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WebService大讲堂之Axis2(9):编写Axis2模块(Module)

发布时间:2020-12-17 01:10:22 所属栏目:安全 来源:网络整理
导读:? ??? 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
?

??? 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>webappsaxis2WEB-INFmodules目录中。???
??? 先来编写一个WebService类,代码如下:

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> 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:

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> 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:

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> 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:
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> < 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"/>

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> < 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:

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> < 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

??? moduleLoggingModule.class

??? moduleLogHandler.class

??? META-INFmodule.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

??? serviceMyService.class

??? META-INFservices.xml

??? logging.mar文件放在<Tomcat安装目录>webappsaxis2WEB-INFmodules目录中,将service.aar文件放在<Tomcat安装目录>webappsaxis2WEB-INFservices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。

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> // ??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。

(编辑:李大同)

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