systeminfo.java~16~

一個手機程序(電子詞典),一個不可多得的源碼程序,是學習J2ME的好東東.

package org.zblog.zenghelper.dbtool;

import java.io.DataInputStream;
import java.io.ByteArrayInputStream;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;

/**
 * <p>Title: ZEngHelper</p>
 *
 * <p>Description: Z英汉词典</p>
 *
 * <p>Copyright: Zcw Copyright (c) 2004</p>
 *
 * <p>Company: www.zblog.org Z动力</p>
 *
 * @author 朱传伟-ZCW
 * @version 1.0
 */
public class SystemInfo {
    private DbTool dt=DbTool.getInstance();
    public boolean isEnToCn=true;
    public boolean isRandom=true;

    /**
     * 从数据库初始化SystemInfo类
     */
    public void dbInit(){
        try{
            RecordStore rs=dt.openRS(DbTool.SYSTEM_DB);
            RecordEnumeration re=rs.enumerateRecords(null,null,false);
            if(re.hasNextElement()){
                byte[]bs=re.nextRecord();
                ByteArrayInputStream bis = new ByteArrayInputStream(bs);
                DataInputStream dis = new DataInputStream(bis);
                isEnToCn=dis.readBoolean();
                isRandom=dis.readBoolean();
                dis.close();
                bis.close();
            }
            rs.closeRecordStore();
         }
         catch(Exception e){
             e.printStackTrace();
        }
    }

    /**
     * 保存修改后的系统属性
     */
    public void store(){
        try{
            ByteArrayOutputStream bos=new ByteArrayOutputStream();
            DataOutputStream dos=new DataOutputStream(bos);
            dos.writeBoolean(isEnToCn);
            dos.writeBoolean(isRandom);
            byte[]bytes=bos.toByteArray();
            dos.close();
            bos.close();
            RecordStore rs=dt.openRS(DbTool.SYSTEM_DB);
            RecordEnumeration re=rs.enumerateRecords(null,null,false);
            if(re.hasNextElement()){
                int id=re.nextRecordId();
                rs.setRecord(id,bytes,0,bytes.length);
            }
            else{
                rs.addRecord(bytes,0,bytes.length);
            }
            rs.closeRecordStore();
         }
         catch(Exception e){
             e.printStackTrace();
        }
    }
}