www.pudn.com > 20049791944754.zip > PrimitiveMIDlet.java

/* 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
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 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
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 *  
 * You acknowledge that this software is not designed, licensed or intended
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 */

import java.io.*; 
 
import javax.microedition.io.*; 
import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 
 
public class PrimitiveMIDlet 
    extends MIDlet 
    implements CommandListener { 
  private Display mDisplay; 
  private Form mMainForm; 
  private Command mExitCommand, mConnectCommand; 
   
  public void startApp() { 
    mDisplay = Display.getDisplay(this); 
     
    if (mMainForm == null) { 
      mMainForm = new Form("PrimitiveMIDlet"); 
      mMainForm.append(new StringItem("", 
      "Select Connect to make a network connection")); 
      mExitCommand = new Command("Exit", Command.EXIT, 0); 
      mConnectCommand = new Command("Connect", Command.SCREEN, 0); 
       
      mMainForm.addCommand(mExitCommand); 
      mMainForm.addCommand(mConnectCommand); 
      mMainForm.setCommandListener(this); 
    } 
     
    mDisplay.setCurrent(mMainForm); 
  } 
   
  public void commandAction(Command c, Displayable s) { 
    if (c == mExitCommand) 
      notifyDestroyed(); 
    else if (c == mConnectCommand) 
      connect(); 
  } 
   
  private void connect() { 
    String url = getAppProperty("NetworkThreading.URL"); 
     
    try { 
      // Query the server and retrieve the response. 
      HttpConnection hc = (HttpConnection)Connector.open(url); 
      InputStream in = hc.openInputStream(); 
       
      // Pull back the server's response. If a content length is not 
      // specified, we'll just read 255 bytes. 
      int contentLength = (int)hc.getLength(); 
      if (contentLength == -1) contentLength = 255; 
      byte[] raw = new byte[contentLength]; 
      int length = in.read(raw); 
       
      // Clean up. 
      in.close(); 
      hc.close(); 
       
      // Show the response to the user. 
      String s = new String(raw, 0, length); 
      Alert a = new Alert("Response", s, null, null); 
      a.setTimeout(Alert.FOREVER); 
      mDisplay.setCurrent(a, mMainForm); 
    } 
    catch (IOException ioe) { 
      Alert a = new Alert("Exception", ioe.toString(), null, null); 
      a.setTimeout(Alert.FOREVER); 
      mDisplay.setCurrent(a, mMainForm); 
    } 
  } 
   
  public void pauseApp() {} 
   
  public void destroyApp(boolean unconditional) {} 
}