面向对象的RMS操作

将需要保存的数据集中起来形成一个model类，并且要实现序列化，比如：

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

public class LoginInfo{
	String name;
	String passowrd;
	boolean selected;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassowrd() {
		return passowrd;
	}
	public void setPassowrd(String passowrd) {
		this.passowrd = passowrd;
	}
	public boolean isSelected() {
		return selected;
	}
	public void setSelected(boolean selected) {
		this.selected = selected;
	}
	
	public byte[] serialize(){
		ByteArrayOutputStream bos=null;
		DataOutputStream dos=null;
		try {
			bos=new ByteArrayOutputStream();
			dos=new DataOutputStream(bos);
			dos.writeUTF(this.getName());
			dos.writeUTF(this.getPassowrd());
			dos.writeBoolean(this.isSelected());
			dos.flush();
			return bos.toByteArray();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				if(dos!=null)
					dos.close();
				if(bos!=null)
					bos.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return null;
	}
	
	public LoginInfo deserialize(byte[] data){
		LoginInfo instance=new LoginInfo();
		ByteArrayInputStream bis=new ByteArrayInputStream(data);
		DataInputStream dis=new DataInputStream(bis);
		try {
			instance.setName(dis.readUTF());
			instance.setPassowrd(dis.readUTF());
			instance.setSelected(dis.readBoolean());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				if(dis!=null)
					dis.close();
				if(bis!=null)
					bis.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return instance;
	}
	
}

操作RMS类

import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreException;
import javax.microedition.rms.RecordStoreFullException;
import javax.microedition.rms.RecordStoreNotFoundException;

public class RmsLoginInfo {
	static String rmsName="loginInfo";
	public void writeRecordStore(LoginInfo loginInfo){
		try {
			RecordStore rs=RecordStore.openRecordStore(rmsName,true);
			byte[] data=loginInfo.serialize();
			if(rs.getNumRecords()==0)
				rs.addRecord(data,0,data.length);
			else
				rs.setRecord(1,data,0,data.length);
			rs.closeRecordStore();
//			System.out.println("保存成功");
		} catch (RecordStoreFullException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (RecordStoreNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (RecordStoreException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public LoginInfo readRecordStore(){
		LoginInfo loginInfo=new LoginInfo();
		try {
			RecordStore rs=RecordStore.openRecordStore(rmsName,true);
			if(rs.getNumRecords()==0){
//				System.out.println("没有记录");
				rs.closeRecordStore();
				return null;
			}else{
				byte[] data=rs.getRecord(1);
				rs.closeRecordStore();
				return loginInfo.deserialize(data);;
			}
		} catch (RecordStoreFullException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (RecordStoreNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (RecordStoreException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	// 删除表
	public static void deleteRecordStore(){
		try {
//			System.out.println("记录被删除");
			RecordStore.deleteRecordStore(rmsName);
		} catch (RecordStoreNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (RecordStoreException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}

用法：

//读取记录，通常初始化的时候使用
RmsLoginInfo rms=new RmsLoginInfo();
LoginInfo loginInfo=rms.readRecordStore();
if(loginInfo!=null){
//这里可以对一些参数赋值
}else{
//
}

//保存用户名和密码
if(selected){
LoginInfo loginInfo=new LoginInfo();
loginInfo.setName(Consts.field0);
loginInfo.setPassowrd(Consts.field1);
loginInfo.setSelected(selected);
RmsLoginInfo rms=new RmsLoginInfo();
rms.writeRecordStore(loginInfo);
}else{
RmsLoginInfo.deleteRecordStore();
}