一般处理程序制作的验证码
一、新建一個ValidateCode.ashx文件
<%@ WebHandler Language="C#" Class="ValidateCode"Debug="true" %>
//Debug="true"是加上去的
using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.SessionState;//要使用Session必須使用命名空間里的接口IRequiresSessionState
public class ValidateCode : IHttpHandler,IRequiresSessionState{
????? public void ProcessRequest (HttpContext context) {
??????? context.Response.ContentType = "image/jpeg";
??????? //context.Response.Write("Hello World"+MakeRandomNum());測試生成隨機驗證碼
?? //創建驗證圖片
??? string vCode=MakeRandomNum();
??? context.Session["vcode"] = vCode;//給Session里寫驗證碼值
??? using (Bitmap img = new Bitmap(80,30))
????? {
?????? using (Graphics g = Graphics.FromImage(img))
??????? {
????????? g.DrawString(vCode,new Font("微軟雅黑",16),Brushes.White,10,2);
????????? img.Save(context.Response.OutputStream,ImageFormat.Jpeg);
???????? }
?????? }
????? }
??? //生成隨機驗證碼
??? public string MakeRandomNum()
??? {
??????? Random ran = new Random();
??????? string resNum = string.Empty;
??????? for (int i = 0; i < 4; i++)
??????? {
??????????? resNum += ran.Next(9).ToString();
??????? }
??????? return resNum;
??? }
????? public bool IsReusable {
??????? get {
??????????? return false;
???????????? }
?????? }
}
二、登陸頁面C05LoginBySession.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="C05LoginBySession.aspx.cs" Inherits="C05LoginBySession" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
??? <title></title>
</head>
<body>
??? <form id="form1" action="C05LoginBySession.aspx"method="post">
??? <input id="txtName"name="txtName"type="text"/><br/>
??? <input id="txtPwd"name="txtPwd"type="text"/><br/>
??? <input id="txtCode"name="txtCode"type="text"/><img src="ValidateCode.ashx"/><br/>
??? <input id="Submit1"type="submit"value="登陸"/>
??? <a href="Reg.aspx">注冊</a>
??? <input type="hidden"name="IsPostBack"value="1"/>
??? </form>
</body>
</html>
三、登陸頁面C05LoginBySession.aspx.cs? 到Session讀值判斷驗證碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class C05LoginBySession : System.Web.UI.Page
{
??? protected void Page_Load(object sender, EventArgs e)
??? {
??????? if (!string.IsNullOrEmpty(Request.Form["IsPostBack"]))
??????? {
??????????? string strCode=Request.Form["txtCode"];
??????????? if (!string.IsNullOrEmpty(strCode) && Session["vcode"] != null && strCode == Session["vcode"].ToString())
??????????? {
??????????????? string strName = Request.Form["txtName"];
??????????????? string strPwd = Request.Form["txtPwd"];
??????????????? Session["uname"] = strName;
??????????????? Session["udate"] = DateTime.Now.ToString();
??????????????? Response.Redirect("IndexBySession.aspx");
??????????? }
??????????? else
??????????? {
??????????????? Response.Write("驗證碼錯了");
??????????? }
??????? }
??? }
}
四、圖片
五、源碼下載
轉載于:https://www.cnblogs.com/hao1234/archive/2011/08/14/2138561.html
總結
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