asp.net 生成验证码
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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 validate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if(!this.IsPostBack)
{
this.GenImg(this.GetCode(4));
}
}
//?úÉúËæ?ú×Ö?û??
private string GetCode(int num)
{
string[]
source={"1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I",
"J","K","L","M","N","P","Q","R","S","T","U","V","W","X","Y","Z"};
string code="";
Random rd=new Random();
for(int i=0;i < num;i++)
{
code += source[rd.Next(0,source.Length)]; }
return code;
}
//Éú?ÉÍ?Æ?
private void GenImg(string code)
{
Random rd = new Random();
Bitmap myPalette = new Bitmap(120, 60); //??ÒåÒ??ö?,?å
Graphics gh = Graphics.FromImage(myPalette); //ÔÚ?,?åÉÏ??Òå?æÍ?µÄʵÀý Rectangle rc = new Rectangle(0, 0, 120, 60); //??ÒåÒ??ö?ØÐÎ String picPath = Server.MapPath("pic/bg" + rd.Next(1,4).ToString().Trim() + ".jpg" );
Bitmap imagefile = (Bitmap)System.Drawing.Image.FromFile(picPath, true); //µÃµ?Ò?ÕÅÎ?Í?
TextureBrush texture = new TextureBrush(imagefile); //ÒÔÍ?Æ???Á??æÍ?Ë? Color[] fontcolor = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Red, Color.Brown, Color.DarkCyan, Color.Purple }; //??Òå 8 ÖÖÑÕÉ? String[] fontname = { "Verdana", "System", "Comic Sans MS", "Arial", "ËÎÌå" }; //??Òå 5 ÖÖ×ÖÌå
Font myfont; //×ÖÌå??Òå
SolidBrush mybrush; //?,?Ê??Òå
gh.FillRectangle(texture, rc);//Ê?ÓÃ?æÍ?Ë?Ìî?ä?ØÐÎ??µ??˵õ?Í?Æ?????
for (short i = 0; i <= code.Length - 1; i++)
{
myfont = new Font(fontname[rd.Next(0, 5)],30,FontStyle.Italic); //Ëæ?ú×ÖÌå,42ºÅ??Ð?Ìå
mybrush = new SolidBrush(fontcolor[rd.Next(0, 8)]); //Ëæ?úÑÕÉ? gh.DrawString(code.Substring(i,1) , myfont, mybrush, 3 + (i * 23),rd.Next(1,8));//ÔÚ?ØÐÎÄÚ?,?ö×Ö?û??
}
myPalette.Save(Response.OutputStream,
System.Drawing.Imaging.ImageFormat.Jpeg);//??Í?Æ?ÏÔÊ??öÀ?
Session["ValidateCode"] = code;//??×Ö?û?????æµ?SessionÖÐ??ÒÔ?ãÐèÒªÊ??øÐÐÑéÖ?
gh.Dispose();
myPalette.Dispose();
}
}
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