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?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>
（编辑：李大同）
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