快速的用springboot 搭建一个web工程
以前我们在使用spring框架搭建一个web项目的时候，首先要建一个maven工程，然后又添加pom.xml的配置文件。
在pom文件中增加对相关的的依赖，然后新建Spring相关的xml文件，而且往往那些xml文件还会少。然后继续使用
tomcat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。
如果我们使用springboot的话就很快能够做到上述的操作。下面就来看看具体的操作：
1. 我们创建一个Maven工程，工程名字为spring-boot-helloworld，然后修改pom.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<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>net.mingyang</groupId>
<artifactId>spring-boot-helloworld</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-boot-helloworld</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.7</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2. 新建一个Controller来接受处理我们的请求：
package net.mingyang.spring_boot_helloworld;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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;
@SpringBootApplication
@Controller
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);
}
}
3. 执行SimleController中的main()方法：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.4.1.RELEASE)
2016-10-18 08:43:46.946 INFO 4640 --- [ main] n.m.s.SimpleController : Starting SimpleController on D60601653 with PID 4640 (X:\dev\spring-test-suite\spring-boot-helloworld\target\classes started by lbin in X:\dev\spring-test-suite\spring-boot-helloworld)
2016-10-18 08:43:46.950 INFO 4640 --- [ main] n.m.s.SimpleController : No active profile set, falling back to default profiles: default
2016-10-18 08:43:47.238 INFO 4640 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@69cc1627: startup date [Tue Oct 18 08:43:47 CST 2016]; root of context hierarchy
2016-10-18 08:43:49.969 INFO 4640 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2016-10-18 08:43:49.983 INFO 4640 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2016-10-18 08:43:49.984 INFO 4640 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.5
2016-10-18 08:43:50.108 INFO 4640 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2016-10-18 08:43:50.109 INFO 4640 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2874 ms
2016-10-18 08:43:50.334 INFO 4640 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2016-10-18 08:43:50.340 INFO 4640 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2016-10-18 08:43:50.340 INFO 4640 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2016-10-18 08:43:50.340 INFO 4640 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2016-10-18 08:43:50.340 INFO 4640 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2016-10-18 08:43:50.766 INFO 4640 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@69cc1627: startup date [Tue Oct 18 08:43:47 CST 2016]; root of context hierarchy
2016-10-18 08:43:50.863 INFO 4640 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello],methods=[GET]}" onto public java.lang.String net.mingyang.spring_boot_helloworld.SimpleController.hello()
2016-10-18 08:43:50.868 INFO 4640 --- [ 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)
2016-10-18 08:43:50.868 INFO 4640 --- [ 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)
2016-10-18 08:43:50.912 INFO 4640 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-10-18 08:43:50.912 INFO 4640 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-10-18 08:43:51.029 INFO 4640 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-10-18 08:43:51.767 INFO 4640 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2016-10-18 08:43:51.878 INFO 4640 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2016-10-18 08:43:51.884 INFO 4640 --- [ main] n.m.s.SimpleController : Started SimpleController in 5.658 seconds (JVM running for 5.99)
查看日志可以发现她默认使用的是tomcat，端口绑定在8080，所以我们也就没有必要去配置头mcat。直接运行就可以。我们在访问：http://localhost:8080/hello，就可以看到我们代码中输出的字样了。
