springmvcµÄÎļþÉÏ´«Ó뱸·Ý

public void save(@RequestParam(value = "applicationImage", required = false) MultipartFile file,
   HttpServletResponse response,HttpServletRequest request,Entity entity) throws Exception{
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
  String date=sdf.format(new Date());
  String path = request.getSession().getServletContext()
    .getRealPath("image"+File.separator+date);
  String backupPath="bakimage"+File.separator+date;
  String []postfixs=file.getOriginalFilename().split("\\.");
  String postfix=postfixs[postfixs.length-1];
  String fileName = new Date().getTime()+"."+postfix;
  File targetFile = new File(path, fileName);
  File backupFile = new File(backupPath, fileName);
  File backupFileDir=new File(backupPath);
  if(!backupFileDir.exists()){
   backupFileDir.mkdirs();
  }
  backupFile.createNewFile();
  if (!targetFile.exists()) {
   targetFile.mkdirs();
  }
  try {
   file.transferTo(targetFile);
   File f=new File(path+File.separator+fileName);
   FileUtils.copyFile(f, backupFile);
   entity.setImage(date+File.separator+fileName);
   if("".equals(entity.getId())||entity.getId()==null){
    zealotService.save(entity);
    
   }else{
    zealotService.update(entity);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  WebUtil.print(response, "success");
 }

<!-- springMvcÎļþÉÏ´«µÄÖ§³Ö -->
 <bean id="multipartResolver"
  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  <property name="maxUploadSize" value="1024000000" />
  <property name="resolveLazily" value="true" />
  <property name="maxInMemorySize" value="4096" />
 </bean>