工具：Eclipse、jdk1.8、maven；一：先建一个maven的项目
然后再pom文件中添加相关依赖和配置，具体如下：org.springframework.boot spring-boot-starter-parent 1.4.1.RELEASE UTF-8 1.8 注意添加依赖后，记得update； org.springframework.boot spring-boot-starter-web
然后创建HelloController，code如下：import java.util.Date;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class HelloController { @RequestMapping("/hello") public String hello(){ return "hello"; }} 然后编码springboot启动类App.java
@SpringBootApplicationpublic class App// extends WebMvcConfigurerAdapter { public static void main( String[] args ) { System.out.println( "--------------开始启动---------------!" ); SpringApplication.run(App.class, args); System.out.println( "--------------启动成功---------------!" ); }} 打开app.java,右键run as java application启动springboot应用；
--------------开始启动---------------! . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.4.1.RELEASE)2019-05-27 15:27:52.942 INFO 2020 --- [ main] com.feiyun.springboot_hello.App : Starting App on TEST-PC with PID 2020 (E:\Eclise\MyWorkPlace\springboot-hello\target\classes started by Administrator in E:\Eclise\MyWorkPlace\springboot-hello)2019-05-27 15:27:52.944 INFO 2020 --- [ main] com.feiyun.springboot_hello.App : No active profile set, falling back to default profiles: default2019-05-27 15:27:52.985 INFO 2020 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4b0b0854: startup date [Mon May 27 15:27:52 CST 2019]; root of context hierarchy2019-05-27 15:27:54.084 INFO 2020 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2019-05-27 15:27:54.097 INFO 2020 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat2019-05-27 15:27:54.099 INFO 2020 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.52019-05-27 15:27:54.180 INFO 2020 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2019-05-27 15:27:54.180 INFO 2020 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1198 ms2019-05-27 15:27:54.327 INFO 2020 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]2019-05-27 15:27:54.331 INFO 2020 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]2019-05-27 15:27:54.331 INFO 2020 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2019-05-27 15:27:54.331 INFO 2020 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]2019-05-27 15:27:54.332 INFO 2020 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]2019-05-27 15:27:54.592 INFO 2020 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4b0b0854: startup date [Mon May 27 15:27:52 CST 2019]; root of context hierarchy2019-05-27 15:27:54.647 INFO 2020 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.feiyun.springboot_hello.HelloController.hello()2019-05-27 15:27:54.648 INFO 2020 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/getDemo]}" onto public com.feiyun.springboot_hello.Demo com.feiyun.springboot_hello.HelloController.getDemo()2019-05-27 15:27:54.652 INFO 2020 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity > org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)2019-05-27 15:27:54.652 INFO 2020 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)2019-05-27 15:27:54.674 INFO 2020 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2019-05-27 15:27:54.674 INFO 2020 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2019-05-27 15:27:54.706 INFO 2020 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2019-05-27 15:27:54.825 INFO 2020 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup2019-05-27 15:27:54.870 INFO 2020 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2019-05-27 15:27:54.873 INFO 2020 --- [ main] com.feiyun.springboot_hello.App : Started App in 2.258 seconds (JVM running for 2.533)--------------启动成功---------------! 运行成功后，打开浏览器访问hello方法，注意默认端口是8080；
end;
hello