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hexString与UTF-8字符串互转

我阿霆哥 2022-02-21 阅读 65
android

给一个字符串“我的iPhone”,转hexString:

String.valueOf(HexEncoding.encode("我的iPhone".getBytes(StandardCharsets.UTF_8)))  // = E68891E79A846950686F6E65

将hexString 转回String “我的iPhone”:

    new String(hexStringToBytes("E68891E79A846950686F6E65"),StandardCharsets.UTF_8) //=“我的iPhone”

    public static byte[] hexStringToBytes(String hexString) {
        if (hexString==null) {
            return null;
        }
        hexString = hexString.toLowerCase();
        final byte[] byteArray = new byte[hexString.length() >> 1];
        int index = 0;
        for (int i = 0; i < hexString.length(); i++) {
            if (index > hexString.length() - 1) {
                return byteArray;
            }
            byte highDit = (byte) (Character.digit(hexString.charAt(index), 16) & 0xFF);
            byte lowDit = (byte) (Character.digit(hexString.charAt(index + 1), 16) & 0xFF);
            byteArray[i] = (byte) (highDit << 4 | lowDit);
            index += 2;
        }
        return byteArray;
    }

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