MD5,sha1加密工具类

/**     * 利用MD5加密     * @return String  加密后的字符串     * @param str  待加密的字符串     * @throws NoSuchAlgorithmException   异常     * @throws UnsupportedEncodingException  异常     */    @SuppressWarnings("finally")    public String Md5(String str) {        String newstr = "";        //1.确定计算方式        MessageDigest md5;        try {            md5 = MessageDigest.getInstance("MD5");            BASE64Encoder base64Encoder=new BASE64Encoder();            //2。加密后的字符串            newstr = base64Encoder.encode(md5.digest(str.getBytes("utf-8")));        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }finally{            return newstr;        }    }

/**     * sha1加密     * @param str 返回加密字符串     * @return     */    public static String getSha1(String str) {        if (str == null || str.length() == 0) {            return null;        }        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };        try {            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");            mdTemp.update(str.getBytes("UTF-8"));            byte[] md = mdTemp.digest();            int j = md.length;            char buf[] = new char[j * 2];            int k = 0;            for (int i = 0; i < j; i++) {                byte byte0 = md[i];                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];                buf[k++] = hexDigits[byte0 & 0xf];            }            return new String(buf);        } catch (Exception e) {            return null;        }    }