隨手記_C#驗證碼


前言

最近在網上偶然看見一個驗證碼,覺得很有意思,於是搜了下,是使用第三方實現的,先看效果:

 

 

總體來說效果還是可以的,官方提供的SDK也比較詳細,可配置性很高。在這里在簡單啰嗦幾句使用方式:

使用步驟

①進入官網下載sdk接口→ http://www.geetest.com/install/ ,因為小弟是做C#的,所以此處選擇C#,具體選擇看各位大佬所用語言決定~

②第二步,獲取代碼,訪問紅框所示地址,下載demo。

 

 

 

③運行Demo(src文件夾里面的GeetestSDK項目)

 

④移植到自己項目中

 ⑴先將上述src文件拷貝到本地項目根目錄下面

⑵然后打開本地項目並添加現有項目,將GeetestSDK添加進來

⑶在本地項目中添加引用

⑷View中新建容器存放驗證碼

  @using (Html.BeginForm())
    {
        <div>
            用戶名:
        </div>
        <div>
            @Html.TextBoxFor(model => model.Name)
        </div>
        <div>
            密碼:
        </div>
        <div>
            @Html.PasswordFor(model => model.Age)
        </div>
        <div>
            驗證碼:<div id="captcha"></div> @*新增的存放驗證碼的容器*@
        </div>
        <div>
            <input type="submit" value="登陸" />
        </div>
    }

界面入下圖:

⑸新建一個控制器(GetcaptchaController)和分部視圖(Index)用於顯示請求到的頁面

控制器代碼

     public ActionResult Index()
        {
            Response.ContentType = "application/json";
            Response.Write(getCaptcha());
            Response.End();
            return View();
        }
        private String getCaptcha()
        {
            GeetestLib geetest = new GeetestLib(GeetestConfig.publicKey, GeetestConfig.privateKey);
            String userID = "ShowTime";
            Byte gtServerStatus = geetest.preProcess(userID);
            Session[GeetestLib.gtServerStatusSessionKey] = gtServerStatus;
            Session["userID"] = userID;
            return geetest.getResponseStr();
        }

其中,GeetestConfig是新建的一個類,里面代碼如下:

 public const String publicKey = "b46d1900d0a894591916ea94ea91bd2c";
 public const String privateKey = "36fc3fe98530eea08dfc6ce76e3d24c4";

注:需要引入此命名空間 using GeetestSDK;

Index視圖里面放一個空div就行,代碼如下:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>
<body>
    <form id="form1">
        <div>

        </div>
    </form>
</body>
</html>

⑹使用Ajax在登錄頁加載分部視圖Index用於顯示驗證碼

     var handler = function (captchaObj) {
            //將驗證碼加到id為captcha的元素里
            captchaObj.appendTo("#captcha");
        };
        //極驗
        $.ajax({
            // 獲取id,challenge,success(是否啟用failback)
            url: "/Getcaptcha/Index",
            type: "get",
            dataType: "json", // 使用jsonp格式
            success: function (data) {
                // 使用initGeetest接口
                // 參數1:配置參數,與創建Geetest實例時接受的參數一致
                // 參數2:回調,回調的第一個參數驗證碼對象,之后可以使用它做appendTo之類的事件
                initGeetest({
                    gt: data.gt,
                    challenge: data.challenge,
                    product: "float", // 產品形式
                    offline: !data.success
                }, handler);
            }
        });

注:需在頭部引入Jquery1.9可直接引入下面兩個js

<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script src="http://static.geetest.com/static/tools/gt.js"></script>

⑺在登陸按鈕中判斷驗證是否通過,登陸的Index代碼如下:

     [HttpPost]
        public ActionResult Index(Models.HelloModel loginModel)
        {
            GeetestLib geetest = new GeetestLib(GeetestConfig.publicKey, GeetestConfig.privateKey);
            Byte gt_server_status_code = (Byte)Session[GeetestLib.gtServerStatusSessionKey];
            String userID = (String)Session["userID"];
            int result = 0;
            String challenge = Request.Form.Get(GeetestLib.fnGeetestChallenge);
            String validate = Request.Form.Get(GeetestLib.fnGeetestValidate);
            String seccode = Request.Form.Get(GeetestLib.fnGeetestSeccode);
            if (gt_server_status_code == 1) result = geetest.enhencedValidateRequest(challenge, validate, seccode, userID);
            else result = geetest.failbackValidateRequest(challenge, validate, seccode);
            if (result == 1) Response.Write("success");//返回1則表明驗證通過,可跳轉頁面或者做其他處理
            else Response.Write("fail");
            return View();
        }

運行效果

另:官方Demo下載下來是使用的嵌入式的驗證效果,要更改此效果,可參考客戶端SDK參數來配置

鏈接→  http://www.geetest.com/install/sections/idx-client-sdk.html#id19

 

Demo下載

 鏈接:  點我下載  密碼:63pd

 

常規驗證碼

最終效果

HTML

 <div style="MARGIN-TOP: 12px; margin-left: 0px; width: 130px; float: left;" id="checkInputLine" class="loginFormIpt showPlaceholder">
                        <input id="checkInput" class="loginFormCheckCodeInput" title='Please enter the contents of the right picture' tabindex="4" maxlength="5" require="True" title='驗證碼' placeholder="驗證碼" type="text" name="vcode" />
                    </div>
                    <!-- 請輸入驗證碼-->
                    &nbsp;&nbsp;
                         <img id="checkloing" src="/Home/VCode" class="loginFormCheckCodeImg" onclick="reloadcode('/Home/VCode')" title="Can not see clearly, change one." />

Ajax 請求如下:

//刷新驗證碼
        function reloadcode(srcStr) {
            document.getElementById("checkloing").src = srcStr + "?rand=" + Math.random();
        }
        var checkInfo = "";
        //檢查數據
        function Check() {
            checkInfo = "";
            //檢查不能為空的數據
            $("input[Require='True']").each(function (i) {
                var tmpName = $(this).attr("name");
                var strVal = $(this).val();
                strVal = strVal.replace(/\s/g, "")
                if (!strVal)
                    checkInfo += $(this).attr("placeholder") + "不能為空。<br/>";
            });
            if (checkInfo) return false;
            return true;
        }
        $(function () {
            $("#btnLogin").click(function () {
                var ii = layer.load();
                if (!Check()) {
                    layer.close(ii);
                    layer.msg('' + checkInfo, function () { });
                    return;
                }
                $("#loadingDiv").show();
                $.ajax({
                    url: "/Home/Index",
                    type: "post",
                    data: "userName=" + $("#tbUserName").val() + "&pwd=" + $("#tbPWD").val() + "&code=" + $("#checkInput").val(),
                    success: function (data) {
                        debugger;
                        if (data.Result == "0") {
                            layer.close(ii);
                            layer.msg('' + data.MSG);
                            return;
                        } else if (data.Result == "1") {
                            layer.close(ii);
                            window.location.href = "/Home/Index";
                        }
                    },
                    error: function (data) {
                        layer.close(ii);
                        layer.msg('' + data.MSG);
                    }
                });
            });
        });

其中:

 layer.msg('' + data.MSG); 這種彈框方式使用了layer彈出層 

 

Home控制器里面的VCde方法就是獲取到最新的驗證碼,代碼如下:

 [AllowAnonymous]//跳過登陸驗證
        public ActionResult VCode()
        {
            VerificationCodeHelper vcode = new VerificationCodeHelper();
            string codeStr = vcode.GetRandomCode();
            if (!string.IsNullOrEmpty(codeStr))
            {
                byte[] arrImg = vcode.GetVCode(codeStr);
                Session["code"] = codeStr;
                return File(arrImg, "image/gif");
            }
            else
            {
                return RedirectToAction("/Login/VCode?rand=" + Guid.NewGuid().ToString().Substring(1, 10), "image/jpeg");
            }
        }

其中 VerificationCodeHelper  就是封裝好的 生成驗證碼的類,直接使用就行,代碼如下:

  public class VerificationCodeHelper
    {
        private static Color BackColor = Color.White;
        private static int Width = 62;
        private static int Height = 21;
        private Random _random;
        // private string _code;



        private int _brushNameIndex;

        public byte[] GetVCode(string codeStr)
        {
            _random = new Random();
            using (Bitmap img = new Bitmap(Width, Height))
            {
                // _code = GetRandomCode();
                // System.Web.HttpContext.Current.Session["vcode"] = _code;
                using (Graphics g = Graphics.FromImage(img))
                {
                    g.Clear(Color.White);//繪畫背景顏色

                    Paint_Text(g, codeStr);// 繪畫文字
                    // g.DrawString(strCode, new Font("微軟雅黑", 15), Brushes.Blue, new PointF(5, 2));// 繪畫文字
                    Paint_TextStain(img);// 繪畫噪音點
                    g.DrawRectangle(Pens.DarkGray, 0, 0, Width - 1, Height - 1);//繪畫邊框
                    using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                    {
                        //將圖片 保存到內存流中
                        img.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                        //將內存流 里的 數據  轉成 byte 數組 返回
                        return ms.ToArray();
                    }
                }
            }

        }

        /// <summary>
        /// 繪畫文字
        /// </summary>
        /// <param name="g"></param>
        private void Paint_Text(Graphics g, string code)
        {
            g.DrawString(code, GetFont(), GetBrush(), 3, 1);
        }

        /// <summary>
        /// 繪畫文字噪音點
        /// </summary>
        /// <param name="g"></param>
        private void Paint_TextStain(Bitmap b)
        {
            string[] BrushName = new string[] {    "OliveDrab",
                                                  "ForestGreen",
                                                  "DarkCyan",
                                                  "LightSlateGray",
                                                  "RoyalBlue",
                                                  "SlateBlue",
                                                  "DarkViolet",
                                                  "MediumVioletRed",
                                                  "IndianRed",
                                                  "Firebrick",
                                                  "Chocolate",
                                                  "Peru",
                                                  " enrod"
                                             };

            for (int n = 0; n < 30; n++)
            {
                int x = _random.Next(Width);
                int y = _random.Next(Height);
                b.SetPixel(x, y, Color.FromName(BrushName[_brushNameIndex]));

            }

        }
        /// <summary>
        /// 隨機取一個字體
        /// </summary>
        /// <returns></returns>
        private Font GetFont()
        {
            string[] FontItems = new string[]{   "Arial", 
                                                  "Helvetica", 
                                                  "Geneva", 
                                                  "sans-serif", 
                                                  "Verdana"
                                              };

            int fontIndex = _random.Next(0, FontItems.Length);
            FontStyle fontStyle = GetFontStyle(_random.Next(0, 2));
            return new Font(FontItems[fontIndex], 12, fontStyle);
        }
        /**/
        /**/
        /**/
        /// <summary>
        /// 隨機取一個筆刷
        /// </summary>
        /// <returns></returns>
        private Brush GetBrush()
        {
            Brush[] BrushItems = new Brush[]{     Brushes.OliveDrab,
                                                  Brushes.ForestGreen,
                                                  Brushes.DarkCyan,
                                                  Brushes.LightSlateGray,
                                                  Brushes.RoyalBlue,
                                                  Brushes.SlateBlue,
                                                  Brushes.DarkViolet,
                                                  Brushes.MediumVioletRed,
                                                  Brushes.IndianRed,
                                                  Brushes.Firebrick,
                                                  Brushes.Chocolate,
                                                  Brushes.Peru,
                                                  Brushes.Goldenrod
                                            };

            int brushIndex = _random.Next(0, BrushItems.Length);
            _brushNameIndex = brushIndex;
            return BrushItems[brushIndex];
        }
        /// <summary>
        /// 繪畫背景顏色
        /// </summary>
        /// <param name="g"></param>
        private void Paint_Background(Graphics g)
        {
            g.Clear(BackColor);
        }
        /**/
        /**/
        /**/
        /// <summary>
        /// 取一個字體的樣式
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        private FontStyle GetFontStyle(int index)
        {
            switch (index)
            {
                case 0:
                    return FontStyle.Bold;
                case 1:
                    return FontStyle.Italic;
                default:
                    return FontStyle.Regular;
            }
        }

        /// <summary>
        /// 取得一個 4 位的隨機碼
        /// </summary>
        /// <returns></returns>
        public string GetRandomCode()
        {
            return Guid.NewGuid().ToString().Substring(0, 5);
        }
    }
View Code

注意,初次加載頁面的時候,將拿到的code存入Session中,點擊登錄的時候,將用戶輸入的驗證碼傳入后台,進行比對驗證是否和Session中的驗證碼相同,如果相同,則允許登錄,否則,驗證碼錯誤

參考Action如下:

  [HttpPost]
        public ActionResult Index(string userName, string pwd)
        {
            try
            {
                string vccode = Request.Form["code"];
                if (string.IsNullOrEmpty(vccode))
                    return Json(new { Result = "0", MSG = "請填寫驗證碼" });
                else
                {
                    if (Session["code"] == null)
                        return Json(new { Result = "0", MSG = "驗證碼已過期,請點擊刷新驗證碼" });
                    string str = Session["code"].ToString();
                    str = str.ToLower();
                    vccode = vccode.ToLower();
                    if (str != vccode)
                        return Json(new { Result = "0", MSG = "驗證碼填寫錯誤!" });
                    else
                    {
                        Session["code"] = null;
                    }
                    if (string.IsNullOrEmpty(userName) || string.IsNullOrEmpty(pwd))
                    {
                        return Json(new { Result = "0", MSG = "用戶或密碼沒有填寫" });
                    }
                    //查詢此用戶
                    #region 查詢此用戶
                    List<Models.MySqlUser> adminml = new List<Models.MySqlUser>();
                    Models.MySqlUser admin = new Models.MySqlUser();
                    adminml = IBCodeBll.GetModelList(userName.Trim());

                    if (adminml.Count > 0)
                    {
                        if (!adminml[0].password.ToLower().Equals(Maticsoft.Common.DEncrypt.DESEncrypt.Encrypt2(pwd.Trim()).ToLower()))
                        {
                            return Json(new { Result = "0", MSG = "密碼錯誤!" });
                        }
                    }
                    else
                    {
                        return Json(new { Result = "0", MSG = "用戶不在在!" });
                    }
                    #endregion
                    Session["UserName"] = userName.Trim().ToString();
                    return Json(new { Result = "1", MSG = "登錄成功!" });
                }
            }
            catch (Exception ex)
            {

                return Json(new { Result = "0", MSG = ex.Message });
            }
        }

 

      End!


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