Spring Boot入門，這裡使用的是IDEA軟體
最近在自學Spring Boot，上次一個朋友建議我放假時間都學習一些新東西，其中就包括Spring Boot，於是我打算先從Spring Boot下手，開始學習。
Spring Boot是用來簡化新Spring應用的初始搭建以及開發過程，該框架使用了特定的方式進行配置，從而使開發人員需要定義樣板化的配置。Spring Boot簡化了Spring應用的建立、執行、除錯、部署，使用Spring Boot可以做到專注於Spring應用的開發，而無需關注XML的配置。Spring Boot預設使用tomcat作為伺服器，使用logback提供日誌記錄。
Spring MVC和Spring Boot的關係：Spring Boot是Spring MVC的升級版。
SpringBoot的特點：
（1）化繁為簡、備受關注，是下一代框架。
（2）建立獨立的Spring應用程式
（3）嵌入的tomcat，無需部署war檔案
（4）簡化maven配置
（5）自動配置Spring
（6）提供生產就緒行功能，如指標，健康檢查和外部部署
（7）絕對沒有程式碼生成和對XML沒有要求配置
Spring Boot提供了一系列的依賴包，所以需要構建工具的支援。這裡我使用的是maven構建工具，使用的是IDEA軟體。
開啟IDEA軟體，新建一個maven專案：
進入到下一個頁面：
next後進入到下一個頁面：
在進入如下頁面：
新建的專案如下（有兩個檔案不需要，故可以先刪除）：
下面的建立專案時自動生成的：
看一下pom.xml內容：
<?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>
啟動tomcat：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: 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[email protected]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[email protected]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)
啟動成功。
新建一個action類，進行測試：
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 {
//對映，我習慣把方法名設為對映
@RequestMapping(value = "/demo1",method = RequestMethod.GET)
public String demo1() {
return "hello Spring Boot";
}
}
結果是：
然後是專案屬性配置：
此時埠號變成了8081，執行結果如下：
這是一個SpringBoot的初步demo，初認識SpringBoot，後面還要繼續深入學習SpringBoot。