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新一代的Web Service实现包――AXIS2

Axis2是全新设计的,大家可以试试采用新的架构来让Axis更加的富有弹性,更有效率,并且更加的可配置。Axis2现在具有的一些feature
发布时间:2005-11-14 17:04        来源:        作者:Jackie
Axis2是全新设计的,大家可以试试采用新的架构来让Axis更加的富有弹性,更有效率,并且更加的可配置。Axis2现在具有的一些feature:










Speed
Low memory foot print
AXIOM - AXis Object Model
Hot Deployment
Asynchronous Web Services
MEP Support - 
Message Exchange Patterns
Flexibility
Stability
Component-oriented deployment
Transport framework
WSDL support
有些feature现在看不懂,还是先动手做一下,感性认识一下吧 第一步:下载AXIS2。http://ws.apache.org/axis2/download.cgi。很有趣,在apache 的Web Service 的Project目录下面还看不到AXIS2。要下那个binary的版本,因为里面有例程。 第二步:Copy axis2.war到$TOMCAT_HOME/webapps目录下面。Tomcat好像只能用JDK1.4,我在JDK1.5 用不出来。 第三步:打开http://localhost:8080/axis2,就可以看到axis2的Welcome页面了。点一 下Validate和Services,看是不是都没有错误。都没有错误的话,就表示deploy成功了。 那个adminstration页面可以通过上传文件来hot deploy Web service,可以用来remote deploy。 第四步:研究例程。先从"samples/userguide/src"目录下的例程看起。看到写一个web service很简单嘛:
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();
        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");
    }
}
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。 (T117)
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