Android操作配置文件封装类，使用json序列化的方式实现

SysCfg sysCfg = SysCfg.getInstance();
//从文件中加载json配置信息到sysCfg
sysCfg.load();

package com.yangyongzhen.demo;
import com.yangyongzhen.configer.Configer;
import com.yangyongzhen.configer.Ignore;
/**
SysCfg 系统配置类
*/
public class SysCfg extends Configer {
    //Ignore,不序列化存储的使用Ignore注解
    @Ignore
    public static final String TAG = SysCfg.class.getSimpleName(); //做为配置文件的默认文件名
    @Ignore
    private static SysCfg _instance = null;
    private Integer Ver = 0;        //版本号
    private String Time ="";    //时间
    private String PosCode = ""; //终端编号
    private String UserName = "";   //登录用户名
    private String UserPwd = "";      //密码
    public SysCfg() {
        super(TAG);
    }
    private SysCfg(String filename) {
        super(filename);
    }
    public Integer getVer() {
        return Ver;
    }
    public void setVer(Integer ver) {
        Ver = ver;
    }
    public String getTime() {
        return Time;
    }
    public void setTime(String time) {
        Time = time;
    }
    public String getPosCode() {
        return PosCode;
    }
    public void setPosCode(String posCode) {
        PosCode = posCode;
    }
    public String getUserName() {
        return UserName;
    }
    public void setUserName(String userName) {
        UserName = userName;
    }
    public String getUserPwd() {
        return UserPwd;
    }
    public void setUserPwd(String userPwd) {
        UserPwd = userPwd;
    }
    @Override
    public String toString() {
        return "SysCfg{" +
                "Ver=" + Ver +
                ", Time='" + Time + '\'' +
                ", PosCode='" + PosCode + '\'' +
                ", UserName='" + UserName + '\'' +
                ", UserPwd='" + UserPwd + '\'' +
                '}';
    }
    public static SysCfg getInstance() {
        if (_instance == null) {
            synchronized(SysCfg.class){
                if (_instance == null) {
                    _instance = new SysCfg(TAG);
                }
            }
        }
        return _instance;
    }
}

package com.yangyongzhen.configer;
import android.os.Environment;
import android.text.TextUtils;
import android.util.Log;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.yangyongzhen.configer.utils.FileUtil;
import com.yangyongzhen.configer.utils.GsonUtil;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class Configer{
    private static final String TAG = "Configer";
    private static String rootPath = Environment.getExternalStorageDirectory().getAbsolutePath();
    private static String dirPath = "/Android/data";
    private transient String filename;
    public Configer(String filename) {
        this.filename = filename;
    }
    public Boolean save(){
        //Log.d(TAG,this.toString());
        String jsStr = GsonUtil.GsonString(this);
        //Log.d(TAG,jsStr);
        Boolean ret = FileUtil.writeFile(rootPath+dirPath,filename,jsStr);
        return ret;
    }
    public Boolean load(){
        Class<?> cls = this.getClass();
        Object rec = null;
        String strfile = FileUtil.readFile(rootPath+dirPath+"/"+filename,"");
        if (!TextUtils.isEmpty(strfile)) {
            JSONObject jsonObject = JSON.parseObject(strfile);
            rec = GsonUtil.deserializer(jsonObject, this.getClass());
            Log.d(TAG,rec.toString());
        }
        if(rec != null){
            Class<?> cls1 = rec.getClass();
            Field[] declaredFields = cls.getDeclaredFields();
            for (int i = 0; i < declaredFields.length; i++) {
                Field field = declaredFields[i];
                if (field.isAnnotationPresent(Ignore.class)) {
                    continue;
                }
                try {
                    Method method = cls1.getDeclaredMethod("get"+upperHeadChar(field.getName()));
                    Object obj = method.invoke(rec);
                    field.setAccessible(true);
                    field.set(this,obj);
                } catch (Exception e) {
                    Log.d(TAG,e.toString());
                    //e.printStackTrace();
                    return false;
                }
            }
            return true;
        }
        return false;
    }
    /**
     * 首字母大写，in:deleteDate，out:DeleteDate
     */
    public static String upperHeadChar(String in) {
        String head = in.substring(0, 1);
        String out = head.toUpperCase() + in.substring(1, in.length());
        return out;
    }
    public static String getRootPath() {
        return rootPath;
    }
    public static void setRootPath(String rootPath) {
        Configer.rootPath = rootPath;
    }
    public static String getDirPath() {
        return dirPath;
    }
    public static void setDirPath(String dirPath) {
        Configer.dirPath = dirPath;
    }
}