springMVC实现文件上传和下载

  springmvcorg.springframework.web.servlet.DispatcherServlet contextConfigLocationclasspath:applicationContext.xml1 springmvc/ encodingorg.springframework.web.filter.CharacterEncodingFilter encodingutf-8 encoding/*

   <title>$Title$</title>  <br />点击下载

   <!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理，根据自己的项目扫描包 --><!-- 注解驱动 -->      <!-- 静态资源过滤--><!-- 视图解析器 --> <!-- 前缀 --><!-- 后缀 --><!--文件上传配置--> <!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 --><!-- 上传文件大小上限，单位为字节（10485760=10M） -->

 package com.zky.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.commons.CommonsMultipartFile; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.net.URLEncoder; @Controller public class FileController { //@RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象 //批量上传CommonsMultipartFile则为数组即可 @RequestMapping("/upload") public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException { //获取文件名 : file.getOriginalFilename(); String uploadFileName = file.getOriginalFilename(); //如果文件名为空，直接回到首页！ if ("".equals(uploadFileName)){ return "redirect:/index.jsp"; } System.out.println("上传文件名 : "+uploadFileName); //上传路径保存设置 String path = request.getServletContext().getRealPath("/upload"); //如果路径不存在，创建一个 File realPath = new File(path); if (!realPath.exists()){ realPath.mkdir(); } System.out.println("上传文件保存地址："+realPath); InputStream is = file.getInputStream(); //文件输入流 OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件输出流 //读取写出 int len=0; byte[] buffer = new byte[1024]; while ((len=is.read(buffer))!=-1){ os.write(buffer,0,len); os.flush(); } os.close(); is.close(); return "redirect:/index.jsp"; } }

 /* * 采用file.Transto 来保存上传的文件 */ @RequestMapping("/upload2") public String  fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException { //上传路径保存设置 String path = request.getServletContext().getR<span style="color:transparent">来源gaodai#ma#com搞*代#码网</span>ealPath("/upload"); File realPath = new File(path); if (!realPath.exists()){ realPath.mkdir(); } //上传文件地址 System.out.println("上传文件保存地址："+realPath); //通过CommonsMultipartFile的方法直接写文件（注意这个时候） file.transferTo(new File(realPath +"/"+ file.getOriginalFilename())); return "redirect:/index.jsp"; }

 @RequestMapping(value="/download") public String downloads(HttpServletResponse response , HttpServletRequest request) throws Exception{ //要下载的图片地址，改为自己图片路径,我是下载在我的项目里面的 String  path = request.getServletContext().getRealPath("/upload"); //文件名 String  fileName = "新建文本文档.txt"; //1、设置response 响应头 response.reset(); //设置页面不缓存,清空buffer response.setCharacterEncoding("UTF-8"); //字符编码 response.setContentType("multipart/form-data"); //二进制传输数据 //设置响应头 response.setHeader("Content-Disposition", "attachment;fileName="+ URLEncoder.encode(fileName, "UTF-8")); File file = new File(path,fileName); //2、 读取文件--输入流 InputStream input=new FileInputStream(file); //3、 写出文件--输出流 OutputStream out = response.getOutputStream(); byte[] buff =new byte[1024]; int index=0; //4、执行 写出操作 while((index= input.read(buff))!= -1){ out.write(buff, 0, index); out.flush(); } out.close(); input.close(); return null; }