Load text file from a URL : StreamConnection « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. StreamConnection

/* 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
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 * 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.IOException;
import java.io.IOException;
import java.io.InputStream;

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

public class J2MEFirstExample extends MIDlet {

  private Display display;

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

  public J2MEFirstExample() {
    display = Display.getDisplay(this);
  }

  /**
   * This will be invoked when we start the MIDlet
   */
  public void startApp() {
    try {
      getViaStreamConnection(url);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  public void pauseApp() {

  }

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

  /**
   * read url via stream connection
   */
  void getViaStreamConnection(String url) throws IOException {
    StreamConnection c = null;
    InputStream s = null;
    StringBuffer b = new StringBuffer();
    TextBox t = null;
    try {
      c = (StreamConnection) Connector.open(url);
      s = c.openInputStream();
      int ch;
      while ((ch = s.read()) != -1) {
        b.append((char) ch);
      }
      System.out.println(b.toString());
      t = new TextBox("hello....", b.toString(), 1024, 0);
    } finally {
      if (s != null) {
        s.close();
      }
      if (c != null) {
        c.close();
      }
    }
    display.setCurrent(t);
  }

}