springmvc之文件上传下载

技术2022-07-13 79

web.xml文件配置 <?xml version="1.0" encoding="UTF-8"?> <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">  <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>  <filter> <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app> springmvc.xml文件配置 <?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: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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">  <context:component-scan base-package="com.liang.controller"></context:component-scan>  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value=""></property> <property name="suffix" value=".jsp"></property> </bean>  <mvc:default-servlet-handler></mvc:default-servlet-handler>  <mvc:annotation-driven></mvc:annotation-driven> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="#{1024*1024*20}"></property> <property name="defaultEncoding" value="utf-8"></property> </bean> </beans> 前端代码 <%-- Created by IntelliJ IDEA. User: liang Date: 20-7-1 Time: 下午8:34 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>文件上传</title> </head> <body> ${msg} <form action="/fileuploads" method="post" enctype="multipart/form-data"> 上传文件：<input type="file" name="filename" multiple="multiple"/><br> 上传文件：<input type="file" name="filename" multiple="multiple"/><br> 上传文件：<input type="file" name="filename" multiple="multiple"/><br> 上传文件：<input type="file" name="filename" multiple="multiple"/><br> <input type="submit" value="确定"> </form> <br> <a href="/downfile?name=878.jpg" rel="nofollow">下载图片1</a><br> <a href="/downfile?name=何山 - 何山-满城花开.mp3" rel="nofollow">何山 - 何山-满城花开.mp3</a> </body> </html> 后端代码 package com.liang.controller; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; 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.multipart.MultipartFile; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import java.io.*; @Controller public class fileUpload { //单文件上传 @RequestMapping("fileupload") public String fileupload(@RequestParam("filename") MultipartFile file, Model model) { System.out.println("文件项名字" + file.getName()); System.out.println("文件名字" + file.getOriginalFilename()); try { file.transferTo(new File("/home/liang/文件/" + file.getOriginalFilename())); model.addAttribute("msg", "文件上传成功"); } catch (IOException e) { model.addAttribute("msg", "文件上传失败"); e.printStackTrace(); } return "forward:/index.jsp"; } // 批量文件上传 @RequestMapping("fileuploads") public String fileuploads(@RequestParam("filename") MultipartFile[] files, Model model) { for (MultipartFile file : files) { System.out.println("文件项名字" + file.getName()); System.out.println("文件名字" + file.getOriginalFilename()); try { file.transferTo(new File("/home/liang/文件/" + file.getOriginalFilename())); } catch (IOException e) { e.printStackTrace(); } } model.addAttribute("msg", "文件上传成功"); return "forward:/index.jsp"; } // 文件下载 @RequestMapping("/downfile") public ResponseEntity<byte[]> download(HttpServletRequest request) throws Exception { request.setCharacterEncoding("UTF-8"); //获取文件名 String filename = request.getParameter("name"); //解决get请求中文乱码 filename = new String(filename.getBytes("iso-8859-1"),"utf-8"); System.out.println(filename); //1、得到要下载的文件的流； //找到要下载的文件的真实路径 // ServletContext context = request.getServletContext(); String realPath = String.format("/home/liang/文件/%s", filename); FileInputStream is = new FileInputStream(realPath); byte[] tmp = new byte[is.available()]; is.read(tmp); is.close(); //2、将要下载的文件流返回 HttpHeaders httpHeaders = new HttpHeaders(); httpHeaders.set("Content-Disposition", "attachment;filename=" + filename); return new ResponseEntity<byte[]>(tmp, httpHeaders, HttpStatus.OK); } }

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