C#.NET动手开发域名抢注前检测工具。

1	`demo:下载 <a href="http://www.kuaipan.cn/file/id_19288762550855653.html"` `rel="noopener nofollow">http://www.kuaipan.cn/file/id_19288762550855653.html</a>`

1	`相信院子里很多朋友都有过抢注域名的经历，去官方网站查询一些特殊域名是否已经被注册。比如喜欢找4个字母或者4个数字的朋友肯定去查询过。最近小弟也有这个需求。但是一个一个去查询很麻烦。而且想的肯定都不全面。于是我做了个小工具。暂且起名叫域名检测工具。他可以扫描出来你事先设置的规则下所有可注册域名列表。`

废话不多说，先上图

可以看到前边有个选项框。可以选择纯数字，纯字母或者数字字母混合类型的域名。第二个配置是域名长度。第三个配置是域名结尾。

本来我是想把第三个配置也就是域名结尾部分取消。让系统自动去检测常用域名后缀下的所有可注册域名。但是由于本人正则太烂。写不出来匹配规则。暂且就这样了！

界面就这样了。。下边上代码：

域名类型选择框的数据我目前是写死的。在Load事件里边加载的。代码如下：

 private void Main_Load(object sender, EventArgs e)
        {
            IList<DoMailType> list = new List<DoMailType>();
            list.Add(new DoMailType() { TID = 1, TName = "数字", TDescription = "纯数字" });
            list.Add(new DoMailType() { TID = 2, TName = "字母", TDescription = "纯字母" });
            list.Add(new DoMailType() { TID = 3, TName = "混合", TDescription = "字母和数字混合" });

            cmbDoMailType.DataSource = list;

            cmbDoMailType.ValueMember = "TID";
            cmbDoMailType.DisplayMember = "TName";
        }

 /// <summary>
    /// 域名类别
    /// </summary>
    public class DoMailType
    {
        /// <summary>
        /// 类别ID
        /// </summary>
        public int TID { get; set; }
        /// <summary>
        /// 类别名称
        /// </summary>
        public string TName { get; set; }
        /// <summary>
        /// 类别说明
        /// </summary>
        public string TDescription { get; set; }
    }

然后是开始扫描按钮。这个按钮事件也很简单。。他只是启动一个 timer控件。代码如下：

 private void btnStart_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            btnStart.Enabled = false;
            btnEnd.Enabled = true;
        }

 private void timer1_Tick(object sender, EventArgs e)
        {
            CheckResult();
        }

CheckResult() 方法也比较简单。首先我是用个抓包工具。点击查询之后通过抓包工具查看它像服务器发送的请求。都是GET的。方法入下：

private void CheckResult()
        {
            try
            {
                string lastStr;
                string url;
                string validateCode;
                GetUrl(out lastStr, out url, out validateCode);
             
                HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);
                httpRequest.Timeout = 2000;
                httpRequest.Method = "GET";
                HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
                StreamReader sr = new StreamReader(httpResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("gb2312"));
                string result = sr.ReadToEnd();

                if (!result.Contains("(已被注册)"))
                {
                    Log.WriteLog("www." + validateCode + lastStr);
                    if (this.textBox1.Text != "")
                    {
                        this.textBox1.Text += "\r\n";
                    }
                    this.textBox1.Text += "www." + validateCode + lastStr;

                }

                textBox1.Focus();
                textBox1.Select(textBox1.Text.Length, 0);
                textBox1.ScrollToCaret();

                sr.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                this.timer1.Enabled = false;
            }
        }

        private void GetUrl(out string lastStr, out string url, out string validateCode)
        {
            int type = Convert.ToInt32(cmbDoMailType.SelectedValue);
            int size = Convert.ToInt32(this.txtSize.Text.Trim());
            lastStr = this.txtLastStr.Text.Trim();
            //string url = "http://www.now.cn/whois/nowcheck.net?query={0}&Submit22=%D4%D9%B4%CE%B2%E9%D1%AF&blog=&domain%5B%5D=.com&domain%5B%5D=.net&domain%5B%5D=.cn&domain%5B%5D=.com.cn&domain%5B%5D=.net.cn";
            url = "http://www.now.cn/whois/nowcheck.net?query={0}&Submit22=%D4%D9%B4%CE%B2%E9%D1%AF&blog=&domain%5B%5D={1}";
            switch (type)
            {
                case 1://数字
                    validateCode = CrateNumber(size);
                    break;
                case 2://字母
                    validateCode = CrateLetter(size);
                    break;
                case 3:
                    validateCode = CreateLetterAndNumber(size);
                    break;
                default:
                    //1
                    validateCode = CrateNumber(size);
                    break;
            }
            //validateCode = "269";
            url = string.Format(url, validateCode, lastStr);
        }
        /// <summary>
        /// 创建随机数字
        /// </summary>
        /// <param name="size"></param>
        /// <returns></returns>
        private static string CrateNumber(int size)
        {
            string validateCode;
            char[] chars = "023456789".ToCharArray();
            Random random = new Random();
            validateCode = string.Empty;
            for (int i = 0; i < size; i++)
            {
                char rc = chars[random.Next(0, chars.Length)];
                if (validateCode.IndexOf(rc) > -1)
                {
                    i--;
                    continue;
                }
                validateCode += rc;
            }
            return validateCode;
        }
        /// <summary>
        /// 创建随机字母
        /// </summary>
        /// <param name="size"></param>
        /// <returns></returns>
        private static string CrateLetter(int size)
        {
            string validateCode;
            char[] chars = "abcdefghighlmnopqrstuvwxyz".ToCharArray();
            Random random = new Random();
            validateCode = string.Empty;
            for (int i = 0; i < size; i++)
            {
                char rc = chars[random.Next(0, chars.Length)];
                if (validateCode.IndexOf(rc) > -1)
                {
                    i--;
                    continue;
                }
                validateCode += rc;
            }
            return validateCode;
        }
        /// <summary>
        /// 创建随机混合字符串
        /// </summary>
        /// <param name="size"></param>
        /// <returns></returns>
        private static string CreateLetterAndNumber(int size)
        {
            string validateCode;
            char[] chars = "abcdefghighlmnopqrstuvwxyz023456789".ToCharArray();
            Random random = new Random();
            validateCode = string.Empty;
            for (int i = 0; i < size; i++)
            {
                char rc = chars[random.Next(0, chars.Length)];
                if (validateCode.IndexOf(rc) > -1)
                {
                    i--;
                    continue;
                }
                validateCode += rc;
            }
            return validateCode;
        }