Flex与Java低数据量通信息一：HTTPService
学习了一下Flex，想总结一下Flex与Java通信的例子。其中Flex与Java高数据量的通信用的是Blazeds，大多的例子是Blazeds自带的实例整理的。
首先看看使用Flex中的HTTPService如何与Java的Servlet通信。
Java端如下：
public class LoginServlet extends HttpServlet {private static final long serialVersionUID = 7780152800409281311L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String username = request.getParameter("username");String password = request.getParameter("userpassword");String message = null;if (null == username || null == password || "".equals(username)|| "".equals(password)) {message = "failure";} else if ("mengya".equals(username) && "mengya".equals(password)) {message = "succeed";} else {message = "failure";}//返回客户端的是一个xmlresponse.setContentType("text/xml");PrintWriter out = response.getWriter();out.print("<result>");out.print("<message>");out.print(message);out.print("</message>");out.print("</result>");}}与AJAX有点类似。
Flex端如下(主具的设计可以下载下面的源码)：
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundGradientAlphas="[1.0, 1.0]" backgroundGradientColors="[#FD1D06, #EAF807]" height="328" width="428"> <mx:HTTPService showBusyCursor="true" id="loginSrv" result="doResult();" method="GET" url="http://localhost:8080/FlexStudy/LoginServlet"> <mx:request> <username> {txtname.text} </username> <userpassword> {txtpwd.text} </userpassword> </mx:request> </mx:HTTPService><mx:Script><![CDATA[import mx.controls.Alert;private function doResult():void{var returnValue:String=loginSrv.lastResult.result.message; if(returnValue=="succeed") { this.currentState="login"; } else { Alert.show("您的登录失败了","提示信息",Alert.OK,this,null,null,Alert.YES); }}]]></mx:Script><mx:Panel id="loginPanel" x="69.5" y="52" width="289" height="200" layout="absolute" title="登陆" fontSize="12"><mx:Button x="110" y="108" label="提交" id="btnSubmit" click="loginSrv.send();"/><mx:TextInput x="79" y="30" fontSize="12" id="txtname"/><mx:TextInput x="79" y="62" id="txtpwd" displayAsPassword="true"/><mx:Label x="21" y="32" text="姓名：" id="lbname" fontSize="12" fontWeight="bold"/><mx:Label x="21" y="64" text="密码：" id="lbpwd" fontSize="12" fontWeight="bold"/></mx:Panel></mx:Application>?
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