flex+java开发，客户端如何获取session数据？？？？

[java]
import flex.messaging.*;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SessionRO {
 
  public HttpServletRequest request;
  public FlexSession session;

  public UsefulRemoteObject() {
      request = FlexContext.getHttpRequest();            
      session = FlexContext.getFlexSession();    
  }
 
  public String getSessionId() throws Exception {
      String s = new String();
      s = (String) session.getId();            
      return s;
  }

  public String getHeader(String h) throws Exception {
      String s = new String();
      s = (String) request.getHeader(h);            
      return h + "=" + s;
  }
}

[destination defination]
<destination id="myRODestination">
  <properties>
      <source>myROPackage.SessionRO</source>
  </properties>
</destination>

[actionscript]
ro = new RemoteObject();
ro.destination = "myRODestination";
ro.getSessionId.addEventListener("result", getSessionIdResultHandler);
ro.getSessionId();