MD5鹽值加密 工具類及獲取隨機鹽

 private String MD5(String sourceStr){
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuilder buf = new StringBuilder();
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0){
                    i += 256;}
                if (i < 16){
                    buf.append("0");}
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString().substring(8, 24);

        } catch (NoSuchAlgorithmException e) {
            logger.error("MD5加密失敗",e);
        }
        return result;
    }



/*獲取隨機鹽*/
        String saltkey = Base64.encodeBase64String(RandomStringUtils.random(5).getBytes());