MD5加密工具类

public class MD5Utils {
    /**
     * MD5加密
     */
        private static char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'A', 'B', 'C', 'D', 'E', 'F'};
        public static final String MD5Encrpytion(String source) {
            try {
                byte[] strTemp = source.getBytes(Charset.forName("UTF-8"));
                MessageDigest mdTemp = MessageDigest.getInstance("MD5");
                mdTemp.update(strTemp);
                byte[] md = mdTemp.digest();
                int j = md.length;
                char[] str = new char[j * 2];
                int k = 0;
                for (int i = 0; i < j; ++i) {
                    byte byte0 = md[i];
                    str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)];
                    str[(k++)] = hexDigits[(byte0 & 0xF)];
                }
                for (int m = 0; m < str.length; ++m) {
                    if ((str[m] >= 'a') && (str[m] <= 'z')) {
                        str[m] = (char) (str[m] - ' ');
                    }
                }
                return new String(str);
            } catch (Exception e) {
            }
            return null;
        }
    }