验证码

来源：互联网发布：java面试项目介绍编辑：程序博客网时间：2024/05/29 02:26

调用：<img id="Image1" src="Server/CheckNUM.aspx" style="height:29px;width:167px;border-width:0px;" />
以下是CheckNUM.aspx的内容：  public void ToImage(string text)
   {
   int nWidth = 150, nHeight = 50;
   Bitmap obp = new Bitmap(nWidth, nHeight);
   Graphics g = Graphics.FromImage(obp);
   g.SmoothingMode = SmoothingMode.AntiAlias;
   Font myfont = new Font("宋体", 18, System.Drawing.FontStyle.Bold);
   g.DrawString(text, myfont, Brushes.GreenYellow, 10, 10);
   Pen p = new Pen(Color.Blue);
   p.Width = 1;

   Random oR = new Random();
   Point op1 = new Point();
   Point op2 = new Point();

   op1.X = oR.Next(20);
   op1.Y = oR.Next(50);
   op2.X = oR.Next(100,150);
   op2.Y = oR.Next(50);
   g.DrawLine(p, op1, op2);

   op1.X = oR.Next(20);
   op1.Y = oR.Next(50);
   op2.X = oR.Next(100,150);
   op2.Y = oR.Next(50);
   g.DrawLine(p, op1, op2);

   op1.X = oR.Next(150);
   op1.Y = oR.Next(50);
   op2.X = oR.Next(150);
   op2.Y = oR.Next(50);
   g.DrawLine(p, op1, op2);

   MemoryStream ms = new MemoryStream();
   obp.Save(ms, ImageFormat.Gif);

   Response.BinaryWrite(ms.ToArray());
   Response.End();

   obp.Dispose();

   }