验证码控件

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.Net/C#

ASP ASP.net UI Web Security

先创建一个aspx的页面在后台的cs代码中写如下代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;

public partial class ValidateData : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.ContentType = "image/jpeg";
        Session["code"] = GetElements();
        System.Drawing.Image img = DrawImage(Session["code"].ToString());
        img.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    public String GetElements()
    {
        string str = "0,1,2,3,4,5,6,7,8,9,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";
        string[] elemets = str.Split(',');
        string code = String.Empty;
        Random rnd = new Random();
        for (int i = 0; i < 4; i++)
        {
            code += elemets[rnd.Next(elemets.Length)];
        }
        return code;
    }

    System.Drawing.Image DrawImage(string element)
    {
        Bitmap bt = new Bitmap(100, 30);
        Font ft = new Font("隶书", 20f, FontStyle.Bold);
        Graphics g = Graphics.FromImage(bt);
        int width = (int)g.MeasureString(element, ft).Width;

        bt = new Bitmap(bt, width, bt.Height);
        g = Graphics.FromImage(bt);
        g.FillRectangle(Brushes.Gray, new Rectangle(0, 0, 100, 30));
        g.DrawString(element, ft, Brushes.Black, 0f, 0f);
        g.Dispose();

        Random rnd = new Random();
        for (int i = 0; i < 200; i++)
        {
            bt.SetPixel(rnd.Next(width), rnd.Next(30), Color.FromArgb(rnd.Next(256), rnd.Next(256), rnd.Next(256)));
        }
        return bt;
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

这样OK控件写好了，用的时候需要在新页面中写一个aspx：image 或者 img 标签来获取

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

后台

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btn_Click(object sender, EventArgs e)
    {
        if (txtResult.Text != null && txtResult.Text.ToLower() == Session["code"].ToString().ToLower())
        {
            lblResult.Text = "正确";
        }
        else
            lblResult.Text = "错误";
    }
}

好了，这样一个纯代码写的验证码空间就写好了

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/QQlvbo/archive/2008/12/15/3519923.aspx

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2010-06-16 20:37
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