TA的每日心情 | 开心 2021-12-13 21:45 |
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签到天数: 15 天 [LV.4]偶尔看看III
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我想,现在企业级的Java Web项目应该或多或少都会使用到Spring框架的。
回首我们以前使用Spring框架的时候,我们需要首先在(如果你使用Maven的话)pom文件中增加对相关的的依赖(使用gradle来构建的话基本也一样)然后新建Spring相关的xml文件,而且往往那些xml文件还不会少。然后继续使用tomcat或者jetty作为容器来运行这个工程。基本上每次创建一个新的项目都是这么一个流程,而我们有时候仅仅想快速的创建一个Spring web工程来测试一些东西,或者是希望能节省时间。
现在我们使用Spring Boot就可以快速的做到这些了。
我们先来看一个非常简单的使用Spring boot的例子吧:
1. 我们创建一个Maven工程,假定工程名字为spring-boot,然后我们在pom.xml文件中加入依赖:
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- <version>1.0.2.RELEASE</version>
- </dependency>
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2. 新建一个Controller来接受处理我们的请求:
- import org.springframework.boot.SpringApplication;
- import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.bind.annotation.ResponseBody;
- /**
- * Created by wenchao.ren on 2014/4/26.
- */
- @Controller
- @EnableAutoConfiguration
- public class SimpleController {
- @RequestMapping(value ="/hello", method = RequestMethod.GET)
- @ResponseBody
- public String hello(){
- return "hello world";
- }
- public static void main(String[] args) {
- SpringApplication.run(SimpleController.class, args);
- }
- }
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相信大家已经看到了这个Controller有一个main方法,不要急,我们直接运行这个main方法:
- . ____ _ __ _ _
- /\\ / ___"_ __ _ _(_)_ __ __ _ \ \ \ \
- ( ( )\___ | "_ | "_| | "_ \/ _` | \ \ \ \
- \\/ ___)| |_)| | | | | || (_| | ) ) ) )
- " |____| .__|_| |_|_| |_\__, | / / / /
- =========|_|==============|___/=/_/_/_/
- :: Spring Boot :: (v1.0.2.RELEASE)
- 2014-04-26 22:54:40.985 INFO 7236 --- [ main] c.r.spring.boot.SimpleController : Starting SimpleController on rollen with PID 7236 (D:\workspace\GitHub\SpringDemo\spring-boot\target\classes started by wenchao.ren in D:\workspace\GitHub\SpringDemo\spring-boot)
- 2014-04-26 22:54:41.008 INFO 7236 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@50de0926: startup date [Sat Apr 26 22:54:41 CST 2014]; root of context hierarchy
- 2014-04-26 22:54:41.583 INFO 7236 --- [ main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
- 2014-04-26 22:54:41.706 INFO 7236 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
- 2014-04-26 22:54:41.706 INFO 7236 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/7.0.52
- 2014-04-26 22:54:41.785 INFO 7236 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
- 2014-04-26 22:54:41.785 INFO 7236 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 779 ms
- 2014-04-26 22:54:42.055 INFO 7236 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: "dispatcherServlet" to [/]
- 2014-04-26 22:54:42.057 INFO 7236 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: "hiddenHttpMethodFilter" to: [/*]
- 2014-04-26 22:54:42.289 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
- 2014-04-26 22:54:42.368 INFO 7236 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String com.rollenholt.spring.boot.SimpleController.hello()
- 2014-04-26 22:54:42.376 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
- 2014-04-26 22:54:42.377 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
- 2014-04-26 22:54:42.447 INFO 7236 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
- 2014-04-26 22:54:42.459 INFO 7236 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080/http
- 2014-04-26 22:54:42.460 INFO 7236 --- [ main] c.r.spring.boot.SimpleController : Started SimpleController in 1.675 seconds (JVM running for 1.944)
- 2014-04-26 22:54:54.963 INFO 7236 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet "dispatcherServlet"
- 2014-04-26 22:54:54.963 INFO 7236 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet "dispatcherServlet": initialization started
- 2014-04-26 22:54:54.971 INFO 7236 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet "dispatcherServlet": initialization completed in 8 ms
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会产生上面的输出,查看日志可以发现默认使用的是tomcat,端口绑定在8080,现在让我们来访问:http://localhost:8080/hello
就可以看到我们代码中输出的字样:hello world了。
回首这个过程,是不是相比于以前快速了许多呢
参考资料:
1. Spring Boot Reference Guide |
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