java - Spring Controller 被调用但返回 404

Question

我正在编写一个 Spring Boot 应用程序。我已经编写了一个简单的 Controller ，它会在端点被命中时被调用，但它仍然返回状态 404 而不是指定的返回值。

HelloController

@Controller
public class MessageRequestController {

    @RequestMapping(method = RequestMethod.GET, value = "/hello", produces = "application/json")
    public String hello() {
        System.out.println("Hit me!");
        return "Hello, you!";
    }
}

现在每当我调用 localhost:8080/hello 时，我都会看到控制台日志 "Hit me!"，但 "Hello, you!" code> 永远不会返回。 postman 输出:

{
    "timestamp": 1516953147719,
    "status": 404,
    "error": "Not Found",
    "message": "No message available",
    "path": "/hello"
}

Application.java

@SpringBootApplication
@ComponentScan({"com.sergialmar.wschat"}) // this is the root package of everything
@EntityScan("com.sergialmar.wschat")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 1

更改您的方法返回 ResponseEntity<T>

@RequestMapping(method = RequestMethod.GET, value = "/hello", produces = "application/json")
    public ResponseEntity<String> hello() {
        System.out.println("Hit me!");
        return new ResponseEntity<String>("Hello, you!", HttpStatus.OK);
    }

或将 Controller 更改为 RestController

@RestController
public class MessageRequestController {...}

curl

ubuntu:~$ curl -X GET localhost:8080/hello
Hello, you!