springMVC在使用ajax进行后台传值的时候发现找不到对应的requestMapping(""),无法进入后台，在多次试验后确定是

MultipartFile对象与ajax冲突；并且不报任何异常，直接调用ajax的失败属性方法处理；
代码如下：

·1 @RequestMapping("/addimage")
 2     public String  addimage(@RequestParam("image")MultipartFile file,HttpServletRequest request){
 3         
 4         PersonMsgService.setEntityClass(Personalmsg.class);
 5         Personalmsg bean=(Personalmsg) PersonMsgService.get(getInt(request, "personMsgID"));
 6         
 7         String fileName =getInt(request, "personMsgID")+".JPG";
 8         System.out.println(fileName);
 9         
10         String path = request.getSession().getServletContext().getRealPath("upload");
11         System.out.println(path);
12         File targetFile = new File(path,fileName);
13         if(!targetFile.exists()){
14             targetFile.mkdirs();
15         }
16         try {
17             file.transferTo(targetFile);
18             bean.setImage(path+"\\"+fileName);
19             System.out.println(bean);
20             PersonMsgService.saveOrUpdate(bean);
21         } catch (IllegalStateException e) {
22             e.printStackTrace();
23         } catch (IOException e) {
24             e.printStackTrace();
25         }
26         return "redirect:/test/PersonMsg/tolist.spring";
27     }