html表单c 后台如何接受,前台提交整个表单数据，后台实体类接收

function su() {

var formData=$("#form").serializeObject(); //这个把表单按对象类型序列化

$.ajax({

url: '/echarge/discount/SaveOrUpdate',

type: "POST",

dataType: "json",

contentType: 'application/json',

data:JSON.stringify(formData),

success: function (res) {

console.log(res)

if(res.code==0){

$("input").attr('disabled','disabled');

alert('已生效');

}else{

alert("操作失败")

}

},

})

}

后台：

@RequestMapping("/SaveOrUpdate")

@ResponseBody //这里用实体类接收

public MapSaveOrUpdate(@RequestBody Discount discount, HttpServletRequest request, HttpSession session) {

Mapmap=new HashMap<>();

try {

int c = -1;

discount.setFlag("1");

c = discountService.saveOrUpdate(discount);

if (c > 0) {

map.put("code",0);

map.put("id", CommonMap.map.get("RID"));

}

} catch (Exception e) {

e.printStackTrace();

map.put("code",1);

}

return map;

}