listing 15-5.java

关于j2me的midlet事例源码, 能帮助你晋级!

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.io.*;
import javax.microedition.io.*;
public class socketconnection extends MIDlet implements CommandListener {
  private Command exit, start;
  private Display display;
  private Form form;
  public socketconnection () 
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    start = new Command("Start", Command.EXIT, 1);
    form = new Form("Read Write Socket");
    form.addCommand(exit);
    form.addCommand(start);
    form.setCommandListener(this);
  }
  public void startApp() throws MIDletStateChangeException 
  {
    display.setCurrent(form);
  }
  public void pauseApp() 
  {
  }
  public void destroyApp(boolean unconditional) 
  {
  }
  public void commandAction(Command command, Displayable displayable) 
  {
    if (command == exit) 
    {
      destroyApp(false);
      notifyDestroyed();
    }
    else if (command == start) 
    {
      try 
      {
       StreamConnection connection = (StreamConnection) Connector.open("socket://www.myserver.com:80");
       PrintStream output = 
         new PrintStream(connection.openOutputStream() );
       output.println( "GET /my.html HTTP/0.9\n\n" );
       output.flush();
       InputStream in = connection.openInputStream();
       int ch;
       while( ( ch = in.read() ) != -1 )
      {
         System.out.print( (char) ch );
       }
       in.close();
       output.close();
       connection.close();
     }
      catch( ConnectionNotFoundException error )
       {
         Alert alert = new Alert(
            "Error", "Cannot access socket.", null, null);
         alert.setTimeout(Alert.FOREVER);
         alert.setType(AlertType.ERROR);
         display.setCurrent(alert);      
        }
        catch( IOException error )
        {
         Alert alert = new Alert("Error", error.toString(), null, null);
         alert.setTimeout(Alert.FOREVER);
         alert.setType(AlertType.ERROR);
         display.setCurrent(alert);
        }
    }
  }
}