Parameters from midlet to servlet

Question

Hi all,
i have been trying to pass values from MIDlet (setRequestProperty(); ) and to servlet (request.getParameter();).
but when i tried to print out the value, it just contained NULL value.
I had a look at the java forum website, there were plenty of same problems and no one got right.
I'll really appreciate it if anyone fixes this for me.
---------------------MIDLET-----------------------------------------------------------------------------
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import java.util.*;
import org.kxml.*;
import org.kxml.parser.*;
public class MbankMIDlet  extends MIDlet implements CommandListener {
  private Display display;
  private Form loginForm = new Form("Login");
  private Form mainForm = new Form("MobileBank");
  private String loguserID;
  private String logpass;
  private String mSession;
  private StringItem stringItem = new StringItem(null,"");
  private TextField userIDTextField = new TextField("User ID", "", 8, TextField.NUMERIC);
  private TextField passwordTextField = new TextField("Password", "", 12, TextField.PASSWORD);
  static final Command loginCommand = new Command("Login", Command.OK, 1);
  static final Command exitCommand = new Command("Exit", Command.STOP, 1);
  static final Command backCommand = new Command("Back",Command.BACK, 1);
  public MbankMIDlet() {
    mainForm.append(stringItem);
    mainForm.addCommand(exitCommand);
    mainForm.addCommand(backCommand);
    mainForm.setCommandListener(this);
  public void startApp() throws MIDletStateChangeException {
    display = Display.getDisplay(this);
    loginForm.append(userIDTextField);
    loginForm.append(passwordTextField);
    loginForm.addCommand(loginCommand);
    loginForm.addCommand(exitCommand);
    loginForm.addCommand(backCommand);
    loginForm.setCommandListener(this);
    display.setCurrent(loginForm);
  public void destroyApp(boolean unconditional) {
    notifyDestroyed();
  public void mainMenu() {
    display.setCurrent(loginForm);
  public void pauseApp() {
    display = null;
    loginForm = null;
    mainForm = null;
    stringItem = null;
    userIDTextField = null;
    passwordTextField = null;
  public void commandAction(Command c, Displayable d) {
    String label = c.getLabel();
    if (label.equals("Exit")) {
      destroyApp(true);
       mSession = null;
    } else if (label.equals("Login")) {
      login();
    } else if (label.equals("Back")){
      mainMenu();
  private void login() {
    loguserID = userIDTextField.getString();
    logpass = passwordTextField.getString();
    Form waitForm = new Form("Waiting...");
    display.setCurrent(waitForm);
    Thread t = new Thread() {
      public void run() {
        connect();
    t.start();
  private void connect() {
    HttpConnection hc = null;
    InputStream in = null;
    OutputStream os = null;
    String url = getAppProperty("MbankMIDlet.URL");
    try {
      hc = (HttpConnection)Connector.open(url);
      hc.setRequestMethod(HttpConnection.GET);
      hc.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0" );
      hc.setRequestProperty("Content-Language", "en-US" );
      hc.setRequestProperty("Accept", "text/plain");
      hc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded" );
      hc.setRequestProperty("Connection","close");
      hc.setRequestProperty("loguserID", loguserID);
      hc.setRequestProperty("logpass", logpass);
      os = hc.openOutputStream();
      os.close();
//      os.flush();  //tried close() and flush() but none of them worked.
      if (mSession != null) {
          hc.setRequestProperty("Cookie", mSession);
      // Read the session ID from a cookie in the response headers.
      String cookie = hc.getHeaderField("Set-cookie");
      if (cookie != null) {
          int semicolon = cookie.indexOf(';');
          mSession = cookie.substring(0, semicolon);
      in = hc.openInputStream();
      int rc = hc.getResponseCode();
      if( rc == HttpConnection.HTTP_OK ) { //HTTP_OK equals 200
        System.out.println("HttpConnection OK");
        StringBuffer xmlBuffer = new StringBuffer();
        String xmlString = null;
        int ch;
        while ( ( ch = in.read() ) != -1 )
          xmlBuffer.append( ( char )ch );
        xmlString = xmlBuffer.toString();
        stringItem.setText(xmlString);
      else if (rc == HttpConnection.HTTP_UNAUTHORIZED){//HTTP_UNAUTHORIZED equals 401
        System.out.println("HttpConnection Unauthorized");
        int contentLength = (int)hc.getLength();
        byte[] raw = new byte[contentLength];
        int length = in.read(raw);
        String s = new String(raw,0,length);
        stringItem.setText(s);
      in.close();
      hc.close();
    catch (IOException ioe) {
      stringItem.setText(ioe.toString());
    finally {
      display.setCurrent(mainForm);
}---------------SERVLET----------------------------------------------------------------------------
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
public class LoginServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          HttpSession session = request.getSession();
          response.setContentType("text/plain");
          PrintWriter out = response.getWriter();
          String userID, password, userRole = null;
          try {
                              userID = (String)request.getParameter("loguserID");
              password = (String)request.getParameter("logpass");
              System.out.println(userID); // "Null printed"              System.out.println(password);  // "Null printed"
          catch (Exception e) {
               //If anything goes wrong, print the Exception message
              e.printStackTrace(out);
}Thanks.

Answer 1

getParameter() can't parse the input stream well if there is any issues in the sent content. this is true, with varying mobile phone http impl.
You would find the content at servlet, by using request.getInputStream() and reading the entire content.
Here is the sample code:
public static String readMobileData(final HttpServletRequest aRequest) throws Exception
     String lData = null;
     Enumeration params = aRequest.getParameterNames();
     while (params.hasMoreElements())
     //from real Nokia 6600 Mobile the request is sent as param, though
     //it is post
     String lName = params.nextElement().toString();
     lData = aRequest.getParameter(lName);
     System.out.println("\nParameter:" + lName + "=" + lData);
     if (lData == null)
     //in emulator the data is coming as inputstream
     ServletInputStream in = aRequest.getInputStream();
     DataInputStream dIn = new DataInputStream(in);
     lData = dIn.readUTF();
     lData = lData.substring(lData.indexOf("=") + 1);
     System.out.println("Stream Request:\n" + lData);
     return lData;
Regards,
Raja Nagendra Kumar,
C.T.O,
When Teja is Tasked, the Job Gets Done
www.tejasoft.com