标准JAVA MD5方法

https://blog.csdn.net/wangfei0904306/article/details/71565968

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不过是个MD5，网上随便搜了个，竟然时好时坏，真是误事，这个从系统里扒拉出来的，还比较靠谱

private String MD5(String s) {
    try {
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] bytes = md.digest(s.getBytes("utf-8"));
        return toHex(bytes);
    }
    catch (Exception e) {
        throw new RuntimeException(e);
    }
}

private static String toHex(byte[] bytes) {

    final char[] HEX_DIGITS = "0123456789ABCDEF".toCharArray();
    StringBuilder ret = new StringBuilder(bytes.length * 2);
    for (int i=0; i<bytes.length; i++) {
        ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
        ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
    }
    return ret.toString();
}