Spring cloud的Maven插件（二）：run目标

简介

　　Spring Boot Maven Plugin插件提供spring boot在maven中的支持。允许你打包可运行的jar包或war包。

　　插件提供了几个maven目标和Spring Boot 应用一起工作。总的有：

• spring-boot:repackage  请阅读：Spring cloud的Maven插件（一）：repackage目标
• spring-boot:run 请阅读：  Spring cloud的Maven插件（二）：run目标
• spring-boot:start and spring-boot:stop 
• spring-boot:build-info

　　run： 这个目标和直接java -jar 来启动基本相同，唯一不同的是java -jar需要打包后才能跑，而run目标不需要。这个当程序编译打包需要比较长时间时，用run目标来跑可以节约时间。

一、简单使用

　　Spring Boot Maven Plugin 包括一个 run 目标，该目标被用于从命令行启动你的应用程序。比如：

mvn spring-boot:run 

　　eclipse用法如下：

　　

　　启动后的日志：

[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building springboot 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> spring-boot-maven-plugin:1.5.6.RELEASE:run (default-cli) > test-compile @ springboot >>>
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ springboot ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ springboot ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ springboot ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ springboot ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] <<< spring-boot-maven-plugin:1.5.6.RELEASE:run (default-cli) < test-compile @ springboot <<<
[INFO] 
[INFO] 
[INFO] --- spring-boot-maven-plugin:1.5.6.RELEASE:run (default-cli) @ springboot ---
[INFO] Downloading: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-loader-tools/1.5.6.RELEASE/spring-boot-loader-tools-1.5.6.RELEASE.pom
[INFO] Downloaded: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-loader-tools/1.5.6.RELEASE/spring-boot-loader-tools-1.5.6.RELEASE.pom (3.8 kB at 5.0 kB/s)
[INFO] Downloading: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-loader-tools/1.5.6.RELEASE/spring-boot-loader-tools-1.5.6.RELEASE.jar
[INFO] Downloaded: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-loader-tools/1.5.6.RELEASE/spring-boot-loader-tools-1.5.6.RELEASE.jar (151 kB at 107 kB/s)

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _    
( ( )\___ | '_ | '_| | '_ / _` |    
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.6.RELEASE)

2017-09-16 16:15:53.173  INFO 6900 --- [           main] c.p.springboot.SpringbootApplication     : Starting SpringbootApplication on pc-PC with PID 6900 (D:qinxiongworkspaceSpringspringboot	argetclasses started by Administrator in D:qinxiongworkspaceSpringspringboot)
2017-09-16 16:15:53.173  INFO 6900 --- [           main] c.p.springboot.SpringbootApplication     : No active profile set, falling back to default profiles: default
2017-09-16 16:15:53.204  INFO 6900 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2689929b: startup date [Sat Sep 16 16:15:53 CST 2017]; root of context hierarchy
2017-09-16 16:15:54.668  INFO 6900 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-09-16 16:15:54.683  INFO 6900 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2017-09-16 16:15:54.683  INFO 6900 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.16
2017-09-16 16:15:54.762  INFO 6900 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-09-16 16:15:54.762  INFO 6900 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1558 ms
2017-09-16 16:15:54.918  INFO 6900 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-09-16 16:15:54.918  INFO 6900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-09-16 16:15:54.918  INFO 6900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-09-16 16:15:54.918  INFO 6900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-09-16 16:15:54.918  INFO 6900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-09-16 16:15:55.168  INFO 6900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2689929b: startup date [Sat Sep 16 16:15:53 CST 2017]; root of context hierarchy
2017-09-16 16:15:55.230  INFO 6900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.pitaya.springboot.HelloController.index()
2017-09-16 16:15:55.230  INFO 6900 --- [           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)
2017-09-16 16:15:55.230  INFO 6900 --- [           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)
2017-09-16 16:15:55.246  INFO 6900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-16 16:15:55.246  INFO 6900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-16 16:15:55.293  INFO 6900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-16 16:15:55.404  INFO 6900 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-09-16 16:15:55.466  INFO 6900 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-09-16 16:15:55.466  INFO 6900 --- [           main] c.p.springboot.SpringbootApplication     : Started SpringbootApplication in 2.637 seconds (JVM running for 8.001)

 二、实战

　　默认情况下，应用程序直接从Maven JVM执行。 如果您需要在分叉进程（maven进程fork出来的子进程）中运行，可以使用'fork'选项。 如果指定了'jvmArguments'或'agent'选项，或者如果存在devtools，应用程序也会在分叉进程执行。

　　如果需要指定一些JVM参数（即用于调试目的），可以使用jvmArguments参数，请看下面实例：

<project>
  ...
  <build>
    ...
    <plugins>
      ...
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>1.5.7.RELEASE</version>
        <configuration>
          <jvmArguments>
            -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005
          </jvmArguments>
        </configuration>
        ...
      </plugin>
      ...
    </plugins>
    ...
  </build>
  ...
</project>

　　请注意，由于您指定了一些JVM参数，所以该应用是自动在分叉进程中运行。这些参数也可以在命令行中指定，具体如下：

mvn spring-boot:run -Drun.jvmArguments="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"

　　当我们程序中设置了多个profile的yml文件，比如application.yml，application-dev.yml，application-test.yml，application-prd.yml。我们可以通过设置profiles参数来指定应用程序的active的profile。下面的例子演示指定要application.yml和application-test.yml两个文件。具体如下：

<project>
  ...
  <build>
    ...
    <plugins>
      ...
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>1.5.7.RELEASE</version>
        <configuration>
          <profiles>
            <profile>test</profile>
          </profiles>
        </configuration>
        ...
      </plugin>
      ...
    </plugins>
    ...
  </build>
  ...
</project>

　　如果要多加一个profile，只要多添加<profile>prd</profile>即可。

　　同样的，要启动的profiles也可以通过命令行来指定，需要使用多个profile时，用逗号隔开，具体如下：

mvn spring-boot:run -Drun.profiles=test,prd

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