rmsdemo.java

J2ME的源码！我以前学习J2ME的源码哈！非常适合初学者

package rms;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.RecordStoreFullException;
import javax.microedition.rms.RecordStoreNotFoundException;
import javax.microedition.rms.RecordStoreNotOpenException;

public class RmsDemo extends MIDlet {
	private static final String RECORD_STORE_NAME="world";
	private RecordStore recordStore;
	private Form form;
	private static final String CONTENT="content";
	private int index;
	
	public RmsDemo(){
		form=new Form("Rms Demo");
		try{
			recordStore=RecordStore.openRecordStore(RECORD_STORE_NAME, true);
		}
		catch (RecordStoreFullException e) {
			e.printStackTrace();
		} catch (RecordStoreNotFoundException e) {
			e.printStackTrace();
		} catch (RecordStoreException e) {
			e.printStackTrace();
		}
		Display.getDisplay(this).setCurrent(form);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	protected void startApp() throws MIDletStateChangeException {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(bos);
		try {
			dos.writeUTF(CONTENT);
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] result = bos.toByteArray();
		try {
			index = recordStore.addRecord(result, 0, result.length);
			form.append("add a record of " + index);
		} catch (RecordStoreNotOpenException e) {
			e.printStackTrace();
		} catch (RecordStoreFullException e) {
			e.printStackTrace();
		} catch (RecordStoreException e) {
			e.printStackTrace();
		}
		try {
			bos.close();
			dos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}