Spring boot启动成功但是报404:The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

悬赏园豆：50 [待解决问题]

环境:
　　win10 64bit
　　安装的JDK 1.6 32bit
　　绿色版JDK 1.8 64bit
　　STS 3.8.4.RELEASE/3.9，STS都是使用的JDK是1.8(启动和运行)
　　spring boot version：1.5.7
　　hosts:

　　# localhost name resolution is handled within DNS itself.

　　# 127.0.0.1 localhost
　　# ::1 localhost
　　172.20.207.252 s1
　　172.20.207.252 s2
　　172.20.207.252 s3
　　172.20.207.252 s4
　　172.20.207.252 s5

DemoApplication.java

package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
//@RestController
@SpringBootApplication
public class DemoApplication {
　　public static void main(String[] args) {
　　　　SpringApplication.run(DemoApplication.class, args);
　　}
}

TestController.java

package com.example.demo.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
　　@RequestMapping("/hello")
　　public String sayHi(){
　　　　return "hello";
　　}
}

application.properties

#server.port=1001
#server.context-path=/test

工程文件目录截图：

启动日志:

[           main] com.example.demo.DemoApplication         : Starting DemoApplication on YIXIUQUAN-PC with PID 7596 (D:\WorkSpace\STS_workspace_3.9\demo\target\classes started by yxq in D:\WorkSpace\STS_workspace_3.9\demo)
[           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
[           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@71623278: startup date [Mon Sep 25 10:19:16 CST 2017]; root of context hierarchy
[           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
[           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
[           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.20
[ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
[ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 961 ms
[ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
[           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
[           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
[           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.565 seconds (JVM running for 2.194)