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>