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.Imaging;
using System.Drawing.Drawing2D;
using System.Drawing;
public partial class guestBook_ValitionNo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Random rd = new Random(); //创建随机数对象
//以下4行,产生由6个字母和数字组成的一个字符串
string str = "ABCDEFGHIJKLMNOPQRSTURWXYZ0123456789想象是无限的";
string yanzheng = "";
for (int i = 0; i < 6; i++)
{
yanzheng = yanzheng + str.Substring(rd.Next(42), 1);
}
//验证码值存放到Session中用来比较
Session["yanzheng"] = yanzheng;
//以下三句,通过随机找一个现有图象产生一个画布Bitmap
string bgFilePath = Server.MapPath(".\images\bg_" + new Random().Next(5) + ".jpg");//随机找个图象
System.Drawing.Image imgObj = System.Drawing.Image.FromFile(bgFilePath);
Bitmap newBitmap = new Bitmap(imgObj, 290, 80);//建立位图对象
Graphics g = Graphics.FromImage(newBitmap);//根据上面创建的位图对象创建绘图面
SolidBrush brush = new SolidBrush(Color.Blue);//设置画笔颜色
//定义一个含10种字体的数组
String[] ziti ={ "Arial", "Verdana", "Comic Sans MS", "Impact", "Haettenschweiler", "Lucida Sans Unicode", "Garamond", "Courier New", "Book Antiqua", "Arial Narrow" };
//通过循环,绘制每个字符,
for (int a = 0; a < yanzheng.Length; a++)
{
Font textFont = new Font(ziti[rd.Next(9)], 30, FontStyle.Bold);//字体随机,字号大小30,加粗
//每次循环绘制一个字符,设置字体格式,画笔颜色,字符相对画布的X坐标,字符相对画布的Y坐标
g.DrawString(yanzheng.Substring(a, 1), textFont, brush, 40 + a * 36, 20);
}
//保存画的图片到输出流中
newBitmap.Save(Response.OutputStream, ImageFormat.Gif);
}
}
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;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
if (Session["yanzheng"] != null && TextBox1.Text != Session["yanzheng"].ToString())
{
Label1.Text = "验证码错误！";
return;
}
else
{
Label1.Text = "验证码正确！";
}
}
}