新建类ValidateCode
引用
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
public class ValidateCode { public ValidateCode() { } /// <summary> /// 验证码的最大长度 /// </summary> public int MaxLength { get { return 10; } } /// <summary> /// 验证码的最小长度 /// </summary> public int MinLength { get { return 1; } } /// <summary> /// 生成验证码 /// </summary> /// <param name="length">指定验证码的长度</param> /// <returns></returns> public string CreateValidateCode(int length) { int[] randMembers = new int[length]; int[] validateNums = new int[length]; string validateNumberStr = ""; //生成起始序列值 int seekSeek = unchecked((int)DateTime.Now.Ticks); Random seekRand = new Random(seekSeek); int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000); int[] seeks = new int[length]; for (int i = 0; i < length; i++) { beginSeek += 10000; seeks[i] = beginSeek; } //生成随机数字 for (int i = 0; i < length; i++) { Random rand = new Random(seeks[i]); int pownum = 1 * (int)Math.Pow(10, length); randMembers[i] = rand.Next(pownum, Int32.MaxValue); } //抽取随机数字 for (int i = 0; i < length; i++) { string numStr = randMembers[i].ToString(); int numLength = numStr.Length; Random rand = new Random(); int numPosition = rand.Next(0, numLength - 1); validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); } //生成验证码 for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } /// <summary> /// 得到验证码图片的长度 /// </summary> /// <param name="validateNumLength">验证码的长度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// <summary> /// 得到验证码的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } /// <summary> /// C# MVC 升级版创建验证码的图片 /// </summary> /// <param name="validateCode">验证码</param> public byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); Graphics g = Graphics.FromImage(image); try { //生成随机生成器 Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的干扰线 for (int i = 0; i < 25; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(validateCode, font, brush, 3, 2); //画图片的前景干扰点 for (int i = 0; i < 100; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); //保存图片数据 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //输出图片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } } }
视图
@using (Ajax.BeginForm("index", "Home", new { }, new AjaxOptions() { HttpMethod = "Post", OnSuccess = "AfterAdd" }, new { id = "frmSet" })) { <div class="en_01"> <input placeholder="用户名" name="UserID" type="text" > </div> <div class="en_01"> <input placeholder="密码" type="password" name="password" > </div> <div class="en_02"> <input placeholder="验证码" type="text" name="CheckCode" ><img src="/Home/GetCodeImage" id="CodeImage" alt="看不清?换一张" onclick="this.src=‘/Home/GetCodeImage?GUID=‘+ new Date().getTime();"> </div> <div class="en_03"> <input value="登录" type="submit"> </div> } <script> function AfterAdd(result) { if (result.isOk == "ok") { window.top.location.href = result.goUrl; } else { $("#CodeImage").attr("src", "/Home/GetCodeImage?GUID=" + new Date().getTime()); alert(result.msg); } } </script>
控制器
//会员登录 [HttpPost] public ActionResult Index(FormCollection form) { string UserID =Tool.GetSafeSqlandHtml(Request["UserID"]); string pwd = Tool.GetSafeSqlandHtml(Request["password"]); string CheckCode =Tool.GetSafeSqlandHtml( Request["CheckCode"]); if (Session["ValidateCode"] == null || CheckCode != Session["ValidateCode"].ToString()) { return Json(new { isOk = "erro", msg = "验证码错误" }); } if (string.IsNullOrEmpty(UserID) || string.IsNullOrEmpty(pwd)) { return Json(new { isOk = "erro", msg = "请输入用户名和密码" }); } string reMsg = ""; if (BLL.Member.UserLogin(UserID, pwd, true, out reMsg)) { const string goUrl = "/Default/Index"; return Json(new { isOk = "ok", goUrl = goUrl }); } return Json(new { isOk = "erro", msg = reMsg }); } //生成验证码图片 public ActionResult GetCodeImage() { ValidateCode vCode = new ValidateCode(); string code = vCode.CreateValidateCode(5); Session["ValidateCode"] = code; byte[] bytes = vCode.CreateValidateGraphic(code); return File(bytes, @"image/jpeg"); }
时间: 2024-11-05 21:59:33