Spring Boot的使用(一) HelloWorld

    前段时间在spring的官网上看到了spring boot这个工程，感觉挺好的，能够最大化的减少基于Spring web应用的开发，可以将项目打成独立的jar，然后再使用，从文档上看，目前支持Maven和Groovy 。于是就跟着文档写了下代码，还是熟悉的HelloWorld，采用maven来构建。

    首先是创建个maven工程，对应的pom.xml如下：

   

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.jacksoft</groupId>
  <artifactId>iSpring-test</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>iSpring-test Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  
  <parent>
	    <groupId>org.springframework.boot</groupId>
	    <artifactId>spring-boot-starter-parent</artifactId>
	    <version>1.0.0.RC3</version>
  </parent>
  <dependencies>
  	<!-- spring jar start -->
  		<dependency>
	        <groupId>org.springframework.boot</groupId>
	        <artifactId>spring-boot-starter-web</artifactId>
	    </dependency>
  		
  	<!-- spring jar end -->
  
  
  </dependencies>
  <build>
    <finalName>iSpring-test</finalName>
  </build>
  
  <repositories>
  	<repository>
            <id>spring-snapshots</id>
            <url>http://repo.spring.io/snapshot</url>
            <snapshots><enabled>true</enabled></snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <url>http://repo.spring.io/milestone</url>
            <snapshots><enabled>true</enabled></snapshots>
        </repository>
	  	<repository>
	  		<id>repository.hibernate</id>
	  		<name>jar</name>
	  		<url>http://mirrors.ibiblio.org/maven2</url>
	  	</repository>
  </repositories>
  <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <url>http://repo.spring.io/snapshot</url>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <url>http://repo.spring.io/milestone</url>
        </pluginRepository>
    </pluginRepositories>
  
</project>

     需要将工程的parent设置为spring-boot-starter-parent，同时添加依赖spring-boot-starter-web，这样就基本可以了，接下来就是写个controller来试试：

 

package com.jacksoft.spring.controller;

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;

@Controller
@EnableAutoConfiguration
public class HelloController {

	@RequestMapping(value="hello.do",method=RequestMethod.GET)
	@ResponseBody
	public String index(){
		return "Hello,World!!!";
	}
	
}

 

    很简单，就是返回Hello Wolrd字符，然后再写启动类，通过main方法来启动：

 

package com.jacksoft.spring.bootstrap;

import org.springframework.boot.SpringApplication;

import com.jacksoft.spring.controller.HelloController;

public class Bootstrap {
	
	public static void main(String[] args) {
		Object[] source = new Object[]{HelloController.class};
		SpringApplication.run(source, args);
	}
}

   使用SpringApplication来启动容器，spring已经为我们集成了tomcat容器，当然也可以使用Jetty服务器

    运行这个main函数，看控制台的信息:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::            (v1.0.0.RC3)

2014-02-21 11:24:31.995  INFO 4608 --- [           main] com.jacksoft.spring.bootstrap.Bootstrap  : Starting Bootstrap on Jack-PC with PID 4608 (E:\MyWorkSpaces\myspace\two\iSpring-test\target\classes started by Jack)
2014-02-21 11:24:32.046  INFO 4608 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1d332b: startup date [Fri Feb 21 11:24:32 CST 2014]; root of context hierarchy
2014-02-21 11:24:33.185  INFO 4608 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
2014-02-21 11:24:33.412  INFO 4608 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2014-02-21 11:24:33.413  INFO 4608 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/7.0.47
2014-02-21 11:24:33.571  INFO 4608 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2014-02-21 11:24:33.572  INFO 4608 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1528 ms
2014-02-21 11:24:34.446  INFO 4608 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-02-21 11:24:34.533  INFO 4608 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello.do],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String com.jacksoft.spring.controller.HelloController.index()
2014-02-21 11:24:34.561  INFO 4608 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-02-21 11:24:34.562  INFO 4608 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-02-21 11:24:34.724  INFO 4608 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2014-02-21 11:24:34.754  INFO 4608 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port: 8080
2014-02-21 11:24:34.756  INFO 4608 --- [           main] com.jacksoft.spring.bootstrap.Bootstrap  : Started Bootstrap in 3.221 seconds (JVM running for 3.634)

   

   可以看到项目部署的一些基本信息，如端口，访问路径，容器啥的，最后就是在浏览器里面访问了

   访问地址：http://localhost:8080/hello.do

  就可以看到返回的helloworld了。

  到此，一个简单的例子就算完成了，

参考文档：http://projects.spring.io/spring-boot/

http://projects.spring.io/spring-boot/docs/README.html