SpringMVC实现批量上传和下载功能

分手后的思念是犯贱 2022-04-10 09:56 212阅读 0赞

# 第一.jar包 #

<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>4.3.18.RELEASE</version>
            </dependency>
    
            
            <dependency>
                <groupId>commons-fileupload</groupId>
                <artifactId>commons-fileupload</artifactId>
                <version>1.3.1</version>
            </dependency>

# 第二步.web.xml和主配置文件 #

<!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 xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
        version="4.0">
      <display-name>Archetype Created Web Application</display-name>
    
      <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:mvc-servlet.xml</param-value>
        </init-param>
      </servlet>
      <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>*.do</url-pattern>
      </servlet-mapping>
    
      
      <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>
      </filter>
    
      <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
    </web-app>

<?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" 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">
    
        <context:component-scan base-package="com.hw.controller"/>
        
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
        
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    
        </bean>
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            
            <property name="prefix" value="/"></property>
            
            <property name="suffix" value=".jsp"></property>
        </bean>
    
        
        <bean id="multipartResolver"
            class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            
            <property name="maxUploadSize" value="17367648787"></property>
            
            <property name="defaultEncoding" value="UTF-8"></property>
        </bean>
    </beans>

## 准备作为测试用的jsp页面 ##

<%--
      Created by IntelliJ IDEA.
      Date: 2019/1/4
      Time: 0:22
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page pageEncoding="utf-8" isELIgnored="false"%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <form action="up.do" enctype="multipart/form-data" method="post">
        <table>
            <tr>
                <td>请选择文件：</td>
                <td><input type="file" name="file"></td>
                <td><input type="file" name="file"></td>
                <td><input type="file" name="file"></td>
            </tr>
            <tr>
                <td>开始上传</td>
                <td><input type="submit" value="上传"></td>
            </tr>
        </table>
    </form>
    
    <%--这里只是模拟下载所以用的死数据,项目中肯定是要在数据库中取值的--%>
    <a href="/download.do?filename=IDEA.txt">
        下载
    </a>
    </body>
    </html>

# 然后就是controller了 #

package com.hw.controller;
    
    import org.apache.commons.io.FileUtils;
    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.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.multipart.MultipartFile;
    
    import java.io.File;
    import java.io.IOException;
    
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * @program: Maven
     * @description:
     * @author: hw
     * @create: 2019-01-04 00:22
     **/
    @Controller
    public class Upload {
    
    
        @RequestMapping("/upload")
        public String hello() {
            System.out.println(1);
            return "upload";
        }
    
        @RequestMapping("/up")
        public String save(@RequestParam("file") MultipartFile [] files,
                           HttpServletRequest request) {
            //可能为批量文件所以用数组接收
            for (MultipartFile file : files) {
                if (!file.isEmpty()) {
                    String contextPath = request.getContextPath();//"/SpringMvcFileUpload"
                    String servletPath = request.getServletPath();//"/up"
                    String scheme = request.getScheme();//"http"
                    //存放我们上传的文件路径
                    String storePath = "E:\\Project\\Maven\\SpringMVC3\\src\\main\\webapp\\upload";
                    //获得上传文件名
                    String fileName = file.getOriginalFilename();
                    File filepath = new File(storePath, fileName);
                    if (!filepath.getParentFile().exists()) {
                        filepath.getParentFile().mkdirs();//如果目录不存在，创建目录
                    }
                    try {
                        //把文件写入目标文件地址
                        file.transferTo(new File(storePath + File.separator + fileName));
                    } catch (Exception e) {
    
                        e.printStackTrace();
                    }
                }
            }
    //        返回页面
            return "index";
        }
    
    
        @RequestMapping("download")
        public ResponseEntity<byte[]> download(HttpServletRequest request, @RequestParam("filename") String filename,
                                               Model model) throws IOException {
            String downloadFilePath="E:\\Project\\Maven\\SpringMVC3\\src\\main\\webapp\\upload";//从我们的上传文件夹中去取
            File file = new File(downloadFilePath+File.separator+filename);//新建一个文件
            HttpHeaders headers = new HttpHeaders();//http头信息
            String downloadFileName = new String(filename.getBytes("UTF-8"),"iso-8859-1");//设置编码
            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);
        }
    }

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