datarecord.java

很齐全通讯录

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;
import java.io.*;
public class DataRecord extends MIDlet implements CommandListener{
	private Command exitCommand;
	private Display display;
	private RecordStore rs;		// 定义记录存储rs
	private TextBox showMsg;	// 用于显示操作结果信息
	private String msg = null;	// 存放用于文本框显示的信息
	public DataRecord() {
		display = Display.getDisplay(this);
		showMsg = new TextBox("操作信息:", null, 512, TextField.ANY);
		exitCommand =new Command("退出",Command.EXIT,1);
		showMsg.addCommand(exitCommand);
		showMsg.setCommandListener(this);
	}
	public void startApp(){
		if (!OpenRS("tempRS"))
			msg = "记录存储tempRS打开失败";
		else {
			msg = "记录存储tempRS打开成功";
			if (AddRec()) {
				msg += "\n记录添加成功";
				msg += GetRec();
			}
			else {
				msg += "\n记录添加失败";
			}
		}
		showMsg.setString(msg);
 		display.setCurrent(showMsg);
   }
	public void pauseApp() { }
	public void destroyApp(boolean unconditional) {
		if (CloseRS())
			System.out.println("记录存储tempRS关闭成功");
		else
			System.out.println("记录存储tempRS关闭失败");
		if (DeleteRS("tempRS"))
			System.out.println("记录存储tempRS删除成功");
		else
			System.out.println("记录存储tempRS删除失败");
	}
	public void commandAction(Command c,Displayable d) {
		if (c == exitCommand) {
			destroyApp(false);
			notifyDestroyed();
		}
	}
	// 添加记录
    public boolean AddRec() {
		String[] name = {"李建成","徐雅琳","杨斌成","胥湘莉"};
		boolean[] sex = {true,false,true,false};
		String[] phone = {"67897457","84782548","84789569","45871258"};
		int[] age = {34,29,30,26};
		Friend fnd =  new Friend();
		for (int i=0; i<4 ; i++) {
			fnd.name = name[i];
			fnd.sex = sex[i];
			fnd.phone = phone[i];
			fnd.age = age[i];
			byte [] data = fnd.encode();
			try {
				rs.addRecord(data, 0, data.length);
			}
			catch (RecordStoreException e) {
				return false;
			}
		}
		return true;
    }
    // 读取所有记录
    public String GetRec() {
		int id, num;
		String message = null;
		try {
			id = rs.getNextRecordID();
			num = rs.getNumRecords();
			message = "\n记录存储中共有" + num + "条记录:";
		}
		catch (RecordStoreException e) {
			message = "\n记录读取失败!";
	        return message;		
		}
		Friend fnd =  new Friend();
		byte [] data = null;
		if (num >0) {
			for (int i=1; i<id; i++) {
				try {
					data = rs.getRecord(i);
					fnd.decode(data);
					message += "\n记录号：" + i;
					message += "\n姓名：" + fnd.name + "；";
					if (fnd.sex)
						message += "性别：" + "男";
					else
						message += "性别：" + "女";
					message += "\n电话号码：" + fnd.phone + "；";
					message += "年龄：" + fnd.age;
				}
				catch (InvalidRecordIDException e) { }
				catch (RecordStoreException e) {
					message += "\n记录读取失败!";
				}
			}
		}
        return message;
    }
	// 打开（创建）记录存储
	public boolean OpenRS(String rsName) {
		try {
			rs = RecordStore.openRecordStore(rsName, true);
			return true;
		}
		catch(RecordStoreException e) { }
		return false;
	}
	// 关闭记录存储
	public boolean CloseRS() {
		if(rs != null) {
			try {
				rs.closeRecordStore();
				rs = null;
				return true;
			}
			catch(RecordStoreException e) { }
		}
		return false;
	}
    // 删除记录存储
    public boolean DeleteRS(String rsName) {
        try {
            RecordStore.deleteRecordStore(rsName);
            return true;
        }
        catch(RecordStoreException e) { }
        return false;
    }
	// 定义一个类用于实现联系人数据的转换
	class Friend{
		public String name, phone;
		public boolean sex;
		public int age;
		public Friend(){
			name = phone = "";
			sex = false;
			age = 0;
		}
		// 将数据格式化成为字节数组
		public byte[] encode(){
			byte[] data = null;
			try{
				ByteArrayOutputStream bout = new ByteArrayOutputStream();
				DataOutputStream dout = new DataOutputStream(bout);
				dout.writeUTF(name);
				dout.writeBoolean(sex);
				dout.writeUTF(phone);
				dout.writeInt(age);
				data = bout.toByteArray();
				dout.close();
				bout.close();				
			}catch(Exception e){ }
			return data;
		}
		// 将字节数组还原为原始数据
		public void decode(byte[] data){
			try{
				ByteArrayInputStream bin = new ByteArrayInputStream(data);
				DataInputStream din = new DataInputStream(bin);
				name = din.readUTF();
				sex = din.readBoolean();
				phone = din.readUTF();
				age = din.readInt();
				din.close();
				bin.close();
			}catch(Exception e){ }
		}
	}
}