Java MD5 加密

public static String md5(String string) {
    try {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        messageDigest.update(string.getBytes());
        StringBuilder builder = new StringBuilder();
        for (byte b1 : messageDigest.digest()) {
            int temp = b1;
            if (temp < 0) temp += 256;
            if (temp < 16) builder.append("0");
            builder.append(Integer.toHexString(temp));
        }
        return builder.toString();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return string;
}