java spring mvc hello world类型未找到

Question

这是我的项目:

ProducerController.java:

package mypackage.application;

@Controller
@RequestMapping(value = "/producer")
public class ProducerController {

    @RequestMapping(value="/", method = RequestMethod.GET, produces = "application/json")
    public String info() {
        return "hello";
    }

    @RequestMapping(value="/send", method = RequestMethod.GET, produces = "application/json")
    public Email greeting() {
        return new Email("send@tome.com","hello");
    }
}

Email.java

public class Email {

    private String to;
    private String body;

    public Email(String to, String body) {
        this.to = to;
        this.body = body;
    }
    public String getTo() {
        return to;
    }
    public void setTo(String to) {
        this.to = to;
    }
    public String getBody() {
        return body;
    }
    public void setBody(String body) {
        this.body = body;
    }

}

Application.java

@SpringBootApplication
@ComponentScan(basePackageClasses=ProducerController.class)
public class Application {

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

当我执行 GET 请求时 http://localhost:8080/producer/send或http://localhost:8080/producer/

调用 return 时我返回了此错误消息:

出现意外错误(类型=未找到，状态=404)。

怎么了？非常感谢

Answer 1

使用@RestController代替@Controller

 @RestController  
 @RequestMapping(value = "/producer")
    public class ProducerController {
    ....      
    }

404的HTTP状态码正是合适的未找到资源时的响应状态代码。因为现在 Controller 被注释了使用@RestController，从这些方法返回的对象将通过消息转换，为客户端(浏览器)生成资源表示。