SpringMVC @RequestParam和@RequestBody的区别

问题:@Requestbody 用的时候遇到400和415错误，因为请求格式不对。

@RequestBody

@RequestBody能把简单json结构参数转换成实体类，如下代码：

    @RequestMapping(value = "/testUser", method = RequestMethod.POST)
    public String testUser(@RequestBody User user){
        System.out.print(user.getAge());
        return "success";
    }

参数为：

{"id":1,"user":"pkxutao","name":"name","age":18}

注意请求的content type要设置为application/json

$.ajax({
         type:"POST",
         url : "adjectfkController/exportTemplate",
         cache:false,
         async:true,
         dataType:"json",  
         contentType : 'application/json;charset=utf-8', //设置请求头信息  
         data:jsonstr,
         success : function(result) {
                console.log(result);
            },
        error : function(result) {
                console.log("错误-----------------------------");
            }
    });

学习链接:https://blog.csdn.net/qq_27093465/article/details/50519444