如何让POST请求接受以下格式的JSON有效负载？我要用Jackson来做这个手术

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.5</version>
</dependency>

{
  "name": "John",
  "age": 30
}

public class User {
    private String name;
    private int age;

    // 省略构造函数、getter和setter方法
}

import com.fasterxml.jackson.databind.ObjectMapper;

@RestController
public class UserController {

    @PostMapping("/user")
    public void createUser(@RequestBody String payload) {
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            User user = objectMapper.readValue(payload, User.class);
            // 对接收到的User对象进行处理
        } catch (IOException e) {
            // 处理JSON解析异常
        }
    }
}