我比較懶惰，不想把user guide全部翻譯，就記錄一些點吧。
Axis2是全新設計的，在2004年的“Axis峰會”上，大家決定采用新的架構來讓Axis更加的富有彈性，更有效率，并且更加的可配置。Axis2現在具有的一些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現在看不懂，還是先動手做一下，感性認識一下吧
第一步：下載AXIS2。http://ws.apache.org/axis2/download.cgi。很有趣，在apache的Web Service 的Project目錄下面還看不到AXIS2。要下那個binary的版本，因為里面有例程。
第二步：Copy axis2.war到$TOMCAT_HOME/webapps目錄下面。Tomcat好像只能用JDK1.4，我在JDK1.5 用不出來。
第三步：打開 http://localhost:8080/axis2，就可以看到axis2的Welcome頁面了。點一下Validate 和Services，看是不是都沒有錯誤。都沒有錯誤的話，就表示deploy成功了。那個adminstration頁面可以通過上傳文件來hot deploy Web service，可以用來remote deploy。
第四步：研究例程。先從"samples/userguide/src"目錄下的例程看起。看到寫一個web service很簡單嘛:
public class MyService {
public OMElement echo(OMElement element) throws XMLStreamException {
//Praparing the OMElement so that it can be attached to another OM Tree.
//First the OMElement should be completely build in case it is not fully built and still
//some of the xml is in the stream.
element.build();
//Secondly the OMElement should be detached from the current OMTree so that it can be attached
//some other OM Tree. Once detached the OmTree will remove its connections to this OMElement.
element.detach();
return element;
}
public void ping(OMElement element) throws XMLStreamException {
//Do some processing
}
public void pingF(OMElement element) throws AxisFault{
throw new AxisFault("Fault being thrown");
}
}
看得出來，函數統一使用OMElement作為參數。在META-INF目錄下面有個services.xml文件：
<service name="MyService">
<description>
This is a sample Web Service with two operations,echo and ping.
</description>
<parameter name="ServiceClass" locked="false">userguide.example1.MyService</parameter>
<operation name="echo">
<messageReceiver class="org.apache.axis2.receivers.RawXMLINOutMessageReceiver"/>
</operation>
<operation name="ping">
<messageReceiver class="org.apache.axis2.receivers.RawXMLINOnlyMessageReceiver"/>
</operation>
</service>
呵呵，也很簡單嘛。有返回值的就用RawXMLINOutMessageReceiver，沒返回值的就用RawXMLINOnlyMessageReceiver。把它們編譯(要把axis2的jar寫到classpath里去)打包壓到 MyService.aar，包里文件目錄如下：
./\META-INF/services.xml
./userguide/example1/MyService.class
把MyService.aar拷貝到$TOMCAT_HOME/webapps/axis2/WEB-INF/services，然后去點一下http://localhost:8080/axis2頁面上的Services，也就是http://localhost:8080/axis2/listServices.jsp，就可以看到MyService已經被列出來了。
關于調用web service的東西蠻多，下次寫吧。