如何使用Spring Boot从POST方法返回对象？

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

    // 构造函数、getter和setter方法
    public User() {}

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // getter和setter...
}

import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api")
public class UserController {

    @PostMapping("/user")
    public User createUser(@RequestBody User user) {
        // 这里可以进行一些业务逻辑处理，然后返回User对象
        return user;
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
                .allowedHeaders("*")
                .allowCredentials(true);
    }
}

curl -X POST http://localhost:8080/api/user \
-H "Content-Type: application/json" \
-d '{"name":"John Doe","age":30}'

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