MySQL+SSM+Ajax上传图片问题

function postImg(){
 if ($.trim($("#imgFile").val()) == "") { 
   alert("请选择图片！"); 
   return; 
  } 
 console.log($("#imgFile")[0].files[0].size);//小于100*1024，下面的请求就可以成功
 var option = {
  url : '/cloudnote/user/insertUserPhoto.do',
  type : 'POST',
//  dataType : 'json',
  headers : {"ClientCallMode" : "ajax"}, //添加请求头部
  success : function(XMLHttpRequest, textStatus, errorThrown){
   console.log(XMLHttpRequest);
   console.log(textStatus);
   console.log(errorThrown);
   console.log("前端输出上传成功");
   $("#imgClose").click();
  },
  error: function(XMLHttpRequest, textStatus, errorThrown) {
   console.log(XMLHttpRequest);
   console.log(textStatus);
   console.log(errorThrown);
   console.log("前端输出上传失败"); 
  }
 };
 $("#imgForm").ajaxSubmit(option);
 return false; 
}

 
　　

 　　

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//更新用户头像
 @RequestMapping(value="/insertUserPhoto.do",method = RequestMethod.POST)
 public void insertUserPhoto(
   HttpServletRequest req, HttpServletResponse res){
  System.out.println("----- 插入图片 -------");
  try{
   String id = req.getParameter("userId"); 
   System.out.println(id);
   MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) req;
   MultipartFile file = multipartRequest.getFile("imgFile");
   byte[] photo = file.getBytes();
   boolean result = serv.insertUserPhoto(id, photo); 
   res.setContentType("text/html;charset=utf8"); 
   res.getWriter().write("result:" + result);   
  }catch(Exception e){
   e.printStackTrace();
  }
  System.out.println("----- 插入图片end -------");
 }
 /**
  * 读取用户头像
  * @param req
  * @param res
  */
 @RequestMapping(value="/readPhoto.do", method=RequestMethod.GET)
 public void readPhoto(HttpServletRequest req, HttpServletResponse res){
  System.out.println("------readPohto-----");
  String id = Utils.getSessionUserId(req);
  try {
   User user = serv.selectUserPhoto(id);
   res.setContentType("image/jpeg");
   res.setCharacterEncoding("utf-8"); 
   OutputStream outputStream = res.getOutputStream(); 
   InputStream in = new ByteArrayInputStream(user.getPhoto()); 
   int len = 0; 
   byte[] buf = new byte[1024]; 
   while((len = in.read(buf,0,1024)) != -1){ 
    outputStream.write(buf, 0, len);
   } 
   outputStream.close(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
  System.out.println("-----readPohto end-----");
  return;
 }

//查找用户图片（头像）
 public User selectUserPhoto(String id) throws ImageException {
  User user = userDao.findUserById(id);
  if(user == null){
   throw new UserNameException("用户名不存在!");
  }
  Map data = userDao.selectUserPhoto(id);
  System.out.println(data);
  user.setPhoto((byte[]) data.get("photo"));
  return user;
 }
 //更新用户图片（头像）
 public boolean insertUserPhoto(String userId, byte[] photo) throws ImageException, UserNameException {
  if(userId == null || userId.trim().isEmpty()){
   throw new UserNameException("用户id不存在");
  }
  User user = userDao.findUserById(userId);
  if(user == null){
   throw new UserNameException("用户不存在");
  }
  user.setPhoto(photo);
  int n = userDao.updateUserPhoto(user);
  System.out.println("插入图片：" + n);
  return n==1&＃63;true:false; 
 }

  
  UPDATE user set id = #{id}, photo = #{photo,jdbcType=BLOB}  
  WHERE id = #{id}
  
 
  
   SELECT id as id, photo as photo from user 
   WHERE id=#{id} 
 

  
  
  100000 
  UTF-8