分享知识-快乐自己：SpringMvc中的单多文件上传及文件下载

摘要：SpringMvc中的单多文件上传及文件下载：（以下是核心代码（拿过去直接能用）不谢）

<!--设置文件上传需要的jar-->

<dependency>

      <groupId>commons-fileupload</groupId>

      <artifactId>commons-fileupload</artifactId>

      <version>1.3.1</version>

</dependency>

ControllerWelcome 控制器类：

package controller;

import bean.User;

import org.apache.commons.io.FileUtils;

import org.apache.commons.lang3.RandomUtils;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

import org.springframework.validation.BindingResult;

import org.springframework.validation.annotation.Validated;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpSession;

import java.io.File;

import java.io.IOException;

import java.lang.reflect.Field;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

/**

 * @author asus

 */

@Controller

@RequestMapping("/user")

public class ControllerWelcome {

　　//单文件上传（User对象的属性名与表单中的name名一致方可自动映射到值）

    @RequestMapping("/upload")

    public ModelAndView upload(User user, MultipartFile picPath, HttpSession session) {

        ModelAndView modelAndView = new ModelAndView("Welcome");

        //获取服务器路径

        String realPath = session.getServletContext().getRealPath("/upload/");

        //判断是否存在，不存在则创建

        File file = new File(realPath);

        if (!file.exists()) {

            file.mkdir();

        }

        //获取源文件名称

        String originalFilename = picPath.getOriginalFilename();

        String fileName = System.currentTimeMillis() + RandomUtils.nextInt(0, 1000000) + originalFilename;

        File file1 = new File(realPath, fileName);

        try {

            picPath.transferTo(file1);

            System.out.println("用户名为：" + user.getUseName());

            System.out.println("上传成功:" + realPath);

        } catch (IOException e) {

            e.printStackTrace();

        }

        return modelAndView;

    }

　　//多文件上传（User对象中的属性名与表单的name名一致方可自动映射到值）

    @RequestMapping("/uploads")

    public ModelAndView uploads(User user, @RequestParam MultipartFile[] picPath, HttpSession session) {

        ModelAndView modelAndView = new ModelAndView("Welcome");

        //获取服务器路径

        String realPath = session.getServletContext().getRealPath("/upload/");

        //判断是否存在，不存在则创建

        File file = new File(realPath);

        if (!file.exists()) {

            file.mkdir();

        }

        for (MultipartFile temp : picPath) {

            //获取源文件名称

            String originalFilename = temp.getOriginalFilename();

            String fileName = System.currentTimeMillis() + RandomUtils.nextInt(0, 1000000) + originalFilename;

            File file1 = new File(realPath, fileName);

            try {

                temp.transferTo(file1);

                System.out.println("用户名为：" + user.getUseName());

                System.out.println("上传成功:" + realPath);

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return modelAndView;

    }

    //文件下载

    @RequestMapping(value = "/download", method = RequestMethod.GET) //匹配的是href中的download请求

    public ResponseEntity<byte[]> download(@RequestParam("filename") String filename

    ) throws IOException {

        //从我们的上传文件夹中去取

        String downloadFilePath = "E:\\idealCase\\CourseNotes\\SpringMvcCase\\SpringMvcCode06\\target\\SpringMvcCode06\\upload";

        //新建一个文件

        File file = new File(downloadFilePath + File.separator + filename);

        //http头信息

        HttpHeaders headers = new HttpHeaders();

        //设置编码

        String downloadFileName = new String(filename.getBytes("UTF-8"), "iso-8859-1");

        headers.setContentDispositionFormData("attachment", downloadFileName);

        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        //MediaType:互联网媒介类型  contentType：具体请求中的媒体类型信息

        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),

                headers, HttpStatus.CREATED);

    }

}

核心配置文件：Spring-view.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:context="http://www.springframework.org/schema/context"

       xmlns:aop="http://www.springframework.org/schema/aop"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd

        http://www.springframework.org/schema/tx

        http://www.springframework.org/schema/tx/spring-tx.xsd

        http://www.springframework.org/schema/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--指定Controller扫描器-->

    <context:component-scan base-package="controller"/>

    <!--配置试图解析器-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

    <!--配置文件上传解析器-->

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

        <property name="defaultEncoding" value="UTF-8"/>

        <!--单个文件大小-->

        <property name="maxUploadSizePerFile" value="100000"/>

        <!--文件总大小-->

        <property name="maxUploadSize" value="100000"/>

    </bean>

</beans>

web.xml 配置文件：

<!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>

  <!--设置乱码-->

  <filter>

    <filter-name>encodingFilter</filter-name>

    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

    <init-param>

      <param-name>encoding</param-name>

      <param-value>UTF-8</param-value>

    </init-param>

    <init-param>

      <param-name>forceEncoding</param-name>

      <param-value>true</param-value>

    </init-param>

  </filter>

  <filter-mapping>

    <filter-name>encodingFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

  <!--设置核心控制器-->

  <servlet>

    <servlet-name>mvc</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>

      <param-name>contextConfigLocation</param-name>

      <param-value>classpath*:Spring-*.xml</param-value>

    </init-param>

    <!--优先加载-->

    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

    <servlet-name>mvc</servlet-name>

    <url-pattern>/</url-pattern>

  </servlet-mapping>

</web-app>

index.jsp 前端页面：

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>

<html>

<body>

<h2>Hello World!</h2>

<fieldset>

    <legend>单文件上传：</legend>

    <form action="/user/upload" method="post" enctype="multipart/form-data">

        用户名：<input type="text" name="useName"><br/>

        文件一：<input type="file" name="picPath">

        <input type="submit" value="提交">

    </form>

</fieldset>

<br/><br/>

<fieldset>

    <legend>多文件上传：</legend>

    <form action="/user/uploads" method="post" enctype="multipart/form-data">

        用户名：<input type="text" name="useName"><br/>

        文件一：<input type="file" name="picPath">

        文件一：<input type="file" name="picPath">

        <input type="submit" value="提交">

    </form>

</fieldset>

<br/><br/>

<fieldset>

    <legend>文件下载</legend>

    <a href="/user/download?filename=1537854894247新建文本文档.txt">

        文件下载：1537854894247新建文本文档.txt</a>

</fieldset>

</body>

</html>