layui实现form表单同时提交数据和文件的代码

<%--用户注册的弹出框--%>
<div id="userDiv" style="display: none;">
 <form class="layui-form" id="userForm" lay-filter="deptForm" enctype="mutipart/form-data">
  <input type="hidden" name="id">
  <div class="layui-form-item">
   <div class="layui-inline">
    <label class="layui-form-label" >用户名</label>
    <div class="layui-input-inline">
     <input type="text" name="name" placeholder="6~18位，请使用数字或字母" lay-verify="checkName|username|required" class="layui-input">
    </div>
   </div>
   <div class="layui-inline">
    <label class="layui-form-label">密码</label>
    <div class="layui-input-inline">
     <input type="password" id="password" name="password" lay-verify="required" class="layui-input">
    </div>
   </div>
   <div class="layui-inline">
    <label class="layui-form-label">确认密码</label>
    <div class="layui-input-inline">
     <input type="password" lay-verify="required|checkPwd" class="layui-input">
    </div>
   </div>
   <%--图片上传功能--%>
   <div>
    <button type="button" name="url" class="layui-btn" id="test1">上传头像</button>
     <img class="layui-upload-img" id="photo" width="100" height="100">
     <p id="demoText"></p>
   </div>
   <hr/>
   <div class="layui-form-item" id="btn">
    <div class="layui-input-block">
     <button id="get" lay-filter="reg" class="layui-btn btn-submit" type="button" lay-submit="">立即注册</button>
     <button type="reset" class="layui-btn layui-btn-primary">重置</button>
    </div>
   </div>
  </div>
 </form>
</div>

//上传头像的方法
  var uploadInst = upload.render({
   elem: '#test1'  /根据绑定id，打开本地图片/
   ,url: '/reg' /上传后台接受接口/
   ,auto: false  /true为选中图片直接提交，false为不提交根据bindAction属性上的id提交/
   ,bindAction: '#get'
   ,drag:true
   ,auto: false
   ,choose:function(obj){
    //预读本地文件示例，不支持ie8
    obj.preview(function(index, file, result){
     $('#photo').attr('src', result); //图片链接（base64）
    });
   }
   ,done: function(res){
    //如果上传失败
    if(res.code > 0){
     return layer.msg('上传失败');
    }
    //上传成功
   }
   ,error: function(){
    //演示失败状态，并实现重传
    var demoText = $('#demoText');
    demoText.html('<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-mini demo-reload">重试</a>');
    demoText.find('.demo-reload').on('click', function(){
     uploadInst.upload();
    });
   }
  });
 //提交表单的方法
 form.on('submit(reg)', function (data) {
   var fd = new FormData();
   var formData = new FormData($( "#userForm" )[0]);
   $.ajax({
    cache : true,
    type : "post",
    url : "/reg",
    async : false,
    data : formData, // 你的formid
    contentType: false, //jax 中 contentType 设置为 false 是为了避免 JQuery 对其操作，从而失去分界符，而使服务器不能正常解析文件
    processData: false, //当设置为true的时候,jquery ajax 提交的时候不会序列化 data，而是直接使用data
    error : function(request) {
     layer.alert('操作失败', {
      icon: 2,
      title:"提示"
     });
    },
    suess : function(ret) {
     if (ret.suess) {
      layer.alert('注册成功', {
       icon: 2,
       title:"提示"
      });
      layer.closeAll();
      window.location.href="/login" rel="external nofollow" ;
     } else {
      layer.alert(ret.msg, {
       icon: 2,
       title:"提示"
      });
     }
    }
    })
  });

@ResponseBody
 @RequestMapping ("/reg")
 public JsonResult save(MultipartFile file, User user, HttpServletRequest request){
  try {
   String path = request.getSession().getServletContext().getRealPath("upload");
   String pathPhoto = "/upload";
   if(!file.isEmpty()){
    String name = file.getOriginalFilename();//获取接受到的图片名称
    String newFileName = UUID.randomUUID().toString().substring(0,5)+"."+ FilenameUtils.getExtension(name);
    File fi = new File(path,newFileName);  //将path路径与图片名称联系在一起
    if(!fi.getParentFile().exists()){ //判断是否存在path路径下的文件夹
     fi.getParentFile().mkdirs();  //不存在创建path路径下的文件夹
    }
    file.transferTo(fi);      //上传图片
    user.setImgurl(pathPhoto+"/"+newFileName); //为保存图片路径
   }
   if(!StringUtil.isEmpty(user.getName()) && !StringUtil.isEmpty(user.getPassword())){
    userService.save(user);
   }
  } catch (Exception e) {
   e.printStackTrace();
   return new JsonResult(false,e.getMessage());
  }
  return new JsonResult();
 }