一个简单的FileConnection范例

2019-11-18 16:05:39

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来源：转载

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

public class FileConnection extends MIDlet implements CommandListener {
  PRivate Command exit, start;
  private Display display;
  private Form form;
  public FileConnection ()
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    start = new Command("Start", Command.EXIT, 1);
    form = new Form("Write To File");
    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
      {
        OutputConnection connection = (OutputConnection)
          Connector.open("file://c:/myfile.txt;append=true", Connector.WRITE );
        OutputStream out = connection.openOutputStream();
        PrintStream output = new PrintStream( out );
        output.println( "This is a test." );
        out.close();
        connection.close();
        Alert alert = new Alert("Completed", "Data Written", null, null);
        alert.setTimeout(Alert.FOREVER);
        alert.setType(AlertType.ERROR);
        display.setCurrent(alert);
      }
      catch( ConnectionNotFoundException error )
       {
         Alert alert = new Alert(
              "Error", "Cannot access file.", 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);
        }
    }
  }
}

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