上传图片后台接受，while进不去

@RequestMapping("/uploader")  
   public Map<String, Object> uploader(HttpServletRequest request) {   
       Map<String, Object> map = new HashMap<String, Object>();  
       try {  
           if(request.getHeader("content-type")!=null&&"application/x-www-form-urlencoded".equals(request.getHeader("content-type"))){  
               return null;//不支持断点续传，直接返回null即可  
           }  
    //将请求转换成  
           MultipartHttpServletRequest mRequest=(MultipartHttpServletRequest)request;  
           System.out.println("mre:"+mRequest);  
           Enumeration<String> ps = mRequest.getParameterNames();  
           while(ps.hasMoreElements()){  
               String hname = ps.nextElement();  
               System.out.println("hname--"+hname);  
               System.out.println("mRequest.getParameter(hname)---"+mRequest.getParameter(hname));  
           }  
           int eventType=0;  
           int reportSource=0;  
           double  longitude=0;  
           double latitude=0;  
           if(mRequest.getParameter("eventType")!=null&&!"".equals(mRequest.getParameter("eventType").trim()))  
               eventType= Integer.parseInt(mRequest.getParameter("eventType"));  
           if(mRequest.getParameter("reportSource")!=null&&!"".equals(mRequest.getParameter("reportSource").trim()))  
               reportSource= Integer.parseInt(mRequest.getParameter("reportSource"));  
           String reporter= mRequest.getParameter("reporter");  
           String phone= mRequest.getParameter("phone");  
           String title= mRequest.getParameter("title");  
           String description= mRequest.getParameter("description");  
           if(mRequest.getParameter("longitude")!=null&&!"".equals(mRequest.getParameter("longitude").trim()))  
               longitude= Double.parseDouble(mRequest.getParameter("longitude"));  
           if(mRequest.getParameter("latitude")!=null&&!"".equals(mRequest.getParameter("latitude").trim()))  
               latitude= Double.parseDouble(mRequest.getParameter("latitude"));  

           Iterator<String> fns=mRequest.getFileNames();//获取上传的文件列表  
           System.out.println("fns--"+fns.hasNext());  

           while(fns.hasNext()){  
               String s =fns.next();  
                         System.out.println("输出=="+s+"==="+mRequest.getFile(s));  
                         System.out.println(mRequest.getFile(s));//get file success!!!!!  
               MultipartFile mFile = mRequest.getFile(s);    
               if(mFile.isEmpty()){  
                   map.put("error", "EventAction.picture.failed");  
               }else{  
//                 String basePath=Constant.BASEPICUPLOADPATH;  
//                 String dPath= Constant.SDF_PARAM.format(new Date());  
                   File dir = new File("F:\\file\\path");  
                   if(!dir.exists()){  
                       dir.mkdirs();  
                   }  
                   String originFileName=mFile.getOriginalFilename();  
                   String suffix=originFileName.split("\\.")[originFileName.split("\\.").length-1];  
                   String base64Name=UUID.randomUUID().toString();  
                   File file =  new File("F:\\file\\path",base64Name+"."+suffix);  
                   try {  
                       FileUtils.copyInputStreamToFile(mFile.getInputStream(),file);//存储文件  
                   } catch (IOException e) {  
                       e.printStackTrace();  
                   }    
               }  
           }  
           //System.out.println(mRequest.getFileNames());  
           map.put("result", "OK");//返回结果  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  

       return map;  
   }  

请各位朋友棒棒忙！