MySharedpreference

来源：互联网发布：中山大学网络服务中心编辑：程序博客网时间：2024/06/16 17:01
public class MySharedpreference {    private static MySharedpreference instance;    UserInfo userInfo = null;    long startTime = 0l;    long endTime = 0l;    private Context mContext;    private MySharedpreference(Context context) {        mContext = context;    }    public static MySharedpreference getInstance(Context context) {        if (instance == null) {            synchronized (MySharedpreference.class) {                if (instance == null) {                    instance = new MySharedpreference(context);                }            }        }        return instance;    }   public void saveObject(UserInfo userInfo) throws IOException {        SharedPreferences sp =mContext.getSharedPreferences("userInfo", 0);        SharedPreferences.Editor edit = sp.edit();        edit.putString("userInfo", serialize(userInfo));        edit.commit();    }    public UserInfo getObject() throws IOException, ClassNotFoundException {        SharedPreferences sp = mContext.getSharedPreferences("userInfo", 0);        String userInfo = sp.getString("userInfo", null);        if (userInfo==null){            System.out.println("获取的内容的长度为零");            return null;        }        return deSerialization(userInfo);    }    /**     * 序列化对象     *     * @param userInfo     * @return     * @throws IOException     */    private String serialize(UserInfo userInfo) throws IOException {        startTime = System.currentTimeMillis();        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();        ObjectOutputStream objectOutputStream = new ObjectOutputStream(                byteArrayOutputStream);        objectOutputStream.writeObject(userInfo);        String serStr = byteArrayOutputStream.toString("ISO-8859-1");        serStr = java.net.URLEncoder.encode(serStr, "UTF-8");        objectOutputStream.close();        byteArrayOutputStream.close();        Log.d("serial", "serialize str =" + serStr);        endTime = System.currentTimeMillis();        Log.d("serial", "序列化耗时为:" + (endTime - startTime));        return serStr;    }    /**     * 反序列化对象     *     * @param str     * @return     * @throws IOException     * @throws ClassNotFoundException     */    private UserInfo deSerialization(String str) throws IOException,            ClassNotFoundException {        startTime = System.currentTimeMillis();        String redStr = java.net.URLDecoder.decode(str, "UTF-8");        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(                redStr.getBytes("ISO-8859-1"));        ObjectInputStream objectInputStream = new ObjectInputStream(                byteArrayInputStream);        UserInfo userInfo = (UserInfo) objectInputStream.readObject();        objectInputStream.close();        byteArrayInputStream.close();        endTime = System.currentTimeMillis();        Log.d("serial", "反序列化耗时为:" + (endTime - startTime));        return userInfo;    }}
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