HTTP Post Problem in j2me application

[Priyanka Gawada]

Hi have written a code which sends data from a midlet to the servlet using HTTP POST method.
When the HTTP GET method is used, data is received by the servlet, but with POST, it receives null.
What is the problem with the POST not able to find. Kindly help.

Here is the code of the midlet.

public class Email extends MIDlet implements CommandListener{
    Display display = null;
 
    TextField toField = null;
    TextField subjectField = null;
    TextField msgField = null;
    Form form;

    static final Command sendCommand = new Command("send", Command.OK, 2);
    static final Command clearCommand = new Command("clear", Command.STOP, 3);

    String to;
    String subject;
    String msg;


    public Email() {
       display = Display.getDisplay(this);
       toField = new TextField("To:", "", 25, TextField.EMAILADDR);
       subjectField = new TextField("Subject:", "", 15, TextField.ANY);
       msgField = new TextField("MsgBody:", "", 90, TextField.ANY);
       form = new Form("Fill Form");

    }

    public void startApp() throws MIDletStateChangeException {
      form.append(toField);
      form.append(subjectField);
      form.append(msgField);
      form.addCommand(clearCommand);
      form.addCommand(sendCommand);
      form.setCommandListener(this);
      display.setCurrent(form);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
      notifyDestroyed();
    }


    void invokeServlet() throws IOException {
        HttpConnection c = null;
        InputStream is = null;
        OutputStream os = null;
        StringBuffer b = new StringBuffer();
        TextBox t = null;
  // this is using GET that works fine
       /* String url = "http://localhost:8084/OrderManagementServer/EmailServlet?to="+ to + "&subject=" + subject + "&msg="+ msg;
        try {
              c = (HttpConnection)Connector.open(url);
                c.setRequestMethod(HttpConnection.GET);
            c.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Confirguration/CLDC-1.0");
            c.setRequestProperty("Content-Language", "en-CA");
            os = c.openOutputStream();*/

        try {
             String url = "http://localhost:8084/OrderManagementServer/EmailServlet";
             c = (HttpConnection)Connector.open(url);
             c.setRequestMethod(HttpConnection.POST);
             c.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            c.setRequestProperty("IF-Modified-Since", "20 Oct 2001 16:19:14 GMT");
            c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Configuration/CLDC-1.0");
           c.setRequestProperty("Content-Language", "en-CA");
          
          os = c.openOutputStream();
          // encode data
          os.write(("to="+to).getBytes());
          os.write(("&subject="+subject).getBytes());
          os.write(("&msg="+msg).getBytes());
          os.flush();
          is = c.openDataInputStream();
          int ch;
          while ((ch = is.read()) != -1) {
            b.append((char) ch);
            System.out.print((char)ch);
          }
         t = new TextBox("Confirmation", b.toString(), 1024, 0);
         t.setCommandListener(this);
        } finally {
           if(is!= null) {
              is.close();
           }
           if(os != null) {
              os.close();
           }
           if(c != null) {
              c.close();
           }
        }
        display.setCurrent(t);
    }

   public void commandAction(Command c, Displayable d) {
      String label = c.getLabel();
      if(label.equals("clear")) {
        destroyApp(true);
      } else if (label.equals("send")) {
          System.out.println("ffff");
         to = toField.getString();
         subject = subjectField.getString();
         msg = msgField.getString();
         try {
             System.out.println("ggg");
           invokeServlet();
         }catch(IOException e) {
         e.printStackTrace();}
      }
   }
}

Here is the code of the servlet:

public class EmailServlet extends HttpServlet {
   
      protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/plain");
        PrintWriter out = response.getWriter();

        String to = request.getParameter("to");
        String subject = request.getParameter("subject");
        String msg = request.getParameter("msg");
        System.out.println(to + "  " + subject + "   " + msg);
      } 

   
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    public String getServletInfo() {
        return "Short description";
    }

}

[Swastik Dey]

Priyanka,

As far as my knowledge goes, getParameter works when the is data is sent through querystring or through request headers. But in this case as you are writing the data in outputstream at the midlet end, you have to read it from inputstream at the servlet end. I may be wrong on this but this my thought.