maven添加jetty插件，同时运行多个实例

<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>