maven打包时，同时打包源码 Build a source-JAR from the current project.

Plugin: http://maven.apache.org/plugins/maven-source-plugin/

The Source Plugin has five goals:

• source:aggregate aggregrates sources for all modules in an aggregator project.
• source:jar is used to bundle the main sources of the project into a jar archive.
• source:test-jar on the other hand, is used to bundle the test sources of the project into a jar archive.
• source:jar-no-fork is similar to jar but does not fork the build lifecycle.
• source:test-jar-no-fork is similar to test-jar but does not fork the build lifecycle.

1. 打包 main 目录代码到 jar 归档文件

mvn source:jar

2. 打包 test 目录代码到 jar 归档文件

mvn source:test-jar

3. 如果不想每次都传入上面的参数，可以将插件目标绑定到mvn生命周期的阶段，

将maven-source-plugin的jar-no-fork目标绑定到default生命周期的verify阶段，

以后执行mvn install命令时，在verify之后install之前会自动打包源代码，
生成somenamexxx-1.0.0-sources.jar文件

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-source-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>attach-sources</id>
            <phase>verify</phase><!--  要绑定到的生命周期的阶段 在verify之后，install之前执行下面指定的goal -->
            <goals>
              <goal>jar-no-fork</goal><!-- 类似执行mvn source:jar -->
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  ...
</project>