flex4+java整合

我的login.mxml是以下内容： <fx:Script>
<![CDATA[
import mx.rpc.events.FaultEvent;
import mx.controls.Alert;
protected function button1_clickHandler(event:MouseEvent):void
{
nameIpt.text="";
pwdInpt.text="";
}
public function submitContent():void{
//Alert.show(serv.destination);
serv.send();
} protected function serv_faultHandler(event:FaultEvent):void
{
Alert.show(event.fault.toString());
} ]]>
</fx:Script> <fx:Declarations>
<s:HTTPService id="serv" url="http://localhost:8400/logintest/login" useProxy="false" method="POST" fault="serv_faultHandler(event)" resultFormat="text">
<mx:request >
<username>
{nameIpt.text}
</username>
<password>
{pwdInpt.text}
</password>
</mx:request>
</s:HTTPService>
</fx:Declarations>
<mx:Form x="248" y="43" width="400" height="400" >
<s:Label text="Login"/>
<mx:FormItem label="Name">
<s:TextInput id="nameIpt"/>
</mx:FormItem>
<mx:FormItem label="Password">
<s:TextInput id="pwdInpt"/>
</mx:FormItem>

<s:HGroup width="200" height="30">
<s:Button label="Submit"  click="submitContent()"/>
<s:Button label="Reset" click="button1_clickHandler(event)"/>
</s:HGroup>

</mx:Form>
LoginServlet是以下内容：
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    } /**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("------LoginServlet------");
String name=request.getParameter("username");
String password=request.getParameter("password");

if(name!=null){
if(password!=null){
if("Rose".trim().equalsIgnoreCase(name)&&"123".trim().equalsIgnoreCase(password)){
System.out.println("getContextPath: "+request.getContextPath());
response.sendRedirect("success.jsp");
//request.getRequestDispatcher("success.jsp").forward(request, response);
}
}
}else{
request.getRequestDispatcher("index.jsp").forward(request, response);
}
} /**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}}
我想让用户先在页面输入用户名和密码，然后跳转到LoginServlet ,如果用户名和密码正确就转到success.jsp，否则转到index.jsp。我已经调试过，可以进入LoginServlet ，就是在转发和重定向的时候不能到指定页面。但是如里在浏览器里直接访问http://localhost:8400/logintest/login就可以转入正确的页面。（web.xml也已经配置）请问各位高手，怎么解决这个问题啊