Maven打包打成JavaDoc包

<plugin>          
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <version>2.7</version>
    <executions>
      <execution>
        <id>attach-javadocs</id>
          <goals>
            <goal>jar</goal>
          </goals>
      </execution>
    </executions>
  </plugin>