java使用MD5生成摘要

/**
 * 对value进行hash处理
 * @return hash处理结果
 */
public static String digest(String input){
    int length = 32;
    try {
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] messageDigest = md.digest(input.getBytes());
        BigInteger no = new BigInteger(1, messageDigest);
        String hash = no.toString(16);
        while (hash.length() < length) {
            hash = MessageFormat.format("0{0}", hash);
        }
        return hash;
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    }
    return null;
}