md5加密

    public static String encode(String str)
    {
        String code=null;
        try {
            MessageDigest digest=MessageDigest.getInstance("MD5");
            code = new String(digest.digest(str.getBytes()));
            System.out.println(code);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return code;
    }