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数据加密与保存

来源:程序员人生   发布时间:2015-03-20 09:19:48 阅读次数:2302次


//--------------------------------------------------------------------- // 1、加密算法: //--------------------------------------------------------------------- //加密或解密字符串,change加密、-change解密 public static String Encryption(String str, int change) { short sign = 1; if(change<0){ sign = ⑴; change *= ⑴; } 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); }

//--------------------------------------------------------------------- // 2、将数据保存到 LocalDB //--------------------------------------------------------------------- //保存加密串到LocalDB中 if(key == "Name1") { String data = "abcdefghijklmnopq..."; String info = Encryption(data, 7733171); //加密串 LocalDB.setString("Name1", info); //保存到LocalDB } //从LocalDB中,获得保存的数据 if(LocalDB.$string.containsKey("Name1")) { String info = LocalDB.$string.get("Name1"); //获得数据 info = Encryption(value, ⑺733171); //解密串 }

//=========================================================================================================== // 3、保存数据到文件 //=========================================================================================================== //类LocalDB.java import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.HashMap; import android.os.Environment; /** * 此类功能 * 1、保存数据到HashMap对象中 * 2、保存HashMap对象数据到文件 */ public class LocalDB { private static String fileName = "LocalDB.txt"; //用于保存数据的文件名 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用法以下: // $type.put(String key, Type value) //存储Type类型数据到$type,索引标识key 存储 // $type.get(Object key) //从$type中获得索引标识key的数据 获得 // $type.containsKey(Object key) //判断$type中是不是含有索引标识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 */ public static void save() { try { //有SD卡 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File file; FileOutputStream f; try { //取得SD卡路径 String pathString = Environment.getExternalStorageDirectory().getPath(); 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1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,获得保存的数据到静态对象中 -载入 */ @SuppressWarnings("unchecked") public static void Load() { try { //取得SD卡路径 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File file =null; FileInputStream f=null; try { String pathString = Environment.getExternalStorageDirectory().getPath(); 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1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(); } } } catch (Exception e) { e.printStackTrace(); } } }


2、拓展

//--------------------------------------------------------------- // 1、 // boolean数组数据转换为字符串,加密存储 //--------------------------------------------------------------- //加密flag为字符串 public static String setBooleans(boolean flag[][], int change) { String rewardInfo = ""; for(int i = 0; i < flag.length; i++) { for(int j = 0; j < flag[i].length; j++) { rewardInfo += (flag[i][j] ? "1" : "0") + (j == flag[i].length⑴ ? "" : ","); } rewardInfo += (i == flag.length⑴ ? "" : ";"); } String reward = DataEncryption.Encryption(rewardInfo, change); //加密串 return reward; }

//--------------------------------------------------------------------- // 2、将数据保存到 LocalDB //--------------------------------------------------------------------- //从LocalDB中,获得保存的数据 if(LocalDB.$string.containsKey("Name1")) { String info = LocalDB.$string.get("Name1"); boolean flag[][] = getBooleans(info, 7733171); //解密为布尔数组 for(int i=0; i< flag.length; i++) Treasure_box_form.flag[i] = flag[i]; //复制已有数据 } //保存加密串到LocalDB中 if(key == "Name1") { String reward = DataEncryption.$string.set(Treasure_box_form.flag, 7733171); //加密为字符串 LocalDB.setString("Name1", reward); }





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