public AjaxJson upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException {
AjaxJson json = new AjaxJson();
//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
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
//取得request中的所有文件名
Iterator iter = multiRequest.getFileNames();
System.out.println("**************");
System.out.println(iter);
while(iter.hasNext()){
//记录上传过程起始时的时间,用来计算上传时间
int pre = (int) System.currentTimeMillis();
//取得上传文件
MultipartFile file = multiRequest.getFile(iter.next());
if(file != null){
//取得当前上传文件的文件名称
String myFileName = 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(myFileName.trim() !=""){
System.out.println("111111111111111");
System.out.println(myFileName);
//重命名上传后的文件名
String fileName = "demoUpload" + file.getOriginalFilename();
String path = "F:/" + fileName;
File localFile = new File(path);
file.transferTo(localFile);
}
}
//记录上传该文件后的时间
int finaltime = (int) System.currentTimeMillis();
System.out.println(finaltime - pre);
}
}
return json;
}
这个是什么原因呢 求解决办法