我这里写了一个单个文件上传的例子，但不知道怎么弄成多个上传，而且可以判断文件是否重复。`<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

 
 
 
springMVC包装类上传文件
 
 
  
   
 
  Click To Upload 

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@Controller @RequestMapping("file") public class FileController { private final static String UPLOAD="E:/file/upload/"; @RequestMapping("file") public String toFileJsp(){ return "upLoadFile"; } @RequestMapping("upload2") public String uploadTwo(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException { //创建一个通用的多部分解析器 CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(request.getSession().getServletContext()); //判断 request 是否有文件上传,即多部分请求 if(multipartResolver.isMultipart(request)){ //转换成多部分request MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext()); MultipartHttpServletRequest multiRequest = resolver.resolveMultipart(request); //MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request; //取得request中的所有文件名 Iterator iterator=multiRequest.getFileNames(); while(iterator.hasNext()){ //记录上传过程起始时的时间，用来计算上传时间 int startTime=(int)System.currentTimeMillis(); //取得上传文件 MultipartFile file=multiRequest.getFile(iterator.next()); if(file!=null){ //取得当前上传文件的文件名称 String fileName=file.getOriginalFilename(); //如果名称不为“”,说明该文件存在，否则说明该文件不存在 if(fileName.trim() != ""){ System.out.println("文件名为："+fileName); //定义上传路径 String path="E:/file/"+fileName; File localFile=new File(path); file.transferTo(localFile); } } //记录上传该文件后的时间 int endTime=(int)System.currentTimeMillis(); System.out.println("所用时间为："+(endTime-startTime)); } } return "success"; } @RequestMapping(value="uploadFile",method=RequestMethod.POST) @ResponseBody public Respon uploadFile(HttpServletRequest request){ MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext()); MultipartHttpServletRequest req = resolver.resolveMultipart(request); Respon respon=new Respon(Constant.CODE_ERROR,Constant.CODE_ERROR_STRING); MultipartFile file=req.getFile("avatar"); if(file.getSize()>10*1024*1024){ respon.setMsg("文件不得超过10M"); return respon; } String fileName=file.getOriginalFilename(); if(fileName.lastIndexOf(".")==-1){ respon.setMsg("文件异常"); return respon; } String ext=fileName.substring(fileName.lastIndexOf(".")); List list=Arrays.asList(new String[]{".png",".jpg",".jpeg",".bmp"}); if(!list.contains(ext.toLowerCase())){ respon.setMsg("文件格式不允许"); return respon; } //String base=request.getSession().getServletContext().getRealPath("/"); SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd"); String newName=sdf.format(new Date())+"-"+UUID.randomUUID().toString()+ext; //String parentPath=base+UPLOAD; String parentPath=UPLOAD; File f=new File(parentPath); if(!f.exists()){ f.mkdirs(); } //String fileRealPath=base+UPLOAD+newName; String fileRealPath=UPLOAD+newName; File f2=new File(fileRealPath); if(f2.exists()){ f2.delete(); } try { file.transferTo(f2); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } String webPath=UPLOAD+newName; respon.setCode(Constant.CODE_SUCCESS); respon.setMsg(Constant.CODE_SUCCESS_STRING); respon.setData(webPath); return respon; } }