public class MyService {
    public OMElement echo(OMElement element) throws XMLStreamException {
        //Praparing the OMElement so that it can be attached to another OM Tree.
        //First the OMElement should be completely build in case it is not fully built and still
        //some of the xml is in the stream.
        element.build();
        //Secondly the OMElement should be detached from the current OMTree so that it can be attached
        //some other OM Tree. Once detached the OmTree will remove its connections to this OMElement.
        element.detach();(来源www.iocblog.net)
        return element;
    }

    public void ping(OMElement element) throws XMLStreamException {
        //Do some processing
    }
    public void pingF(OMElement element) throws AxisFault{
        throw new AxisFault("Fault being thrown");
    }
}

 (来源www.iocblog.net)

看得出来，函数统一使用OMElement作为参数。在META-INF目录下面有个services.xml文件：
<service name="MyService">
    <description>
        This is a sample Web Service with two operations,echo and ping.
    </description>
    <parameter name="ServiceClass" locked="false">userguide.example1.MyService</parameter>
    <operation name="echo">
        <messageReceiver class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>
    </operation>
    <operation name="ping">
        <messageReceiver class="org.apache.axis2.receivers.RawXMLINOnlyMessageReceiver"/>
    </operation>
</service>
呵呵，也很简单嘛。有返回值的就用RawXMLINOutMessageReceiver，没返回值的就用RawXMLINOnlyMessageReceiver。把它们编译(要把axis2的jar写到classpath里去)打包压到 MyService.aar，包里文件目录如下：
./\META-INF/services.xml
./userguide/example1/MyService.class
把MyService.aar拷贝到$TOMCAT_HOME/webapps/axis2/WEB-INF/services，然后去点一下http://localhost:8080/axis2页面上的Services，也就是http://localhost:8080/axis2/listServices.jsp，就可以看到MyService已经被列出来了。

关于调用web service的东西蛮多，下次写吧。