maven添加jetty插件，同時運行多個實例

<plugins>    <!-- jetty插件 -->    <plugin>        <groupId>org.eclipse.jetty</groupId>        <artifactId>jetty-maven-plugin</artifactId>        <!--<version>9.0.0.v20130308</version>-->        <version>9.2.7.v20150116</version>        <configuration>            <scanIntervalSeconds>3</scanIntervalSeconds>            <webApp>                <contextPath>/</contextPath>            </webApp>            <httpConnector>                <port>2224</port>            </httpConnector>            <reload>automatic</reload>        </configuration>    </plugin></plugins>