stringrecord.java

很齐全通讯录

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;
public class StringRecord 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 StringRecord() {
		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"};
		String[] sex = {"男","女","男","女"};
		String[] phone = {"88974527","84825429","84895629","84871258"};
		String[] 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 + "；";
					message += "性别：" + fnd.sex;
					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, sex, phone, age;
		public Friend(){
			name = sex = phone = age = "";
		}
		//将数据格式化成为字节数组, 用分隔符号#来连接
		public byte[] encode(){
			String rec = name + "#" + sex + "#" + phone + "#" + age;
			byte[] data = rec.getBytes();
			return data;
		}
		//通过分隔符号#来将字节数组还原为原始数据
		public void decode(byte[] data){
			String rec = new String(data);
			name = sex = phone = age = "";
			int pos1 = rec.indexOf('#');
			if (pos1>=0) {
				name = rec.substring(0,pos1);
				int pos2 = rec.indexOf('#',pos1+1);
				if (pos2>pos1) {
					sex= rec.substring(pos1+1,pos2);
					int pos3 = rec.indexOf('#',pos2+1);
					if (pos3>pos2) {
						phone = rec.substring(pos2+1,pos3);
						age = rec.substring(pos3+1,rec.length());
					}
				}
			}
		}
	}
}