MD5加密字符串

public static String md5(String string) {

    byte[] hash;

    try {

        hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));

    } catch (NoSuchAlgorithmException e) {

        throw new RuntimeException("Huh, MD5 should be supported?", e);

    } catch (UnsupportedEncodingException e) {

        throw new RuntimeException("Huh, UTF-8 should be supported?", e);

    }

    StringBuilder hex = new StringBuilder(hash.length * 2);

    for (byte b : hash) {

        if ((b & 0xFF) < 0x10) hex.append("0");

        hex.append(Integer.toHexString(b & 0xFF));

    }

    return hex.toString();

}