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C#登录页面验证码刷新
验证码生成页面 png.aspx
using System;using System.Collections.Generic;using System.Drawing;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace Maticsoft.Web.Admin{ public partial class png : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string checkCode = CreateRandomCode(4); Session["CheckCode"] = checkCode; CreateImage(checkCode); } private string CreateRandomCode(int codeCount) { // 函数功能:产生数字和字符混合的随机字符串 string allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; char[] allCharArray = allChar.ToCharArray(); string randomCode = ""; Random rand = new Random(); for (int i = 0; i < codeCount; i++) { int r = rand.Next(61); randomCode += allCharArray.GetValue(r); } return randomCode; } private void CreateImage(string checkCode) { // 生成图象验证码函数 int iwidth = (int)(checkCode.Length * 11.5); System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20); Graphics g = Graphics.FromImage(image); Font f = new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold); Brush b = new System.Drawing.SolidBrush(Color.Azure); //字母白色 //g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height); g.Clear(Color.Brown);//背景灰色 g.DrawString(checkCode, f, b, 3, 3); Pen blackPen = new Pen(Color.Black, 0); Random rand = new Random(); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose(); } }}
登录页面放入图片
<asp:Image ID="Image1" runat="server" ImageUrl="png.aspx" onclick="refresh(this, ‘png.aspx‘);"/>
js脚本
function refresh()
{
var url = "png.aspx?id=";
var r = Math.random() * 1000;
url = url + r;
document.all("Image1").src = http://www.mamicode.com/url;
document.all("LoI_txtVC").valuehttp://www.mamicode.com/= "";
document.all("LoI_txtVC").focus();
return false;
}</script>
登录判断验证码 TextBox3为验证码输入框
if (base.Session["CheckCode"] == null) { Page.ClientScript.RegisterStartupScript(Page.ClientScript.GetType(), "myscripts", "<script>alert(\"验证码已过期！\");</script>"); return; } if (TextBox3.Text != Session["CheckCode"].ToString()) { Page.ClientScript.RegisterStartupScript(Page.ClientScript.GetType(), "myscripts", "<script>alert(\"验证码不正确！\");</script>"); return; }
C#登录页面验证码刷新
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