個(gè)人認(rèn)為振坚，研究一個(gè)框架的開(kāi)始，你得先把它運(yùn)行起來(lái)逃片，然后可以通過(guò)一些手段來(lái)研究屡拨，比如常見(jiàn)的方式是debug,了解內(nèi)部運(yùn)行機(jī)制，從而能夠從框架里面吸收一些優(yōu)點(diǎn)運(yùn)用到我們的實(shí)際開(kāi)發(fā)中褥实。我們將采用“先看現(xiàn)象呀狼，再看本質(zhì)”的流程來(lái)看一下spring boot 這個(gè)優(yōu)秀的框架。目前階段先看現(xiàn)象损离，也就是如果使用哥艇。后續(xù)會(huì)通過(guò)源碼的角度來(lái)深入分析下他是如何實(shí)現(xiàn)的，也就是我們說(shuō)的“再看本質(zhì)”僻澎。
spring boot 現(xiàn)在這么流行貌踏，幾乎可以任何微服務(wù)的“底座”，必然是有它的道理的窟勃。其中最重要的一個(gè)原因就是接入方便祖乳。基本上jar包一引入秉氧，加一個(gè)注解眷昆，就可以了，你就擁有了spring boot的強(qiáng)大的功能了汁咏。另外一個(gè)原因就是擴(kuò)展spring,詳情請(qǐng)看我的另外一篇文章我眼中的spring boot亚斋，不做累述。下面我們看看是spring boot 的啟動(dòng)時(shí)多方便攘滩。已經(jīng)知道的帅刊，請(qǐng)移步，不適合你們了漂问。本次教程使用的spring boot 的版本是1.3.5.RELEASE赖瞒。
本次教程的源碼采用project-module的形式女揭。講解的每個(gè)知識(shí)點(diǎn)都采用一個(gè)module的形式展現(xiàn)，循序漸進(jìn)冒黑，大家可以從github上下載到源碼田绑。
首先我們?cè)賞arent pom中定義下我們的引入的spring boot的版本
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring-boot.version>1.3.5.RELEASE</spring-boot.version>
<maven.compiler.version>3.1</maven.compiler.version>
</properties>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
本節(jié)課的項(xiàng)目名稱(chēng)叫做spring-boot-start勤哗。這個(gè)module的pom中抡爹，需要引入spring boot 的模塊
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
引入spring-boot-start模塊，主要是spring boot依賴(lài)的一些基礎(chǔ)包芒划，比如spring,log 等冬竟。spring-boot-starter-web 主要是提供web服務(wù)，因?yàn)槲覀內(nèi)绻枰┞斗?wù)就需要有容器民逼，所以它里面默認(rèn)導(dǎo)入了tomcat web 容器提供服務(wù)泵殴，默認(rèn)端口8080，當(dāng)然也可以需要不用tomcat,用jetty拼苍，不用8080端口笑诅，使用8081等，這些都可以通過(guò)配置文件改變疮鲫，不需要改一點(diǎn)代碼吆你。
剩下的就是在代碼中寫(xiě)一個(gè)main方法，在類(lèi)上打上注解就行了
@SpringBootApplication
public class ApplicationMain {
public static void main(String[] args) {
SpringApplication.run(ApplicationMain.class, args);
System.out.println(new SimpleDateFormat("[yyyy-MM-dd HH:mm:ss]").format(new Date()) + " server started!");
}}
然后就可以啟動(dòng)了
/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=53281:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/lib/tools.jar:/Users/olifer/github/spring-boot-test/spring-boot-start/target/classes:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-starter/1.3.5.RELEASE/spring-boot-starter-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot/1.3.5.RELEASE/spring-boot-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/spring-context/4.2.6.RELEASE/spring-context-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/1.3.5.RELEASE/spring-boot-autoconfigure-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-starter-logging/1.3.5.RELEASE/spring-boot-starter-logging-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar:/Users/olifer/.m2/repository/ch/qos/logback/logback-core/1.1.7/logback-core-1.1.7.jar:/Users/olifer/.m2/repository/org/slf4j/slf4j-api/1.7.21/slf4j-api-1.7.21.jar:/Users/olifer/.m2/repository/org/slf4j/jcl-over-slf4j/1.7.21/jcl-over-slf4j-1.7.21.jar:/Users/olifer/.m2/repository/org/slf4j/jul-to-slf4j/1.7.21/jul-to-slf4j-1.7.21.jar:/Users/olifer/.m2/repository/org/slf4j/log4j-over-slf4j/1.7.21/log4j-over-slf4j-1.7.21.jar:/Users/olifer/.m2/repository/org/springframework/spring-core/4.2.6.RELEASE/spring-core-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/org/yaml/snakeyaml/1.16/snakeyaml-1.16.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-starter-web/1.3.5.RELEASE/spring-boot-starter-web-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/1.3.5.RELEASE/spring-boot-starter-tomcat-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.0.33/tomcat-embed-core-8.0.33.jar:/Users/olifer/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/8.0.33/tomcat-embed-el-8.0.33.jar:/Users/olifer/.m2/repository/org/apache/tomcat/embed/tomcat-embed-logging-juli/8.0.33/tomcat-embed-logging-juli-8.0.33.jar:/Users/olifer/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/8.0.33/tomcat-embed-websocket-8.0.33.jar:/Users/olifer/.m2/repository/org/springframework/boot/spring-boot-starter-validation/1.3.5.RELEASE/spring-boot-starter-validation-1.3.5.RELEASE.jar:/Users/olifer/.m2/repository/org/hibernate/hibernate-validator/5.2.4.Final/hibernate-validator-5.2.4.Final.jar:/Users/olifer/.m2/repository/javax/validation/validation-api/1.1.0.Final/validation-api-1.1.0.Final.jar:/Users/olifer/.m2/repository/org/jboss/logging/jboss-logging/3.3.0.Final/jboss-logging-3.3.0.Final.jar:/Users/olifer/.m2/repository/com/fasterxml/classmate/1.1.0/classmate-1.1.0.jar:/Users/olifer/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.6.6/jackson-databind-2.6.6.jar:/Users/olifer/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.6.6/jackson-annotations-2.6.6.jar:/Users/olifer/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.6.6/jackson-core-2.6.6.jar:/Users/olifer/.m2/repository/org/springframework/spring-web/4.2.6.RELEASE/spring-web-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/spring-aop/4.2.6.RELEASE/spring-aop-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/aopalliance/aopalliance/1.0/aopalliance-1.0.jar:/Users/olifer/.m2/repository/org/springframework/spring-beans/4.2.6.RELEASE/spring-beans-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/spring-webmvc/4.2.6.RELEASE/spring-webmvc-4.2.6.RELEASE.jar:/Users/olifer/.m2/repository/org/springframework/spring-expression/4.2.6.RELEASE/spring-expression-4.2.6.RELEASE.jar com.shuqi.ApplicationMain
objc[1703]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.3.5.RELEASE)
2018-03-24 10:32:46.920 INFO 1703 --- [ main] com.shuqi.ApplicationMain : Starting ApplicationMain on oliferdeMacBook-Pro.local with PID 1703 (/Users/olifer/github/spring-boot-test/spring-boot-start/target/classes started by olifer in /Users/olifer/github/spring-boot-test)
2018-03-24 10:32:46.930 INFO 1703 --- [ main] com.shuqi.ApplicationMain : No active profile set, falling back to default profiles: default
2018-03-24 10:32:47.080 INFO 1703 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5e57643e: startup date [Sat Mar 24 10:32:47 CST 2018]; root of context hierarchy
2018-03-24 10:32:49.240 INFO 1703 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2018-03-24 10:32:49.265 INFO 1703 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2018-03-24 10:32:49.266 INFO 1703 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.33
2018-03-24 10:32:49.420 INFO 1703 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-03-24 10:32:49.421 INFO 1703 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2348 ms
2018-03-24 10:32:49.704 INFO 1703 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-03-24 10:32:49.711 INFO 1703 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-03-24 10:32:49.711 INFO 1703 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-03-24 10:32:49.712 INFO 1703 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-03-24 10:32:49.712 INFO 1703 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-03-24 10:32:50.129 INFO 1703 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5e57643e: startup date [Sat Mar 24 10:32:47 CST 2018]; root of context hierarchy
2018-03-24 10:32:50.229 INFO 1703 --- [ 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)
2018-03-24 10:32:50.230 INFO 1703 --- [ 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)
2018-03-24 10:32:50.262 INFO 1703 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-03-24 10:32:50.262 INFO 1703 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-03-24 10:32:50.305 INFO 1703 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-03-24 10:32:50.471 INFO 1703 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-03-24 10:32:50.622 INFO 1703 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-03-24 10:32:50.628 INFO 1703 --- [ main] com.shuqi.ApplicationMain : Started ApplicationMain in 4.859 seconds (JVM running for 5.543)
[2018-03-24 10:32:50] server started!
特別主要俊犯，這個(gè)啟動(dòng)類(lèi)的位置不是隨便選的妇多，一定要放到最外層，因?yàn)檫@涉及到掃描包中的Bean燕侠，切記Ｕ咦妗！绢彤！
下節(jié)將的內(nèi)容是：SpringBoot基礎(chǔ)教程(二)——與Mybatis的結(jié)合
