using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;namespace hzShop.customer...{ /**//// <summary> /// 生成验证图片 /// 小憨 /// 2006-8-17 /// 如果要在页面a.aspx生成验证码,则在该页面添加一个图片控件,假设命名为:Image1,然后在page_Load事件中写如下代码: ///Image1.ImageUrl = "image.aspx"; ///这样就可以生成验证码了,image.aspx页面可以随便放在哪里,不过要注意Image1.src 要写对,同级可以直接写image.aspx,上一级写../image.aspx。 /// </summary> public class image : System.Web.UI.Page ...{ private void Page_Load(object sender, System.EventArgs e) ...{ CreateImage.DrawImage(); } Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) ...{ // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /**//// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() ...{ this.Load += new System.EventHandler(this.Page_Load); } #endregion } public class CreateImage ...{ public static void DrawImage() ...{ CreateImage img=new CreateImage(); HttpContext.Current.Session["CheckCode"]=img.RndNum(4); img.CreateImages(HttpContext.Current.Session["CheckCode"].ToString()); } /**//// <summary> /// 生成验证图片 /// </summary> /// <param name="checkCode">验证字符</param> private void CreateImages(string checkCode) ...{ int iwidth = (int)(checkCode.Length * 13); System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 23); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); g.Clear(Color.White); //定义颜色 Color[] c = ...{Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple}; //定义字体 string[] font = ...{"Verdana","Microsoft Sans Serif","Comic Sans MS","Arial","宋体"}; Random rand = new Random(); //随机输出噪点 for(int i=0;i<50;i++) ...{ int x = rand.Next(image.Width); int y = rand.Next(image.Height); g.DrawRectangle(new Pen(Color.LightGray, 0),x,y,1,1); } //输出不同字体和颜色的验证码字符 for(int i=0;i<checkCode.Length;i++) ...{ int cindex = rand.Next(7); int findex = rand.Next(5); Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold); Brush b = new System.Drawing.SolidBrush(c[cindex]); int ii=4; if((i+1)%2==0) ...{ ii=2; } g.DrawString(checkCode.Substring(i,1), f, b, 3+(i*12), ii); } //画一个边框 g.DrawRectangle(new Pen(Color.Black,0),0,0,image.Width-1,image.Height-1); //输出到浏览器 System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg); HttpContext.Current.Response.ClearContent(); // Response.ClearContent(); HttpContext.Current.Response.ContentType = "image/Jpeg"; HttpContext.Current.Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose(); } /**//// <summary> /// 生成随机的字母 /// </summary> /// <param name="VcodeNum">生成字母的个数</param> /// <returns>string</returns> private string RndNum(int VcodeNum) ...{ string Vchar = "0,1,2,3,4,5,6,7,8,9" ; string[] VcArray = Vchar.Split(',') ; string VNum = "" ; //由于字符串很短,就不用StringBuilder了 int temp = -1 ; //记录上次随机数值,尽量避免生产几个一样的随机数 //采用一个简单的算法以保证生成随机数的不同 Random rand =new Random(); for ( int i = 1 ; i < VcodeNum+1 ; i++ ) ...{ if ( temp != -1) ...{ rand =new Random(i*temp*unchecked((int)DateTime.Now.Ticks)); } int t = rand.Next(VcArray.Length ) ; if (temp != -1 && temp == t) ...{ return RndNum( VcodeNum ); } temp = t ; VNum += VcArray[t]; } return VNum ; } }}