defalutFS", nameNode); conf.set("dfs.replication", "1"); FileSystem fs = null; //conf.set("fs.defaultFS","hdfs://ns1"); //指定访问hdfs的客户端身份 //fs = FileSystem.get(new URI(nameNode), conf, "root"); // 文件系统 // 返回指定的文件系统,如果在本地测试，需要使用此种方法获取文件系统 try { URI uri = new URI(nameNode.trim()); fs = FileSystem.get(uri,conf,"root"); } catch (Exception e) { log.error("", e); } System.out.println("fs.defaultFS: "+conf.get("fs.defaultFS")); return fs; } }
6、HadoopTemplate.java
package com.hadoop.demo.config; import lombok.extern.slf4j.Slf4j; import org.apache.commons.lang.StringUtils; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.autoconfigure.condition.ConditionalOnBean; import org.springframework.stereotype.Component; import javax.annotation.PostConstruct; import java.io.IOException; @Component @ConditionalOnBean(FileSystem.class) @Slf4j public class HadoopTemplate { @Autowired private FileSystem fileSystem; @Value("${hadoop.name-node}") private String nameNode; @Value("${hadoop.namespace:/}") private String nameSpace; @PostConstruct public void init(){ existDir(nameSpace,true); } public void uploadFile(String srcFile){ copyFileToHDFS(false,true,srcFile,nameSpace); } public void uploadFile(boolean del,String srcFile){ copyFileToHDFS(del,true,srcFile,nameSpace); } public void uploadFile(String srcFile,String destPath){ copyFileToHDFS(false,true,srcFile,destPath); } public void uploadFile(boolean del,String srcFile,String destPath){ copyFileToHDFS(del,true,srcFile,destPath); } public void delFile(String fileName){ rmdir(nameSpace,fileName) ; } public void delDir(String path){ nameSpace = nameSpace + "/" +path; rmdir(path,null) ; } public void download(String fileName,String savePath){ getFile(nameSpace+"/"+fileName,savePath); } /** * 创建目录 * @param filePath * @param create * @return */ public boolean existDir(String filePath, boolean create){ boolean flag = false; if(StringUtils.isEmpty(filePath)){ throw new IllegalArgumentException("filePath不能为空"); } try{ Path path = new Path(filePath); if (create){ if (!fileSystem.exists(path)){ fileSystem.mkdirs(path); } } if (fileSystem.isDirectory(path)){ flag = true; } }catch (Exception e){ log.error("", e); } return flag; } /** * 文件上传至 HDFS * @param delSrc 指是否删除源文件，true为删除，默认为false * @param overwrite * @param srcFile 源文件，上传文件路径 * @param destPath hdfs的目的路径 */ public void copyFileToHDFS(boolean delSrc, boolean overwrite,String srcFile,String destPath) { // 源文件路径是Linux下的路径，如果在 windows 下测试，需要改写为Windows下的路径，比如D://hadoop/djt/weibo.txt Path srcPath = new Path(srcFile); // 目的路径 if(StringUtils.isNotBlank(nameNode)){ destPath = nameNode + destPath; } Path dstPath = new Path(destPath); // 实现文件上传 try { // 获取FileSystem对象 fileSystem.copyFromLocalFile(srcPath, dstPath); fileSystem.copyFromLocalFile(delSrc,overwrite,srcPath, dstPath); //释放资源 // fileSystem.close(); } catch (IOException e) { log.error("", e); } } /** * 删除文件或者文件目录 * * @param path */ public void rmdir(String path,String fileName) { try { // 返回FileSystem对象 if(StringUtils.isNotBlank(nameNode)){ path = nameNode + path; } if(StringUtils.isNotBlank(fileName)){ path = path + "/" +fileName; } // 删除文件或者文件目录 delete(Path f) 此方法已经弃用 fileSystem.delete(new Path(path),true); } catch (IllegalArgumentException | IOException e) { log.error("", e); } } /** * 从 HDFS 下载文件 * * @param hdfsFile * @param destPath 文件下载后,存放地址 */ public void getFile(String hdfsFile,String destPath) { // 源文件路径 if(StringUtils.isNotBlank(nameNode)){ hdfsFile = nameNode + hdfsFile; } Path hdfsPath = new Path(hdfsFile); Path dstPath = new Path(destPath); try { // 下载hdfs上的文件 fileSystem.copyToLocalFile(hdfsPath, dstPath); // 释放资源 // fs.close(); } catch (IOException e) { log.error("", e); } } public String getNameSpace(){ return nameSpace; } }
7、HdfsController.java
package com.hadoop.demo.controller; import com.hadoop.demo.config.HadoopTemplate; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController public class HdfsController { @Autowired private HadoopTemplate hadoopTemplate; /** * 将本地文件srcFile,上传到hdfs * @param srcFile * @return */ @RequestMapping("/upload") public String upload(@RequestParam String srcFile){ hadoopTemplate.uploadFile(srcFile); return "copy"; } @RequestMapping("/delFile") public String del(@RequestParam String fileName){ hadoopTemplate.delFile(fileName); return "delFile"; } @RequestMapping("/download") public String download(@RequestParam String fileName,@RequestParam String savePath){ hadoopTemplate.download(fileName,savePath); return "download"; } }
注意！注意！基本的代码已经可以了，接下来就是遇到的坑！！！
1、Failed to locate the winutils binary in the hadoop binary path，这个错误表示没有安装本地的hadoop
解决方法： 下载：https://github.com/srccodes/hadoop-common-2.7.1-bin 将bin目录的文件复制到hadoop的目录中(覆盖原有的文件哦！) win10添加系统环境变量 HADOOP_HOME ：D:softwarehadoop-devhadoop-common-2.7.1-bin-master
CLASSPATH ：D:softwarehadoop-devhadoop-2.7.7inwinutils.exe 在path中将变量添加进去 %HADOOP_HOME%in
2、直接在启动类中添加System.setProperty("hadoop.home.dir", "D:\software\hadoop-dev\hadoop-2.7.7");
import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; @MapperScan("com.hadoop.demo.dao") @SpringBootApplication //@ComponentScan(value = "com.hadoop.demo.config") public class DemoApplication { public static void main(String[] args) { System.setProperty("hadoop.home.dir", "D:\software\hadoop-dev\hadoop-2.7.7"); SpringApplication.run(DemoApplication.class, args); } }
3、远程访问9000端口，被拒绝访问，127.0.0.1:9000 表示只允许本机访问，所以要修改hosts文件
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 8593/java
修改：
132.232.44.82 localhost.localdomain localhost 132.232.44.82 localhost4.localdomain4 localhost4 0.0.0.0 medecineit ::1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6
坑也只有这几个！完毕！