flex4中httpservice与服务器端交互的值传递

<!--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在web.xml中定义

<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>

Servlet内容

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, HttpServletResponse response) throws ServletException, IOException {
    doGet(request, response);
  }

}

Flex应用程序

<?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>