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WebService大讲堂之Axis2(九):编写Axis2模块(Module)

热度:612   发布时间:2012-07-05 07:59:17.0
WebService大讲堂之Axis2(9):编写Axis2模块(Module)

原文来自:http://www.blogjava.net/nokiaguy/archive/2009/02/13/254499.html

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Axis2可以通过模块(Module)进行扩展。Axis2模块至少需要有两个类,这两个类分别实现了ModuleHandler接口。开发和使用一个Axis2模块的步骤如下:

1.?编写实现Module接口的类。Axis2模块在进行初始化、销毁等动作时会调用该类中相应的方法)。

2.?编写实现Handler接口的类。该类是Axis2模块的业务处理类。

3.?编写module.xml文件。该文件放在META-INF目录中,用于配置Axis2模块。

4.?axis2.xml文件中配置Axis2模块。

5.?services.xml文件中配置Axis2模块。每一个Axis2模块都需要使用<module>元素引用才能使用。

6.?发布Axis2模块。需要使用jar命令将Axis2模块压缩成.mar包(文件扩展名必须是.mar),然后将.mar文件放在

<Tomcat安装目录>\webapps\axis2\WEB-INF\modules目录中。????
??? 先来编写一个WebService类,代码如下:

package?service;

public?class?MyService
{
????
public?String?getGreeting(String?name)
????{
????????
return?"您好?"?+?name;
????}
}

?

????下面我们来编写一个记录请求和响应SOAP消息的Axis2模块。当客户端调用WebService方法时,该Axis2模块会将请求和响应SOAP消息输出到Tomcat控制台上。

1步:编写LoggingModule

????LoggingModule类实现了Module接口,代码如下:

package?module;

import?org.apache.axis2.AxisFault;
import?org.apache.axis2.context.ConfigurationContext;
import?org.apache.axis2.description.AxisDescription;
import?org.apache.axis2.description.AxisModule;
import?org.apache.axis2.modules.Module;
import?org.apache.neethi.Assertion;
import?org.apache.neethi.Policy;

public?class?LoggingModule?implements?Module
{
????
//?initialize?the?module
????public?void?init(ConfigurationContext?configContext,?AxisModule?module)
????????????
throws?AxisFault
????{
????????System.out.println(
"init");
????}
????
public?void?engageNotify(AxisDescription?axisDescription)?throws?AxisFault
????{
????}
????
//?shutdown?the?module
????public?void?shutdown(ConfigurationContext?configurationContext)
????????????
throws?AxisFault
????{
????????System.out.println(
"shutdown");
????}
????
public?String[]?getPolicyNamespaces()
????{
????????
return?null;
????}
????
public?void?applyPolicy(Policy?policy,?AxisDescription?axisDescription)
????????????
throws?AxisFault
????{
????}
????
public?boolean?canSupportAssertion(Assertion?assertion)
????{
????????
return?true;
????}
}

????在本例中LoggingModule类并没实现实际的功能,但该类必须存在。当Tomcat启动时会装载该Axis2模块,同时会调用LoggingModule类的init方法,并在Tomcat控制台中输出“init”。

2步:编写LogHandler

????LogHandler类实现了Handler接口,代码如下:

package?module;

import?org.apache.axis2.AxisFault;
import?org.apache.axis2.context.MessageContext;
import?org.apache.axis2.engine.Handler;
import?org.apache.axis2.handlers.AbstractHandler;
import?org.apache.commons.logging.Log;
import?org.apache.commons.logging.LogFactory;

public?class?LogHandler?extends?AbstractHandler?implements?Handler
{
????
private?static?final?Log?log?=?LogFactory.getLog(LogHandler.class);
????
private?String?name;
????
public?String?getName()
????{
????????
return?name;
????}
????
public?InvocationResponse?invoke(MessageContext?msgContext)
????????????
throws?AxisFault
????{
????????
//??向Tomcat控制台输出请求和响应SOAP消息
????????log.info(msgContext.getEnvelope().toString());
????????
return?InvocationResponse.CONTINUE;
????}
????
public?void?revoke(MessageContext?msgContext)
????{
????????log.info(msgContext.getEnvelope().toString());
????}
????
public?void?setName(String?name)
????{
????????
this.name?=?name;
????}
}

?

????LogHandler类的核心方法是invoke,当使用该Axis2模块的WebService的方法被调用时,LogHandler类的invoke方法被调用。????

3步:编写module.xml文件????

????在META-INF目录中建立一个module.xml文件,内容如下:

<module?name="logging"?class="module.LoggingModule">
????
<InFlow>
????????
<handler?name="InFlowLogHandler"?class="module.LogHandler">
????????????
<order?phase="loggingPhase"/>
????????
</handler>
????
</InFlow>
????
<OutFlow>
????????
<handler?name="OutFlowLogHandler"?class="module.LogHandler">
????????????
<order?phase="loggingPhase"/>?
????????
</handler>
????
</OutFlow>

????
<OutFaultFlow>
????????
<handler?name="FaultOutFlowLogHandler"?class="module.LogHandler">
????????????
<order?phase="loggingPhase"/>
????????
</handler>
????
</OutFaultFlow>
????
<InFaultFlow>
????????
<handler?name="FaultInFlowLogHandler"?class="module.LogHandler">
????????????
<order?phase="loggingPhase"/>
????????
</handler>
????
</InFaultFlow>
</module>

4步:在axis2.xml文件中配置Axis2模块

????打开axis2.xml文件,分别在如下四个<phaseOrder>元素中加入<phase name="loggingPhase"/>

<phaseOrder?type="InFlow">
?????
??? <phase?name="soapmonitorPhase"/>
??? <phase?name="loggingPhase"/>
</phaseOrder>
<phaseOrder?type="OutFlow">
?????
????
<phase?name="Security"/>
????
<phase?name="loggingPhase"/>
</phaseOrder>
<phaseOrder?type="InFaultFlow">
?????
????
<phase?name="soapmonitorPhase"/>
????
<phase?name="loggingPhase"/>
</phaseOrder>
<phaseOrder?type="OutFaultFlow">
?????
????
<phase?name="Security"/>
????
<phase?name="loggingPhase"/>
</phaseOrder>

?

5步:在services.xml文件中引用logging模块

??? services.xml文件的内容如下:

<service?name="myService">
????
<description>
????????使用logging模块
????
</description>
????
<!--??引用logging模块??-->
????
<module?ref="logging"/>
????
<parameter?name="ServiceClass">
????????service.MyService???
????
</parameter>
????
<messageReceivers>
????????
<messageReceiver?mep="http://www.w3.org/2004/08/wsdl/in-out"
????????????class
="org.apache.axis2.rpc.receivers.RPCMessageReceiver"?/>
????
</messageReceivers>
</service>

6步:发布logging模块

????到现在为止,我们应用可以建立两个发行包:logging.marservice.aar。其中logging.mar文件是Axis2模块的发行包,该包的目录结构如下:

logging.mar

????module\LoggingModule.class

????module\LogHandler.class

????META-INF\module.xml

????service.aar文件是本例编写的WebService发行包,该包的目录结构如下:

service.aar

????service\MyService.class

????META-INF\services.xml

????logging.mar文件放在<Tomcat安装目录>\webapps\axis2\WEB-INF\modules目录中,将service.aar文件放在<Tomcat安装目录>\webapps\axis2\WEB-INF\services目录中。要注意的是,如果modules目录中包含了modules.list文件,Axis2会只装载在该文件中引用的Axis2模块,因此,必须在该文件中引用logging模块,该文件的内容如下:

addressing-1.4.1.mar

soapmonitor-1.4.1.mar

ping-1.4.1.mar

mex-1.4.1.mar

axis2-scripting-1.4.1.mar

logging.mar

????如果modules目录中不包含modules.list文件,则Axis2会装载modules文件中的所有Axis2模块。

????现在启动Tomcat,使用如下的C#代码调用MyServicegetGreeting方法则会在Tomcat控制台中输出相应的请求和响应SOAP消息。

//??async是引用MyService的服务名
async.myService?my?=?new?WSC.asyn.myService();
MessageBox.Show(my.getGreeting(
"中国"));
MessageBox.Show(
"完成调用");

?

????在执行上面的代码后,在Tomcat控制台中输出的信息如下图所示。

?

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