flex4中httpservice与服务器端交互的值传递

原文摘录：http://www.voidcn.com/article/p-ghnfcyzm-z.html

<!--定义HttpService发送请求-->
        <s:HTTPService id="service" 
                       url="http://localhost:8080/testhttpservice/testHttpServiceServlet" 
                       useProxy="false" 
                       fault="service_faultHandler(event)" 
                       result="service_resultHandler(event)">
            <!--第一种传值方式-->
            
            <s:request >
                <!--参数名称作标签,中间填充参数值-->
                <username>{txtusername.text}</username>
                <password>{txtpassword.text}</password>
            </s:request>
            
        </s:HTTPService>

 	<servlet>
     	<servlet-name>UserServlet</servlet-name> 
    	<servlet-class>cn.servlet.UserServlet</servlet-class> 
   	</servlet>
    <servlet-mapping>
   		<servlet-name>UserServlet</servlet-name> 
    	<url-pattern>/UserServlet</url-pattern> 
  	</servlet-mapping> 
  

package cn.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UserServlet extends HttpServlet {

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
		System.out.println("***********  进入Services方法中 ***********");
		
                request.setCharacterEncoding("utf-8");  
                response.setCharacterEncoding("utf-8");  
        
                String userName=request.getParameter("username");  
                String passWord=request.getParameter("password");  
		
		PrintWriter out = response.getWriter();
		out.println("用户名："+ userName +"，密码："+ passWord);
		out.flush();
		out.close();
	}
	public void doPost(HttpServletRequest request,IOException {
		doGet(request,response);
	}
	
}

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
	<fx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			
			protected function http_result(event:ResultEvent):void {
				Alert.show("成功了:"+event.result as String,"提示"); 
			}
			
			protected function http_fault(event:FaultEvent):void {
				trace(event.message);
				Alert.show("失败了"); 
			}
			
			protected function btn_click(event:MouseEvent):void {
				//第一种传值方式                 
				service.send(); 
				
				//第二种传值方式 通过send()方法传值 send方法中传递参数  
				//定义一object对象 
//				var obj:Object=new Object(); 
//				//分别将文本框username，password的值传递到后台,object对象.参数名=值   传值操作 
//				obj.username = txt_name.text; 
//				obj.password = txt_pwd.text; 
//				service.send(obj); 
			}
			
		]]>
	</fx:Script>
	<fx:Declarations>
		<!--定义HttpService发送请求-->  
		<s:HTTPService id="service" url="UserServlet" method="POST" result="http_result(event)" fault="http_fault(event)">
			<!--第一种传值方式-->  
			<s:request>  
				<!--参数名称作标签,中间填充参数值-->  
				<username>{txt_name.text}</username>  
				<password>{txt_pwd.text}</password>  
			</s:request>  
		</s:HTTPService>
	</fx:Declarations>
	
	<s:TextInput x="332" y="196" id="txt_name"/>  
	<s:TextInput x="332" y="227" id="txt_pwd" displayAsPassword="true"/>  
	<s:Label x="286" y="201" text="用户名:" />  
	<s:Label x="298" y="233" text="密码:" />  
	<s:Button x="359" y="257" label="发送" click="btn_click(event)"/>  
</s:Application>