springmvc文件上传下载

springmvc的文件上传和下载案例

1.项目结构

2.pom.xml

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.yunhe.ssm</groupId>
  <artifactId>ssmDemo5</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>ssmDemo5 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <!-- 引入servletAPI解决编译servlet问题 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <!-- 引入springmvc依赖包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.6.RELEASE</version>
    </dependency>
    <!-- freemarker模板引擎 -->
    <dependency>
      <groupId>org.freemarker</groupId>
      <artifactId>freemarker</artifactId>
      <version>2.3.23</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.6.RELEASE</version>
    </dependency>
    <!-- jackson依赖包 -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.8.7</version>
    </dependency>
    <!-- log4j依赖包 -->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.8.2</version>
    </dependency>
    <!-- 文件上传下载 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.2</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>ssmDemo5</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <!-- JETTY服务器插件 -->
      <plugin>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>9.4.6.v20170531</version>
      </plugin>
      <!--tomcat服务器插件-->
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.1</version>
        <configuration>
          <port>8088</port>
          <path>/</path>
          <uriEncoding>UTF-8</uriEncoding>
          <server>tomcat7</server>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

3.web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--自己指定springmvc.xml文件的位置   默认会找 springmvc-servlet.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc/springmvc.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  
</web-app>

4.log4j.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration monitorinterval="1800" status="off">
    <properties>
        <!-- 绝对路径【F://logs/sample】 -->
        <property name="LOG_HOME">logs/sample</property>
    </properties>
    <!--先定义所有的appender -->
    <appenders>
        <!--这个输出控制台的配置 -->
        <Console name="Console" target="SYSTEM_OUT">
            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch） -->
            <ThresholdFilter level="trace" onMatch="ACCEPT"
                onMismatch="DENY" />
            <!--这个都知道是输出日志的格式 -->
            <PatternLayout
                pattern="%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n" />
        </Console>
        <!--文件会打印出所有信息，这个log每次运行程序会自动清空，由append属性决定，这个也挺有用的，适合临时测试用 -->
        <File name="log" fileName="${LOG_HOME}/test.log" append="false">
            <PatternLayout
                pattern="%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n" />
        </File>
        <!--这个会打印出所有的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档 -->
        <RollingFile name="RollingFile" fileName="${LOG_HOME}/app.log"
            filePattern="${LOG_HOME}/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
            <PatternLayout
                pattern="%d{yyyy-MM-dd 'at' HH:mm:ss z} %-5level %class{36} %L %M - %msg%xEx%n" />
            <SizeBasedTriggeringPolicy size="50MB" />
        </RollingFile>
    </appenders>
    <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效 -->
    <loggers>
        <!--建立一个默认的root的logger -->
        <root level="debug">
            <appender-ref ref="RollingFile" />
            <appender-ref ref="Console" />
        </root>
    </loggers>
</configuration>

5.springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.1.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">

    <!--读取资源文件-->
    <context:property-placeholder location="classpath:system.properties"/>

    <!--扫描指定包下的注解驱动-->
    <context:component-scan base-package="cn.yunhe.controller"/>
    <!--mvc注解驱动-->
    <mvc:annotation-driven/>
    <!--处理静态资源-->
    <mvc:default-servlet-handler/>
    <!--=================================================视 图 解 析 器=========================================================-->
    <!-- JSP视图解析器 -->
    <bean
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <!-- FREEMARKER视图解析器 -->
    <bean
            class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".ftl" />
        <property name="order" value="1"></property>
        <property name="contentType" value="text/html;charset=UTF-8"></property>
    </bean>
    <bean id="freemarkerConfig"
          class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="" />
        <property name="freemarkerSettings">
            <props>
                <prop key="default_encoding">UTF-8</prop>
            </props>
        </property>
    </bean>

    <!-- 多部分文件上传 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 上传文件的大小，单位为字节 -->
        <property name="maxUploadSize" value="104857600" />
        <property name="maxInMemorySize" value="4096" />
        <!-- 请求的编码格式 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 上传文件的临时路径 -->
        <property name="uploadTempDir" value="/fileUpload/temp"></property>
    </bean>

</beans>

6.system.properties

fileSavePath=E:/photos/

7.Const.java

package cn.yunhe.controller;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Administrator on 2017/7/27.
 */
public class Const {

    public static Map<String,String> fileMap =new HashMap<String,String>();

    static{
        fileMap.put("8e95d460-6ab0-4cfe-902b-8db4ee0843cc","人.png");
    }
}

8.UpFileController.java

package cn.yunhe.controller;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.util.UUID;

/**
 * Created by Administrator on 2017/7/26.
 */
@Controller
public class UpFileController {

    private Logger logger= LogManager.getLogger(UpFileController.class);

    @Value("${fileSavePath}")
    private String fileSavaPath;

    @RequestMapping("/")
    public String upmenu(){

        return "upfile";
    }

    @RequestMapping(value = "/upfile",method = RequestMethod.POST)
    public String upfile(String username, MultipartFile[] userhand) {
        logger.debug("username="+username+",userhand="+userhand);

        for (MultipartFile mult:userhand){
            String fileName= UUID.randomUUID().toString();
            Const.fileMap.put(fileName,mult.getOriginalFilename());
            try {
                mult.transferTo(new File(fileSavaPath+fileName));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return "success";
    }
}

9.DownFileController.java

package cn.yunhe.controller;

import org.apache.commons.io.IOUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * Created by Administrator on 2017/7/26.
 */
@Controller
public class DownFileController {

    private Logger logger= LogManager.getLogger(DownFileController.class);

    @Value("${fileSavePath}")
    private String fileSavaPath;

    @RequestMapping("/downfile")
    public void downFile(String  filename, HttpServletResponse resp){
        logger.debug("fileSavaPath="+fileSavaPath);
        resp.setContentType("application/octet-stream; charset=utf-8");
        //设置文件名
        String realOriginalFilename = Const.fileMap.get(filename);
        String aa = null;
        try {
            aa = new String(realOriginalFilename.getBytes("utf-8"),"ISO-8859-1");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        resp.setHeader("Content-Disposition", "attachment; filename=" + aa);//以附件方式下载，防止浏览器直接打开
        try {
            IOUtils.copy(new FileInputStream(new File(fileSavaPath, filename)), resp.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}