WebService大讲堂之Axis2(8):异步调用WebService (转)
文章转自 :http://www.blogjava.net/nokiaguy/archive/2009/02/13/254548.html(银河使者)博文很不错。转载大家学习! 在前面几篇文章中都是使用同步方式来调用WebService。也就是说,如果被调用的WebService方法长时间不返回,客户端将一直被阻塞,直到该方法返回为止。使用同步方法来调用WebService虽然很直观,但当WebService方法由于各种原因需要很长时间才能返回的话,就会使客户端程序一直处于等待状态,这样用户是无法忍受的。 package service; public class MyService { public String getName() { try { System.out.println("getName方法正在执行"); // 延迟5秒 Thread.sleep(5000); } catch (Exception e) { } return "火星"; } }
<!-- services.xml --> <service name="myService"> <description> 异步调用演示 </description> <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>
package client; import javax.xml.namespace.QName; import org.apache.axis2.addressing.EndpointReference; import org.apache.axis2.client.Options; import org.apache.axis2.context.MessageContext; import org.apache.axis2.rpc.client.RPCServiceClient; public class RPCAsyncClient { public static void main(String[] args) throws Exception { RPCServiceClient serviceClient = new RPCServiceClient(); Options options = serviceClient.getOptions(); EndpointReference targetEPR = new EndpointReference( "http://localhost:8080/axis2/services/myService"); options.setTo(targetEPR); Object[] opAddEntryArgs = new Object[]{}; QName opAddEntry = new QName("http://service","getName"); serviceClient.invokeNonBlocking(opAddEntry,opAddEntryArgs,new org.apache.axis2.client.async.AxisCallback() { @Override public void onComplete() { } @Override public void onError(Exception arg0) { } } @Override public void onFault(MessageContext arg0) { } @Override public void onMessage(MessageContext mc) { // 输出返回值 System.out.println(mc.getEnvelope().getFirstElement() .getFirstElement().getFirstElement().getText()); } }); System.out.println("异步调用!"); // 阻止程序退出 System.in.read(); } }
异步调用! 火星
%AXIS2_HOME%binwsdl2java -uri http://localhost:8080/axis2/services/myService?wsdl -p client -s -a -o stub
package client; import client.MyServiceStub.GetNameResponse; class MyCallback extends MyServiceCallbackHandler { @Override public void receiveResultgetName(GetNameResponse result) { // 输出getName方法的返回结果 System.out.println(result.get_return()); } } public class StubClient { public static void main(String[] args) throws Exception { MyServiceStub stub = new MyServiceStub(); // 异步调用WebService stub.startgetName(new MyCallback()); System.out.println("异步调用!"); System.in.read(); } }
异步调用! 火星
// 回调方法 private void getNameCompletedEvent(object sender,WSC.asyn.getNameCompletedEventArgs e) { listBox1.Items.Add( e.Result.@return); } private void button1_Click(object sender,EventArgs e) { async.myService my = new WSC.async.myService(); my.getNameCompleted += new WSC.async.getNameCompletedEventHandler(getNameCompletedEvent); my.getNameAsync(); MessageBox.Show("完成调用"); } ? 其中async是引用MyService的服务名。要注意的是,在C#中不能在同一个WebService实例的getName方法未返回之前,再次调用该实例的getName方法,否则将抛出异常。如下面的代码会抛出一个异常: async.myService my = new WSC.async.myService(); my.getNameCompleted += new WSC.async.getNameCompletedEventHandler(getNameCompletedEvent); my.getNameAsync(); // 将抛出异常 my.getNameAsync(); ?? 但不同的WebService实例的方法可以在方法未返回时调用,如下面的代码是可以正常工作的: ? asyn.myService my = new WSC.asyn.myService(); my.getNameAsync(); my.getNameCompleted += new WSC.asyn.getNameCompletedEventHandler(getNameCompletedEvent); asyn.myService my1 = new WSC.asyn.myService(); my1.getNameCompleted += new WSC.asyn.getNameCompletedEventHandler(getNameCompletedEvent); my1.getNameAsync(); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |