一个简单的FileConnection范例 |
| 作者：j2medev.com 来源：j2medev.com 发布时间：2006-7-25 8:55:09 |
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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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