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asp.net生成图形验证码 静态图形验证码

时间：2013-05-07 编辑：简简单单 来源：一聚教程网

费话少说上代码

新建一个一般处理程序..即:.ashx文件  如下:CreateCode.ashx

 代码如下 复制代码
<%@ WebHandler Language="C#" Class="CreateCode" %>
 
using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.SessionState;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
 
public class CreateCode : IHttpHandler,IRequiresSessionState
{
//验证码 by Jack
    public void ProcessRequest(HttpContext context)
    {
        System.Web.HttpResponse response = context.Response;
        //验证码文字内容
        string checkCode = CreateCheckCodeString();
        context.Session.Add("createcodeStr", checkCode);
         
        int width = 80;//验证码图片宽度
        int height = 22;//验证码图片高度
        Font font = new Font("Arial", 12, FontStyle.Bold);//验证码字体
        SolidBrush brush = new SolidBrush(Color.Black);//用于写验证码的画笔
        Pen crosswise = new Pen(Color.Green, 0);//画横向干扰线的钢笔
        Pen vertical = new Pen(Color.FromArgb(255, 100, 100, 100), 0);//画纵向干扰线的钢笔
        Bitmap image = new Bitmap(width, height);//生成图像
        Graphics g = Graphics.FromImage(image);//生成一个绘画面板（画布）
        g.Clear(ColorTranslator.FromHtml("#f0f0f0"));//用指定颜色填充画布
        RectangleF rect = new RectangleF(5, 2, width, height);//定义文字的绘制矩形
        Random rand = new Random((int)DateTime.Now.Ticks);//生成干扰线的随机对象
        for (int i = 0; i < 2; i++)
        {
            Point start = new Point(0, rand.Next(height));
            Point end = new Point(width, rand.Next(height));
            g.DrawLine(crosswise, start, end);
        }
        for (int i = 0; i < 4; i++)
        {
            Point start = new Point(rand.Next(width), 0);
            Point end = new Point(rand.Next(width), height);
            g.DrawLine(vertical, start, end);
        }
        g.DrawString(checkCode, font, brush, rect);//将验证码写到画布上
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        try
        {
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            response.ClearContent();
            response.ContentType = "image/Gif";
            response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            ms.Flush();
            ms.Close();
            ms.Dispose();
            g.Dispose();
            image.Dispose();
        }
    }
    private string CreateCheckCodeString()
    { //定义用于验证码的字符数组
        char[] AllCheckCodeArray ={ '1','2','3','4','5','6','7','8','9','A','B','C',
        'D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W',
        'X','Y','Z'};
        //定义验证码字符串
        string randomcode = "";
        Random rd = new Random();
        //生成4位验证码字符串
        for (int i = 0; i < 5; i++)
            randomcode += AllCheckCodeArray[rd.Next(AllCheckCodeArray.Length)];
        return randomcode;
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
 
}

中的五个作为验证码存储在session里验证createcodeStr

 页面里引用

 代码如下 复制代码

 style="cursor: pointer;" runat="server" title="点击刷新验证码" alt="点击刷新验证码" />


这里点击更换验证码.

后台验证的时候.

 代码如下 复制代码

string dd = HttpContext.Current.Session["Mind_createcodeStr"].ToString();
if (dd.Equals(validatCode.ToUpper())){}

其中 validatCode 就是接收用户输入的验证码了.

或者是用户直接
 

当然 runat="server" 的服务器控件后台获取,或者是html表单提交后台request对象获取.

相信小白都能理解了....是不是太罗嗦?

自己又突然有点想法....


就是这第二种....

 代码如下 复制代码

<%@ WebHandler Language="C#" Class="CreateCode" %>
 
using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.SessionState;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
 
public class CreateCode : IHttpHandler, IRequiresSessionState
{
    ///


    /// 动态验证码 by Jack
    /// 传值type不为null时候 运算验证码
    ///  
    public void ProcessRequest(HttpContext context)
    {
        System.Web.HttpResponse response = context.Response;
        //验证码文字内容
        string type="";
        if (context.Request["type"] != null)
            type = context.Request["type"].ToString();
        string checkCode = "";
        if (string.IsNullOrEmpty(type))
        {
            checkCode = CreateCheckCodeString();
            context.Session.Add("gs_codeStr", checkCode);
        }
        else
        {
            string[] codes = CreateCheckCode();
            checkCode = codes[0];
            context.Session.Add("gs_codeStr", codes[1]);
        }
        int width = 80;//验证码图片宽度
        int height = 22;//验证码图片高度
        Font font = new Font("Arial", 12, FontStyle.Bold);//验证码字体
        SolidBrush brush = new SolidBrush(Color.Black);//用于写验证码的画笔
        Pen crosswise = new Pen(Color.Green, 0);//画横向干扰线的钢笔
        Pen vertical = new Pen(Color.FromArgb(255, 100, 100, 100), 0);//画纵向干扰线的钢笔
        Bitmap image = new Bitmap(width, height);//生成图像
        Graphics g = Graphics.FromImage(image);//生成一个绘画面板（画布）
        g.Clear(ColorTranslator.FromHtml("#f0f0f0"));//用指定颜色填充画布
        RectangleF rect = new RectangleF(10, 2, width, height);//定义文字的绘制矩形 浮动x ,y, 宽度, 高度,
        Random rand = new Random((int)DateTime.Now.Ticks);//生成干扰线的随机对象
        for (int i = 0; i < 2; i++)
        {
            Point start = new Point(0, rand.Next(height));
            Point end = new Point(width, rand.Next(height));
            g.DrawLine(crosswise, start, end);
        }
        for (int i = 0; i < 4; i++)
        {
            Point start = new Point(rand.Next(width), 0);
            Point end = new Point(rand.Next(width), height);
            g.DrawLine(vertical, start, end);
        }
        g.DrawString(checkCode, font, brush, rect);//将验证码写到画布上
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        try
        {
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            response.ClearContent();
            response.ContentType = "image/Gif";
            response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            ms.Flush();
            ms.Close();
            ms.Dispose();
            g.Dispose();
            image.Dispose();
        }
    }
    //定义字符串验证码
    private string CreateCheckCodeString()
    { //定义用于验证码的字符数组
        char[] AllCheckCodeArray ={ '1','2','3','4','5','6','7','8','9','A','B','C',
        'D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W',
        'X','Y','Z'};
        //定义验证码字符串
        string randomcode = "";
        Random rd = new Random();
        //生成4位验证码字符串
        for (int i = 0; i < 5; i++)
            randomcode += AllCheckCodeArray[rd.Next(AllCheckCodeArray.Length)];
        return randomcode;
    }
 
    //定义数字运算验证码 {1+1=? ,2}
    private string[] CreateCheckCode()
    { //定义用于验证码的字符数组
        int[] AllCheckCodeArray = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        //定义验证码字符串
        string randomcode = "";//1+1=?
        int result = 0;//2
        Random rd = new Random();
        //生成4位验证码字符串
        for (int i = 0; i < 5; i++)
            if (i != 1 && i != 4)
            {
                int curint = AllCheckCodeArray[rd.Next(AllCheckCodeArray.Length)];
                if (i == 0 || i == 2)
                    result += curint;
                if (i == 3)
                    randomcode += "=";
                else
                    randomcode += curint;
            }
            else
            {
                if (i == 1)
                    randomcode += "+";
                if (i == 4)
                    randomcode += "?";
            }
        return new string[] { randomcode, result.ToString() };
    }
 
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
 
}

相信看过我发过的第一篇验证码文字.再看这个之二遍有了新的理解

简单的计算验证码....

 引用

 代码如下 复制代码


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