Axis Web Service开发之旅 (八) --编写Axis2模块(Module)
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Module和Handler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. 在axis2.xml文件中配置Axis2模块。
5. 在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; } } 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。
第1步:编写LoggingModule类
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; } } 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”。
第2步:编写LogHandler类
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; } } 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。
第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> <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>
第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> <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>
第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> <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>
第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.mar和service.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
将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MyService的getGreeting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.myServicemy=newWSC.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
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