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(, );
        Graphics graph = Graphics.FromImage(basemap);
        graph.FillRectangle(new SolidBrush(Color.White), , , , );
        Font font = new Font(FontFamily.GenericSerif, , 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 = ; x < ; x++)
        {
            letter = letters.Substring(r.Next(, letters.Length - ), );
            s.Append(letter);
            graph.DrawString(letter, font, new SolidBrush(Color.Black), x * , r.Next(, ));
        }

        //混淆背景
        Pen linePen = new Pen(new SolidBrush(Color.Black), );
        for (int x = ; x < ; x++)
            graph.DrawLine(linePen, new Point(r.Next(, ), r.Next(, )), new Point(r.Next(, ), r.Next(, )));  

        //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 = ,
        Succeed = ,
        Error = ,
        Null =
    }

    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;
        }
    }

}

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。