本节内容包含SpringBoot的开发环境配置以及第一个HelloWorld

准备环境：jdk1.8 + maven3.3.9 + eclipse

1. 新建Maven项目

2. 修改pom.xml文件

引入父类包以及spring-web的依赖包

  <!--引用 springboot-parent，实现了很多jar依赖管理--><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.RELEASE</version></parent><dependencies><!--由于sprintboot默认引用了springmvc，所以这里只需要引用spring-web--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies>

3. 在src/main/java目录下创建controller包，以及TestController文件

TestController.java文件内容如下：

packagecom.king.controller;importorg.springframework.boot.SpringApplication;importorg.springframework.boot.autoconfigure.EnableAutoConfiguration;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.bind.annotation.RestController;@RestController
@EnableAutoConfigurationpublic classTestController {@RequestMapping("/hello")publicString hello(){return "Hello world!";}public static voidmain(String[] args) {SpringApplication.run(TestController.class, args);}}

4. 在TestController中右键run as Java Application

然后在控制台中看到如下信息：

.   ____          _            __ _ _/\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ |'_| | '_ \/ _` | \ \ \ \\\/  ___)| |_)| | | | | || (_| |) ) ) )'|____| .__|_| |_|_| |_\__, | / / / /=========|_|==============|___/=/_/_/_/:: Spring Boot ::        (v1.5.9.RELEASE)2018-01-28 22:45:03.463  INFO 171392 --- [           main] com.king.controller.TestController       : Starting TestController on KingWang with PID 171392(D:\workspace\workspace_j2ee\springboot\target\classes started by Administrator in D:\workspace\workspace_j2ee\springboot)2018-01-28 22:45:03.467  INFO 171392 --- [           main] com.king.controller.TestController       : No active profile set, falling back to default profiles: default
2018-01-28 22:45:03.542  INFO 171392 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5e955596: startup date [Sun Jan 28 22:45:03 CST 2018]; root of context hierarchy2018-01-28 22:45:06.660  INFO 171392 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080(http)2018-01-28 22:45:06.684  INFO 171392 ---[           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]2018-01-28 22:45:06.690  INFO 171392 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.23
2018-01-28 22:45:06.919  INFO 171392 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext2018-01-28 22:45:06.920  INFO 171392 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 3383ms2018-01-28 22:45:07.296  INFO 171392 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]2018-01-28 22:45:07.303  INFO 171392 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-01-28 22:45:07.307  INFO 171392 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-01-28 22:45:07.314  INFO 171392 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-01-28 22:45:07.315  INFO 171392 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-01-28 22:45:08.056  INFO 171392 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5e955596: startup date [Sun Jan 28 22:45:03 CST 2018]; root of context hierarchy
2018-01-28 22:45:08.189  INFO 171392 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.king.controller.TestController.hello()
2018-01-28 22:45:08.199  INFO 171392 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-01-28 22:45:08.199  INFO 171392 --- [           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)
2018-01-28 22:45:08.250  INFO 171392 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-01-28 22:45:08.250  INFO 171392 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-01-28 22:45:08.325  INFO 171392 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-01-28 22:45:08.849  INFO 171392 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans forJMX exposure on startup2018-01-28 22:45:09.071  INFO 171392 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080(http)2018-01-28 22:45:09.079  INFO 171392 --- [           main] com.king.controller.TestController       : Started TestController in 6.343 seconds (JVM running for 7.083)

5. 在浏览器中输入http://localhost:8080/hello即可

到此，一个简单的springboot项目完成。。。

使用springboot开开发java项目居然如此简单，

省去了ssm中的那些繁琐的xml配置。

内置了tomcat服务器，

直接生成一个可执行的jar文件，

所以我们直接通过run命令即可执行。

好了，夸奖springboot到此。