问题描述： 在后台写好一个POST 的controller 的请求，通过PostMan 发送http请求携带json数据时，后台接收的数据为null或者没有接收到。

如后台代码：

    @RequestMapping(method = RequestMethod.POST,value = "/delete")
    public  String testDelete( UserBean userBean){
        loggge.info("this is delete request：getAccount = {},getAuthCode = {}",userBean.getAccount(),userBean.getUsername());
        return  "successful";
    }

使用PostMan发送post请求：http://localhost:8081/springboot/delete

结果:

this is delete request：getAccount = null,getAuthCode = null

解决方式，在@RequestMapping 指定请求头，并添加注解@RequestBody：

    @RequestMapping(method = RequestMethod.POST,value = "/delete",produces = "application/json;charset=UTF-8")
    public  String testDelete(@RequestBody UserBean userBean){
        loggge.info("this is delete request：getAccount = {},getAuthCode = {}",userBean.getAccount(),userBean.getUsername());
        return  "successful";
    }

再请求，结果成功

this is delete request：getAccount = new,getAuthCode = old