MD5加密

因为用到所以就写了个加密的方法
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    /**
     * MD5加密
     *
     * @param str
     * @return
     */
    public static String md5(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes("UTF8"));
            byte s[] = md.digest();
            String result = "";
            for (int i = 0; i < s.length; i++) {
                result += Integer.toHexString((0x000000FF & s[i]) | 0xFFFFFF00)
                        .substring(6);
            }
            return result;
        } catch (Exception e) {
            System.err.toString();
            return null;
        }
    }