An example MIDlet to fetch a page using an HttpConnection : HttpConnection « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. HttpConnection

/* License
 * 
 * Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  
 *  * Redistribution of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 * 
 *  * Redistribution in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *  
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *  
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility. 
 */

import java.io.IOException;
import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.TextBox;
import javax.microedition.midlet.MIDlet;

/**
 * An example MIDlet to fetch a page using an HttpConnection.
 */
public class J2MESecondExample extends MIDlet {

  private Display display;
  private String url = "http://www.y.com/hello.txt";

  public J2MESecondExample() {
    display = Display.getDisplay(this);
  }

  /**
   * This will be invoked when we activate the MIDlet.
   */
  public void startApp() {
    // Use the specified URL is overriden in the descriptor
    try {
      downloadPage(url);
    } catch (IOException e) {
      // handle the exception
    }
  }

  private void downloadPage(String url) throws IOException {
    StringBuffer b = new StringBuffer();
    InputStream is = null;
    HttpConnection c = null;
    TextBox t = null;
    try {
      long len = 0;
      int ch = 0;

      c = (HttpConnection) Connector.open(url);
      is = c.openInputStream();

      len = c.getLength();
      if (len != -1) {
        // Read exactly Content-Length bytes
        for (int i = 0; i < len; i++)
          if ((ch = is.read()) != -1)
            b.append((char) ch);
      } else {
        // Read till the connection is closed.
        while ((ch = is.read()) != -1) {
          len = is.available();
          b.append((char) ch);
        }
      }
      t = new TextBox("hello again....", b.toString(), 1024, 0);
    } finally {
      is.close();
      c.close();
    }

    display.setCurrent(t);
  }

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

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

}