验证码-向日葵屋

验证码

<%—为a标签注册验证码事件—%>

一般处理程序制作验证码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
using System.Web.SessionState;//添加命名空间，用于保存session

namespace LiBangWuLiu
{
///

/// VerifyCode 的摘要说明
///

public class VerifyCode : IHttpHandler,IRequiresSessionState //实现IRequiresSessionState
{
///

/// 创建一副图片，画上验证码
///

///

    public void ProcessRequest(HttpContext context)  
    \{  
        context.Response.ContentType = "image/plain";//响应类型为图片image  
        string validateCode = getValidateCode(4);//获取一个四位数字的验证码  
        context.Session\["validateCode"\] = validateCode;//将验证码存到session中，  
        //创建验证码图片  
        using (Bitmap img = new Bitmap(60, 28))//创建具体位置图像,位图  
        \{  
            using (Graphics g = Graphics.FromImage(img))//从指定的img创建新的图面)  
            \{  
                g.Clear(Color.LightYellow);//初始化图片背景色  
                g.DrawRectangle(new Pen(Color.Red), 0, 0, img.Width - 1, img.Height - 1);//画图片上矩形的边框，从坐标（0，0）开始，相对于图片的坐标  
                Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold));//字体样式  
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.DarkRed, 1.2F, true);//渐变效果                                                                                                                                                                                                             
                g.DrawString(validateCode, font, brush, 2, 2);//将验证码写入图片  
                //画前景线 ，随机生成几个点，（x1,y1）到（x2,y2）画线   
                Random ran = new Random();                    
                int i;  
                for (i = 0; i < 10; i++)  
                \{  
                    int x1 = ran.Next(img.Width);  
                    int x2 = ran.Next(img.Width);  
                    int y1 = ran.Next(img.Height);  
                    int y2 = ran.Next(img.Height);  
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);  
                \}  
            \}  
            img.Save(context.Response.OutputStream, ImageFormat.Jpeg);//将图片保存到响应流  
            //string yanzhengma1 = context.Request.QueryString\["yzm"\];  
            //context.Response.Write(yanzhengma(validateCode,yanzhengma1));//返回产生的随机数  
            //context.Response.End();  
        \}  
    \}  
    bool falg = false;  
    public bool yanzhengma(string sjm,string yzm)  
    \{  
        if (sjm == yzm)  
        \{  
            falg = true;  
        \}  
        else \{  
            falg = false;  
        \}  
        return falg;  
    \}  
    /// <summary>  
    /// 生成随机码的方法,  
    /// </summary>  
    /// <param name="validateCodeLength">随机码的长度</param>  
    /// <returns>随机码</returns>  
    private string getValidateCode(int validateCodeLength)  
    \{  
        string allchar =@"123456789qwertyuioplkjhgfdsazxcvbnm123456789QWERTYUIOPLKJHGFDSAZXCVBNM";//列出所有可能出现的字符  
        int length = allchar.Length;//获取所有字符的个数  
        Random ran = new Random();//声明生成一个随机数的对象  
        string validateCode = string.Empty;//声明随机码  
        for (int i = 0; i < validateCodeLength; i++)  
        \{  
            validateCode += allchar\[ran.Next(length)\];//找到随机码，用生成的随机数作为字符串的索引，下标         
        \}  
            return validateCode;  
    \}  
    public bool IsReusable  
    \{  
        get  
        \{  
            return false;  
        \}  
    \}  
\}