MD5 工具类

public final class MD5 {

    public static String encrypt(String strSrc) {

        try {

            char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',

                    '9', 'a', 'b', 'c', 'd', 'e', 'f' };

            byte[] bytes = strSrc.getBytes();

            MessageDigest md = MessageDigest.getInstance("MD5");

            md.update(bytes);

            bytes = md.digest();

            int j = bytes.length;

            char[] chars = new char[j * 2];

            int k = 0;

            for (int i = 0; i < bytes.length; i++) {

                byte b = bytes[i];

                chars[k++] = hexChars[b >>> 4 & 0xf];

                chars[k++] = hexChars[b & 0xf];

            }

            return new String(chars);

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

            throw new RuntimeException("MD5加密出错！！+" + e);

        }

    }

}