j2me与jsp通信问题 - Java / J2ME

j2me中字符串data的值如下：
data = "&gps=1;0.0;0.0;0.0;2010-5-21 15:52;36"
用writeUTF(data)传给jsp

可是jsp中request.getParameter(“gps”)的值为null??

这个是MIDlet程序

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;


public class GPS_JSP extends MIDlet implements CommandListener{
  private Command stop, start;
  private Form form;
  private Display display;
  private Timeout timeout;
  private Thread gps;

  public GPS_JSP()
  {
  stop = new Command("Stop", Command.EXIT, 1);
  start = new Command("Start", Command.OK, 1);
  display = Display.getDisplay(this);
  form = new Form("GPS");
  form.addCommand(stop);
  form.addCommand(start);
  form.setCommandListener(this);


  }
  public void startApp() {
  display.setCurrent(form);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command command, Displayable displayable)
  {
  if(command == stop)
  {