flex中httpservice与java后台交互的两种传值方式

环境：myeclipse8.5+flex4+blazeds
            描述：flex4中httpservice与服务器端交互的值传递问题
            方式一：通过<s:request/>标签进行交互，在该标签内部以要传递的参数名作为该标签内的子标签，值作为内容进行传递，服务端接受数据采用request.getParmeter("参数名")获取数据.
            示例代码：
            flex中的代码：

<!-- 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 >

        后台接受参数的代码：

         // 获取flex传递的参数 username password

        String username = request.getParameter( " username " );

         // get方式处理乱码

         // username=new String(username.getBytes("ISO-8859-1"),"utf-8");

        String password = request.getParameter( " password " );

         // password=new String(password.getBytes("ISO-8859-1"),"utf-8");

        方式二：第二种传值方式通过send()方法传值send方法中传递参数 ，服务端接受数据采用request.getParmeter("参数名")获取数据.
        示例代码：

                 //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 val: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

                val.username=txtusername.text;

                val.password=txtpassword.text;

                service.send(val);

        贴出完整的代码：
        服务器端:

package  com.servlet;

import  java.io.IOException;

import  java.io.PrintWriter;

import  java.util.ArrayList;

import  java.util.List;

import  javax.servlet.ServletException;

import  javax.servlet.http.HttpServlet;

import  javax.servlet.http.HttpServletRequest;

import  javax.servlet.http.HttpServletResponse;

/**

 * 功能描述:flex httpservice与java交互参数传递探讨<br>

 * @author sxyx2008<br>

 * @date 2010-07-19

 *

 */

@SuppressWarnings( " serial " )

public   class  TestHttpServiceServlet  extends  HttpServlet  {

    

    @Override

    protected void service(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        //处理post方式乱码

        request.setCharacterEncoding("utf-8");

        //设置浏览器输出字符编码

        response.setCharacterEncoding("utf-8");

        PrintWriter writer=response.getWriter();

        //获取flex传递的参数 username password

        String username=request.getParameter("username");

        //get方式处理乱码

        

        //username=new String(username.getBytes("ISO-8859-1"),"utf-8");

        String password=request.getParameter("password");

        //password=new String(password.getBytes("ISO-8859-1"),"utf-8");

        

        //构建一个list存放一些数据用来模拟用户是否存在这一功能

        List<String> list=new ArrayList<String>();

        list.add("张三");

        list.add("李四");

        list.add("王五");

        list.add("曹操");

        list.add("孙权");

        list.add("刘备");

        //检验用户

        if(list.contains(username)){

            writer.print("存在:"+username+"客户端传递的密码是:"+password);

        }else{

            writer.print("找不到:"+username+"客户端传递的密码是:"+password);

        }

        

    }

}

        flex代码：

<? 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;

            //调用失败

            protected function service_faultHandler(event:FaultEvent):void

            {

                Alert.show("失败了:"+event.message,"提示");

            }

            //调用成功

            protected function service_resultHandler(event:ResultEvent):void

            {

                Alert.show("成功了:"+event.result as String,"提示");

            }

    

            //调用

            protected function button1_clickHandler(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 val: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

                val.username=txtusername.text;

                val.password=txtpassword.text;

                service.send(val);

            }

         ]]>

     </ fx:Script >

     < fx:Declarations >

         <!--  将非可视元素（例如服务、值对象）放在此处  -->

         <!-- 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 >

        

        

     </ fx:Declarations >

     < s:TextInput  x ="332"  y ="196"  id ="txtusername" />

     < s:TextInput  x ="332"  y ="256"  id ="txtpassword"  displayAsPassword ="true" />

     < s:Button  x ="357"  y ="311"  label ="发送"  click ="button1_clickHandler(event)" />

     < s:Label  x ="290"  y ="206"  text ="用户名:" />

     < s:Label  x ="297"  y ="266"  text ="密码:" />

</ s:Application >