Flex调用jsp页面及其属性

flex的简单调用jsp页面的方法：

navigateToURL(new URLRequest("jsp的url地址”), "_blank");

     在开发web程序的过程中，我们经常要从session、application等JSP内置对象中获取变量值，在jsp页面、servlet中我们很容易就能办到，但是在Flex中就比较麻烦。不过，通过变通的方法我们还是可以从session、application对象中获取变量值的，其思路就是：通过HttpService组件访问一个通用的HttpServlet类，在HttpServlet类中根据不同的条件从不同的JSP内置对象中获取变量值。
      下面给出主要的代码供参考：

一、HttpServlet类的源码：

public class JspServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		response.setContentType("text/html");
		
		String scope = request.getParameter("scope");
		String param = request.getParameter("param");
		String result = null;
		
		if(scope.equals("session")){
			result = (String)request.getSession().getAttribute(param);
		}else if(scope.equals("application")){
			result = (String)getServletContext().getAttribute(param);
		}
		
		PrintWriter out = response.getWriter();
		out.print(result);
		out.flush();
		out.close();
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		doGet(request, response);
	}
}

二、mxml文件的源码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="init()">
	<mx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.rpc.Fault;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			
			private function call():void{
				jspServlet.request.scope = "application"; //表示要从application对象获取变量值
				jspServlet.request.param = "username"; //变量名
				jspServlet.send();
			}
			  
			private function resultHandler(event:ResultEvent):void{   
			    txt1.text = event.result as String;
			}
			   
			private function faultHandler(event:FaultEvent):void{   
			    var fault:Fault = event.fault;   
			    var s:String = (fault.faultDetail!=null) ? fault.faultDetail : fault.faultString;   
			    Alert.show(s); 
			}

		]]>
	</mx:Script>
	
	<mx:HTTPService id="jspServlet" url="../jspServlet"    
	    result="resultHandler(event)"  
	    fault="faultHandler(event)"  
	    resultFormat="text"  
	    method="POST"  
	    useProxy="false" 
	    showBusyCursor="true"/> 

	<mx:Button x="27" y="28" label="Load" click="call()"/>
	<mx:TextArea x="27" y="58" width="450" height="143" id="txt1"/>
	
</mx:Application>

参考
http://chenjumin.iteye.com/blog/426549
http://huangfeng555.iteye.com/blog/813361