springboot简化之前的很多xml文件，不需要大量配置xml文件，没有很多xml文件是多么的愉快
下面进入正题，演示简单的入门程序，虽然简单，但足以振奋初学者们
我新建的工程名叫hello，大家可以参考
一、建立一个war工程，导入正确的依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springboot.demo</groupId>
<artifactId>hello</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
二、建包建java文件
package com.example; 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.ResponseBody; @Controller @EnableAutoConfiguration public class HelloController { @RequestMapping("/hello") @ResponseBody String home() { return "Hello,spring boot!"; } public static void main(String[] args) { SpringApplication.run(HelloController.class, args); } }
三、在HelloController里面执行main方法
出现如下图所示，表示启动成功
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.3.4.RELEASE)
2017-12-24 18:45:26.059 INFO 13340 --- [ main] com.example.HelloController : Starting HelloController on LAPTOP-AP8KJEQL with PID 13340 (E:\Demo\workspace\hello\target\classes started by eluzhu in E:\Demo\workspace\hello)
2017-12-24 18:45:26.061 INFO 13340 --- [ main] com.example.HelloController : No active profile set, falling back to default profiles: default
2017-12-24 18:45:26.086 INFO 13340 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@24b1d79b: startup date [Sun Dec 24 18:45:26 CST 2017]; root of context hierarchy
2017-12-24 18:45:27.110 INFO 13340 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-12-24 18:45:27.121 INFO 13340 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2017-12-24 18:45:27.122 INFO 13340 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.33
2017-12-24 18:45:27.241 INFO 13340 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-12-24 18:45:27.242 INFO 13340 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1158 ms
2017-12-24 18:45:27.486 INFO 13340 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-24 18:45:27.490 INFO 13340 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-12-24 18:45:27.490 INFO 13340 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-12-24 18:45:27.490 INFO 13340 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-12-24 18:45:27.490 INFO 13340 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-12-24 18:45:27.679 INFO 13340 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@24b1d79b: startup date [Sun Dec 24 18:45:26 CST 2017]; root of context hierarchy
2017-12-24 18:45:27.728 INFO 13340 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto java.lang.String com.example.HelloController.home()
2017-12-24 18:45:27.731 INFO 13340 --- [ 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)
2017-12-24 18:45:27.731 INFO 13340 --- [ 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)
2017-12-24 18:45:27.751 INFO 13340 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-24 18:45:27.751 INFO 13340 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-24 18:45:27.775 INFO 13340 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-24 18:45:27.839 INFO 13340 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-12-24 18:45:27.901 INFO 13340 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-12-24 18:45:27.904 INFO 13340 --- [ main] com.example.HelloController : Started HelloController in 2.094 seconds (JVM running for 2.468)
四、第三步执行成功后，在浏览器输入localhost:8080/hello就可以看到hello,springboot这句话了，就表示入门程序成功了
最后说明：springboot远远不止这么点功能，还有很多了，一起探索吧
