登陆带验证码

<script>--脚本代码 function getVCode() { var vcode = document.getElementById("vcode");--获取元素 vcode.src = "ValidateCode.ashx?i="+Math.random(); } </script>

<form id="form1" runat="server"> <div id="login"> <div class="title">用户登录</div> <div class="content"> <p>用户名：<input type="text" name="txtuser" class="txt" /></p> <p>密&nbsp;&nbsp;&nbsp;码：<input type="password" name="txtpwd" class="txt" /></p>

<p>验证码：<input type="text" name="txtvcode" class="txt" /> <img src="ValidateCode.ashx" id="vcode" align="middle" alt="看不清，换一张" οnclick="getVCode()" /><%--后台生成的图片--%> <a href="javascript:getVCode()" class="hyz">换一张</a> </p>

<p><input type="submit" class="sub" value="登录" /></p> </div> </div> </form>

 

 

using System.Drawing;using System.Text;using System.IO;using System.Drawing.Drawing2D;using System.Web.SessionState;

public class ValidateCode : IHttpHandler,IRequiresSessionState {

public void ProcessRequest(HttpContext context) { Random random = new Random(); context.Response.ContentType = "text/plain"; //context.Response.Write("Hello World"); //1.创建画板或画布 Bitmap bitmap = new Bitmap(60, 30); //2.创建画图工具 Graphics g = Graphics.FromImage(bitmap);

//设置画布背景颜色 g.Clear(Color.White); //设置边框 g.DrawRectangle(new Pen(Color.Red), 0, 0, 59, 29); //设置像干扰素点，噪音点 for (int i = 0; i < 100; i++) { int x1 = random.Next(bitmap.Width); int y1 = random.Next(bitmap.Height); bitmap.SetPixel(x1, y1, Color.Brown); } //设置干扰折线，噪音线 for (int i = 0; i < 25; i++) { int x1 = random.Next(bitmap.Width); int x2 = random.Next(bitmap.Width); int y1 = random.Next(bitmap.Height); int y2 = random.Next(bitmap.Height); g.DrawLine(new Pen(Color.Green), x1, y1, x2, y2); } //3.设置画图内容 string s = "0123456789abcdefghjkmnpkrstuvwxyz"; StringBuilder builder = new StringBuilder(); for (int i = 0; i < 4; i++) { int index= random.Next(s.Length); builder.Append(s[index]); } context.Session["vcode"] = builder; //4.画图 g.DrawString(builder.ToString(), new Font("宋体", 18),new LinearGradientBrush(new Rectangle(0,0,bitmap.Width,bitmap.Height),Color.Blue,Color.Red,1.2f),0,0); //5.保存 //string path=context.Request.MapPath("image"); //bitmap.Save(path + "/" + "11.jpg"); //context.Response.Write("生成成功！"); bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); }

public bool IsReusable { get { return false; } } }

转载于:https://www.cnblogs.com/ZkbFighting/p/8143633.html

相关资源：python模拟登录带验证码的网站demo