最近在自学Spring Boot，上次一个朋友建议我放假时间都学习一些新东西，其中就包括Spring Boot，于是我打算先从Spring Boot下手，开始学习。
Spring Boot是用来简化新Spring应用的初始搭建以及开发过程，该框架使用了特定的方式进行配置，从而使开发人员需要定义样板化的配置。Spring Boot简化了Spring应用的创建、运行、调试、部署，使用Spring Boot可以做到专注于Spring应用的开发，而无需关注XML的配置。Spring Boot默认使用tomcat作为服务器，使用logback提供日志记录。
Spring MVC和Spring Boot的关系：Spring Boot是Spring MVC的升级版。
SpringBoot的特点：
（1）化繁为简、备受关注，是下一代框架。
（2）创建独立的Spring应用程序
（3）嵌入的tomcat，无需部署war文件
（4）简化maven配置
（5）自动配置Spring
（6）提供生产就绪行功能，如指标，健康检查和外部部署
（7）绝对没有代码生成和对XML没有要求配置
Spring Boot提供了一系列的依赖包，所以需要构建工具的支持。这里我使用的是maven构建工具，使用的是IDEA软件。
打开IDEA软件，新建一个maven项目：
进入到下一个页面：
next后进入到下一个页面：
在进入如下页面：
新建的项目如下（有两个文件不需要，故可以先删除）：
下面的创建项目时自动生成的：
看一下pom.xml内容：
<?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>com.gl</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.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>1.8</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>
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.10.RELEASE)
2018-01-31 17:32:08.632 INFO 12632 --- [ main] com.gl.demo.DemoApplication : Starting DemoApplication on SC-201703311422 with PID 12632 (D:\IDEA\demo\target\classes started by Administrator in D:\IDEA\demo)
2018-01-31 17:32:08.660 INFO 12632 --- [ main] com.gl.demo.DemoApplication : No active profile set, falling back to default profiles: default
2018-01-31 17:32:08.729 INFO 12632 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@b9e255: startup date [Wed Jan 31 17:32:08 CST 2018]; root of context hierarchy
2018-01-31 17:32:09.969 INFO 12632 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2018-01-31 17:32:09.982 INFO 12632 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-01-31 17:32:09.982 INFO 12632 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.27
2018-01-31 17:32:10.094 INFO 12632 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-01-31 17:32:10.094 INFO 12632 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1368 ms
2018-01-31 17:32:10.222 INFO 12632 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-01-31 17:32:10.225 INFO 12632 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-01-31 17:32:10.226 INFO 12632 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-01-31 17:32:10.226 INFO 12632 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-01-31 17:32:10.226 INFO 12632 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-01-31 17:32:10.520 INFO 12632 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@b9e255: startup date [Wed Jan 31 17:32:08 CST 2018]; root of context hierarchy
2018-01-31 17:32:10.575 INFO 12632 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/demo1],methods=[GET]}" onto public java.lang.String com.gl.demo.com.gl.action.DemoAction.demo1()
2018-01-31 17:32:10.580 INFO 12632 --- [ 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)
2018-01-31 17:32:10.580 INFO 12632 --- [ 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)
2018-01-31 17:32:10.605 INFO 12632 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-01-31 17:32:10.605 INFO 12632 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-01-31 17:32:10.648 INFO 12632 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-01-31 17:32:10.811 INFO 12632 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-01-31 17:32:10.882 INFO 12632 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-01-31 17:32:10.888 INFO 12632 --- [ main] com.gl.demo.DemoApplication : Started DemoApplication in 2.616 seconds (JVM running for 3.468)
启动成功。
新建一个action类，进行测试：
package com.gl.demo.com.gl.action;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
/**
*
* @author guoguo_li
*
*
*/
@RestController
public class DemoAction {
//映射，我习惯把方法名设为映射
@RequestMapping(value = "/demo1",method = RequestMethod.GET)
public String demo1() {
return "hello Spring Boot";
}
}
结果是：
然后是项目属性配置：
此时端口号变成了8081，运行结果如下：
这是一个SpringBoot的初步demo，初认识SpringBoot，后面还要继续深入学习SpringBoot。