官方文档html
Spring Boot是为了简化Spring应用的建立、运行、调试、部署等而出现的，使用它能够作到专一于Spring应用的开发，而无需过多关注XML的配置。java
简单来讲，它提供了一堆依赖打包，并已经按照使用习惯解决了依赖问题---习惯大于约定。git
Spring Boot默认使用tomcat做为服务器，使用logback提供日志记录。github
Spring Boot提供了一系列的依赖包，因此须要构建工具的支持：maven 或 gradleweb
Spring Boot 预约义了一些应用启动器：具体能够见博客Spring Boot的启动器Starter详解spring
Featuresapache
以官网quick start 为例（maven）：tomcat
pom中parent设为 spring-boot-starter-parent 。建议使用最新的 RELEASE 版本springboot
添加应用须要的starter模块，做为示例，咱们仅添加web starter应用启动器。web starter应用启动器包含了一系列依赖包组合，如spring-web,spring-webmvc,tomcat-embed-,jackson,spring-,spring-boot-autoconfigure。服务器
pom.xml
<?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>cn.ifengkou</groupId>
<artifactId>spring-boot-test</artifactId>
<version>1.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
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;
/**
* 描述
*
* @author shenlongguang<https://github.com/ifengkou>
* @date 2017/4/11 17:43
*/
@Controller
@EnableAutoConfiguration
public class SampleController {
@RequestMapping("/")
@ResponseBody
String home() {
return "hello world";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
}
}
@EnableAutoConfiguration,用于自动配置，它会根据你的pom配置（实际上应该是根据具体的依赖）来判断这是一个什么应用，并建立相应的环境
SpringApplication 启动步骤
直接运行main方法直接启动
...... 一次完成的启动见后面的分析 2017-04-11 18:46:54.255 INFO 4868 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2017-04-11 18:46:54.307 INFO 4868 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2017-04-11 18:46:54.311 INFO 4868 --- [ main] c.i.s.controller.SampleController : Started SampleController in 2.585 seconds (JVM running for 3.044)
直接访问 localhost:8080 就能够看到页面输出 hello world
在classpath下的 application.properties 或者 application.yaml 文件中设置便可
好比更改端口号，变动项目路径，例以下面的配置就须要 localhost:8080/springboot才能访问
application.yaml
# Server settings (ServerProperties)
server:
port: 8080
address: 127.0.0.1
sessionTimeout: 30
contextPath: /springboot
# Tomcat specifics
tomcat:
accessLogEnabled: false
protocolHeader: x-forwarded-proto
remoteIpHeader: x-forwarded-for
basedir:
backgroundProcessorDelay: 30 # secs
application.properties
# Server settings (ServerProperties)
server.port=8080
server.address=127.0.0.1
#server.sessionTimeout=30
server.contextPath=/aaa
# Tomcat specifics #server.tomcat.accessLogEnabled=false server.tomcat.protocolHeader=x-forwarded-proto server.tomcat.remoteIpHeader=x-forwarded-for server.tomcat.basedir= server.tomcat.backgroundProcessorDelay=30
[ main] c.i.s.controller.SampleController : Starting SampleController on SC-201603222017 with PID 4868 (E:\workspace\spring-boot-test\target\classes started by Administrator in E:\workspace\spring-boot-test)
[ main] c.i.s.controller.SampleController : No active profile set, falling back to default profiles: default
[ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6d5620ce: startup date [Tue Apr 11 18:46:52 CST 2017]; root of context hierarchy
[ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
[ main] o.apache.catalina.core.StandardService : Starting service Tomcat
[ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.11
[ost-startStop-1] o.a.c.c.C.[.[localhost].[/springboot] : Initializing Spring embedded WebApplicationContext
[ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1377 ms
[ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
[ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
[ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
[ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
[ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
[ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6d5620ce: startup date [Tue Apr 11 18:46:52 CST 2017]; root of context hierarchy
[ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto java.lang.String cn.ifengkou.springboot.controller.SampleController.home()
[ 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)
[ 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)
[ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
[ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
[ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
[ main] c.i.s.controller.SampleController : Started SampleController in 2.585 seconds (JVM running for 3.044)
[0.1-8080-exec-3] o.a.c.c.C.[.[localhost].[/springboot] : Initializing Spring FrameworkServlet 'dispatcherServlet'
[0.1-8080-exec-3] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
[0.1-8080-exec-3] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 13 ms