简单的加密解密类

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public class KeyTool {

    private static int[] src = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

    private static int[] des = { 9, 6, 8, 2, 3, 5, 1, 4, 0, 7 };

    public static String encrypt(String originalNum) {

        char[] digitNum = originalNum.toCharArray();
        int length = digitNum.length;
        String mapNum = "";
        for (int i = 0; i < length; i++) {
            int index = Integer.parseInt(String.valueOf(digitNum[i]));
            mapNum += String.valueOf(des[index]);
        }
        return mapNum;
    }

    public static String dEncrypt(String originalNum) {

        char[] digitNum = originalNum.toCharArray();
        int length = digitNum.length;
        String mapNum = "";
        String decryptStr = "9682351407";
        for (int i = 0; i < length; i++) {
            int index = decryptStr.indexOf(String.valueOf(digitNum[i]));
            mapNum += String.valueOf(src[index]);
        }
        return mapNum;
    }

}