model.java

<j2me 开发精解> 詹建光著 里所有的源码。对J2me的开发相当有帮助

package com.j2medev.chapter4;

import javax.microedition.rms.*;
import java.io.*;

public class Model {
    private RecordStore accountStore = null;
    public static final String RNAME = "account";
    public Model() {
        //打开RecordStore对象，如果不存在就创建一个。
        try {
            accountStore = RecordStore.openRecordStore(RNAME, true);
        } catch (RecordStoreException e) {
            e.printStackTrace();
        }
    }
    //关闭RecordStore对象
    public void closeRecordStore() {
        try {
            accountStore.closeRecordStore();
        } catch (RecordStoreException e) {
            e.printStackTrace();
        }
    }
    //存储Account对象
    public void saveAccount(Account account) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        try {
            account.serialize(dos);
            byte[] data = baos.toByteArray();
            accountStore.addRecord(data, 0, data.length);
            dos.close();
        } catch (IOException e) {
            //处理异常
            e.printStackTrace();
        } catch (RecordStoreException e) {
            //处理异常
            e.printStackTrace();
        }
    }
    //读取recordId对象
    public Account getAccount(int recordID) {
        try {
            if (accountStore.getNumRecords() > 0) {
                byte[] data = accountStore.getRecord(recordID);
                ByteArrayInputStream bais = new ByteArrayInputStream(data);
                DataInputStream dis = new DataInputStream(bais);
                Account account = Account.deserialize(dis);
                dis.close();
                return account;
            }
            return null;
        } catch (IOException e) {
            //处理异常
            return null;
        } catch (RecordStoreException e) {
            //处理异常
            return null;
        }
    }
}