Java 数据保存与读取,保存数据信息并加密

String name =  "XXXXX";

保存数据：LocalDB.saveData("账号", name);

读取数据：String name = LocalDB.readData("账号");

// ===========================================================================================================// 2、保存数据到文件// ===========================================================================================================// 类LocalDB.javaimport java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.util.HashMap;import com.joymeng.mainview.log.LogConfigFile;/** 读数据：readData(String Key)、保存数据：saveData(String Key, String value) ----- 2015-9-24 上午11:44:52 wangzhongyuan */public class LocalDB{private static String pathString = "resource";private static String fileName = "LocalDB.data";    // 用于保存数据的文件名public static boolean loaded = false;               // 标识当前是否已进行了初始载入public static HashMap<String, Object> $object;public static HashMap<String, Integer> $int;public static HashMap<String, Float> $float;public static HashMap<String, String> $string;public static HashMap<String, Double> $double;public static HashMap<String, Long> $long;public static HashMap<String, Byte> $byte;public static HashMap<String, Short> $short;public static HashMap<String, Boolean> $boolean;// 使用HashMap的静态对象，在程序中临时保存数据// private static HashMap<String, Type> $type; //创建HashMap对象// HashMap用法如下：// $type.put(String key, Type value) //存储Type类型数据到$type，索引标识key 存储// $type.get(Object key) //从$type中获取索引标识key的数据 获取// $type.containsKey(Object key) //判断$type中是否含有索引标识key 判断// $type.remove(Object key) //将索引标识key对应的数据从$type中移除 移除/** 保存所有对象的数据，到文件fileName中 - 保存，HashMap对象数据到文件 */public static void save(){try{//if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) // 有SD卡//pathString = Environment.getExternalStorageDirectory().getPath();       // 获得SD卡路径{File file;FileOutputStream f;try{file = new File(pathString + "/" + fileName);if (!file.exists()) file.createNewFile(); // 若文件不存在，则新建f = new FileOutputStream(file, false);  // 创建一个文件输出流，true表示在文件末尾添加， false覆盖}catch (Exception e){return;}ObjectOutputStream o = new ObjectOutputStream(f);o.writeObject($object);o.writeObject($int);o.writeObject($byte);o.writeObject($float);o.writeObject($double);o.writeObject($string);o.writeObject($long);o.writeObject($boolean);o.writeObject($short);o.flush();f.flush();o.close();f.close();}}catch (Exception e){e.printStackTrace();}}/** 从文件fileName中，获取保存的数据到静态对象中 - 载入，保存数据到HashMap对象中 */@SuppressWarnings("unchecked")public static void load(){if (loaded) return;try{//if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) // 有SD卡//pathString = Environment.getExternalStorageDirectory().getPath();       // 获得SD卡路径{File file = null;FileInputStream f = null;try{file = new File(pathString + "/" + fileName);if (!file.exists()) file.createNewFile();    // 若文件不存在，则新建f = new FileInputStream(file);              // 从文件创建一个输入流}catch (Exception e){return;}try{ObjectInputStream o = new ObjectInputStream(f);$object = (HashMap<String, Object>) o.readObject();$int = (HashMap<String, Integer>) o.readObject();$byte = (HashMap<String, Byte>) o.readObject();$float = (HashMap<String, Float>) o.readObject();$double = (HashMap<String, Double>) o.readObject();$string = (HashMap<String, String>) o.readObject();$long = (HashMap<String, Long>) o.readObject();$boolean = (HashMap<String, Boolean>) o.readObject();$short = (HashMap<String, Short>) o.readObject();o.close();f.close();}catch (Exception e){$object = new HashMap<String, Object>();$float = new HashMap<String, Float>();$int = new HashMap<String, Integer>();$string = new HashMap<String, String>();$double = new HashMap<String, Double>();$long = new HashMap<String, Long>();$byte = new HashMap<String, Byte>();$short = new HashMap<String, Short>();$boolean = new HashMap<String, Boolean>();f.close();}}loaded = true;  // 初始载入完成}catch (Exception e){e.printStackTrace();}}/** 清除游戏数据 */public static void reset(){// 清除已有数据if ($object != null) $object.clear();if ($float != null) $float.clear();if ($int != null) $int.clear();if ($string != null) $string.clear();if ($double != null) $double.clear();if ($long != null) $long.clear();if ($byte != null) $byte.clear();if ($short != null) $short.clear();if ($boolean != null) $boolean.clear();if ($object == null) $object = new HashMap<String, Object>();if ($float == null) $float = new HashMap<String, Float>();if ($int == null) $int = new HashMap<String, Integer>();if ($string == null) $string = new HashMap<String, String>();if ($double == null) $double = new HashMap<String, Double>();if ($long == null) $long = new HashMap<String, Long>();if ($byte == null) $byte = new HashMap<String, Byte>();if ($short == null) $short = new HashMap<String, Short>();if ($boolean == null) $boolean = new HashMap<String, Boolean>();save(); // 保存空数据到文件}// --------------------------存储、读取-------------------------------------------/** 数据存储，将数据value加密后，按键值Key存储至HashMap和数据文件中 */public static void saveData(String Key, String value){saveData2HashMap(Key, value);save();                             // 保存数据到文件}/** 数据存储，将数据value加密后，按键值Key存储至HashMap中 */public static void saveData2HashMap(String Key, String value){if ($string == null) load();        // 初始化Key = Encryption(Key, 33741);       // 加密键名value = Encryption(value, 50413);   // 加密保存数据$string.put(Key, value);            // 本地数据保存}/** 数据读取，读取指定键值的数据，并解密，无则返回空串 "" */public static String readData(String Key){if ($string == null) load();            // 从文件读取数据，或初始化Key = Encryption(Key, 33741);           // 加密键名String value = "";if ($string.containsKey(Key)){value = $string.get(Key);           // 获取数据value = Encryption(value, -50413);  // 解密串}return value;}/** 加密或解密字符串，change加密、-change解密 */public static String Encryption(String str, int change){if (str.equals("") || str == null) return "";   // 空串不加密short sign = 1;if (change < 0){sign = -1;change *= -1;}int num = 0;int tmp;byte[] bytes = str.getBytes();for (int i = 0; i < bytes.length; i++){if (num == 0) num = change;// 限定在[0,127]之间tmp = bytes[i] + sign * (num % 3);if (tmp > 127) tmp -= 127;if (tmp < 0) tmp += 127;bytes[i] = (byte) tmp;num /= 3;}str = new String(bytes);return new String(bytes);}}

/** 读取指定的文件为字符串，如 resource/系统数据类型.txt */public static String ToString(String pathName){try{File file = new File(pathName);if (!file.exists()) file.createNewFile();    // 若文件不存在，则新建FileInputStream f = new FileInputStream(file);      // 从文件创建一个输入流byte[] tmp = new byte[f.available()];// 读取输入流中的数据f.read(tmp);String data = new String(tmp, "GB2312");// 转化为字符串return data;}catch (Exception e){return "";}}