Spring启动应用程序未在Tomcat中配置的端口号启动

我在spring工具套件工具中运行示例spring boot应用程序 . 配置端口后，我无法从浏览器启动应用程序 . 我收到404 Not found错误 . Spring启动在tomcat上正常运行 .

application.properties

hello.greeting =很高兴见到你

server.port = 9874

有人可以帮我纠正这个问题 .

package demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class HelloBootApplication {

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


package demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Autowired
    HelloProperties props;

    @RequestMapping("/hello")
    public String hello(@RequestParam String name) {
        return props.getGreeting()+name;
    }

}

package demo;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties("hello")
public class HelloProperties {
    private String greeting = "Welcome ";

    public String getGreeting() {
        return greeting;
    }

    public void setGreeting(String greeting) {
        this.greeting = greeting;
    }
}

2018-07-22 17:17:32.798  INFO 11824 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-22 17:17:32.952  INFO 11824 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-07-22 17:17:33.000  INFO 11824 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 9874 (http) with context path ''
2018-07-22 17:17:33.006  INFO 11824 --- [           main] demo.HelloBootApplication                : Started HelloBootApplication in 2.083 seconds (JVM running for 2.862)

这是 Spring 季启动应用程序，在下面的链接上找到404 Not Found http://localhost:9874/