ashx-auth-黑色简洁验证码

ylbtech-util: ashx-auth-黑色简洁验证码

 ashx-auth-黑色简洁验证码

1.A,效果图返回顶部

 

1.B,源代码返回顶部

/ImageUniqueCode.ashx

<%@ WebHandler Language="C#" Class="ImageUniqueCode" %>



using System;

using System.Web;

using System.Drawing;

using System.Text;



public class ImageUniqueCode : IHttpHandler, System.Web.SessionState.IRequiresSessionState

{

    

    public void ProcessRequest (HttpContext context) {

        context.Response.ContentType = "image/gif";

        //建立Bitmap对象，绘图

        Bitmap basemap = new Bitmap(160, 60);

        Graphics graph = Graphics.FromImage(basemap);

        graph.FillRectangle(new SolidBrush(Color.White), 0, 0, 160, 60);

        Font font = new Font(FontFamily.GenericSerif, 48, FontStyle.Bold, GraphicsUnit.Pixel);

        Random r = new Random();

        string letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ0123456789";

        string letter;

        StringBuilder s = new StringBuilder();



        //添加随机字符

        for (int x = 0; x < 4; x++)

        {

            letter = letters.Substring(r.Next(0, letters.Length - 1), 1);

            s.Append(letter);

            graph.DrawString(letter, font, new SolidBrush(Color.Black), x * 38, r.Next(0, 15));

        }



        //混淆背景

        Pen linePen = new Pen(new SolidBrush(Color.Black), 2);

        for (int x = 0; x < 6; x++)

            graph.DrawLine(linePen, new Point(r.Next(0, 159), r.Next(0, 59)), new Point(r.Next(0, 159), r.Next(0, 59)));  



        //将图片保存到输出流中      

        basemap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);

        context.Session["ImageUniqueCode"] = s.ToString();

        context.Response.End();

    }

 

    public bool IsReusable {

        get {

            return true;

        }

    }



}

Attach

/FastFeedBack.ashx  【处理页面】

<%@ WebHandler Language="C#" Class="FastFeedback" %>



using System;

using System.Web;



public class FastFeedback : IHttpHandler, System.Web.SessionState.IRequiresSessionState

{

    //最终状态

    public enum FeedbackState

    {

        UniqueCodeError = 1,

        Succeed = 5,

        Error = 10,

        Null = 20

    }

    

    public void ProcessRequest (HttpContext context) {

        context.Response.ContentType = "text/plain";

        context.Response.CacheControl = "no-cache"; //清空缓存

        

        string code = context.Request["SecurityCode"];

        string message = context.Request["Message"];



        if (string.IsNullOrEmpty(code) || string.IsNullOrEmpty(message))

        {

            context.Response.Write(FeedbackState.Null.ToString());

            context.Response.End();

            return; 

        }



        try

        {

            if (code.ToUpper() == context.Session["ImageUniqueCode"].ToString())

            {

                //执行成功,完成其他任务

                //....do.....

                context.Response.Write(FeedbackState.Succeed.ToString());



            }

            else

            {

                context.Response.Write(FeedbackState.UniqueCodeError.ToString());



            }

        }

        catch (Exception ex)

        {

            context.Response.Write(FeedbackState.Error.ToString());

        }

        finally

        {

            context.Response.End(); 

        }

    }

 

    public bool IsReusable {

        get {

            return false;

        }

    }



}

View Code

1.C,下载地址返回顶部

 

作者：ylbtech 出处：http://ylbtech.cnblogs.com/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。