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

本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/crazystone4/archive/2009/06/20/4285761.aspx

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