Invoke Servlet Midlet 1 : Networks « J2ME « Java

Invoke Servlet Midlet 1

Learning Wireless Java
Help for New J2ME Developers
By Qusay Mahmoud
ISBN: 0-596-00243-2

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

 * An example MIDlet to invoke a servlet.

public class InvokeServletMidlet1 extends MIDlet {

   private Display display;
   String url = "";

   public InvokeServletMidlet1() {
      display = Display.getDisplay(this);

    * Initialization. Invoked when we activate the MIDlet.
   public void startApp() {
      try {
      } catch (IOException e) {
         System.out.println("IOException " + e);

    * Pause, discontinue ....
   public void pauseApp() {

    * Destroy must cleanup everything.
   public void destroyApp(boolean unconditional) {

    * Retrieve a grade....
   void invokeServlet(String url) throws IOException {
      HttpConnection c = null;
      InputStream is = null;
      StringBuffer b = new StringBuffer();
      TextBox t = null;
      try {
         c = (HttpConnection);
         c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Confirguration/CLDC-1.0");
         c.setRequestProperty("Content-Language", "en-CA");
         is = c.openDataInputStream();
         int ch;
         while ((ch = != -1) {
            b.append((char) ch);
         t = new TextBox("First Servlet", b.toString(), 1024, 0);
      } finally {
         if(is!= null) {
         if(c != null) {


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