springboot控制层传递参数为非必填值的操作

@RestController
@RequestMapping("postman")
public class controllerTest {
    /*
            localhost:8080/postman/***
     */
    @PostMapping("{id}")
    public void testPost(@PathVariable("id") Long id){
        System.out.println("接收到的参数"+id);
    }
}

   /*
            localhost:8080/postman?id=1234
     */
    @GetMapping
    public void testPost2(@RequestParam("id") Long id){
        System.out.println("接收到的参数"+id);//接收到的参数1234
    }

@PostMapping
public void testPost3(Person person){
   System.out.println("接收到的参数"+person);//接收到的参数Person(name=笑烂脸, age=23, sex=男)
}

@PostMapping
public void testPost4(@RequestBody Person person){前后端分离的项目，前端传递的数据都是json对象，所以后台想要接受对应的数据，必须要加@RequestBody注解，否则接收不了
    System.out.println("接收到的参数"+person);//接收到的参数Person(name=笑烂脸, age=23, sex=男)
}