以下是一个验证码类源代码,使用方法:建立一个ValidateImg.aspx,后台代码里写:ValidateImage img = new ValidateImage();验证的地方:ValidateImage.Validate(txtCode.Text.Trim())
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/// <summary>
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/// 验证码类
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/// </summary>
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public class ValidateImage
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{
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/// <summary>
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/// 要显示的文字
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/// </summary>
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public string Text
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{
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get { return this.text; }
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}
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/// <summary>
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/// 图片
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/// </summary>
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public Bitmap Image
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{
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get { return this.image; }
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}
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/// <summary>
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/// 宽度
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/// </summary>
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public int Width
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{
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get { return this.width; }
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}
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/// <summary>
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/// 高度
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/// </summary>
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public int Height
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{
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get { return this.height; }
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}
34![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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private string text;
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private int width;
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private int height;
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private Bitmap image;
39![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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private static byte[] randb = new byte[4];
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private static Random rand = new Random();
42![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public ValidateImage()
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{
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text = rand.Next(1000, 9999).ToString();
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System.Web.HttpContext.Current.Session["CheckCode"] = text;
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this.width = (int)Math.Ceiling(text.Length * 16.5);
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this.height = 30;
49![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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GenerateImage();
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System.Web.HttpContext.Current.Response.ContentType = "image/pjpeg";
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Image.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg);
53![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
55![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public static bool Validate(string input)
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{
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return System.Web.HttpContext.Current.Session["CheckCode"] != null && System.Web.HttpContext.Current.Session["CheckCode"].ToString().Equals(input);
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}
60![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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~ValidateImage()
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{
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Dispose(false);
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}
65![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public void Dispose()
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{
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GC.SuppressFinalize(this);
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this.Dispose(true);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (disposing)
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this.image.Dispose();
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}
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private FontFamily[] fonts = {
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new FontFamily("Times New Roman"),
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new FontFamily("Georgia"),
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new FontFamily("Arial"),
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new FontFamily("Comic Sans MS")
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};
83![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public int Next(int max)
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{
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return rand.Next(max);
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}
88![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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/// <summary>
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/// 生成验证码图片
91![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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/// </summary>
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private void GenerateImage()
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{
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Bitmap bitmap = new Bitmap(this.width, this.height, PixelFormat.Format32bppArgb);
96![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Graphics g = Graphics.FromImage(bitmap);
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Rectangle rect = new Rectangle(0, 0, this.width, this.height);
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g.SmoothingMode = SmoothingMode.AntiAlias;
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g.Clear(Color.White);
102![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//int emSize = Next(3) + 15;//(int)((this.width - 20) * 2 / text.Length);
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//int emSize = (int)((this.width - 20) * 2 / text.Length);
105![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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int emSize = 12;
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FontFamily family = fonts[Next(fonts.Length - 1)];
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Font font = new Font(family, emSize, FontStyle.Bold);
109![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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SizeF measured = new SizeF(0, 0);
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SizeF workingSize = new SizeF(this.width, this.height);
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while (emSize > 2 && (measured = g.MeasureString(text, font)).Width > workingSize.Width || measured.Height > workingSize.Height)
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{
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font.Dispose();
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font = new Font(family, emSize -= 2);
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}
117![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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SolidBrush drawBrush = new SolidBrush(Color.FromArgb(Next(100), Next(80), Next(80)));
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for (int x = 0; x < 1; x++)
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{
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Pen linePen = new Pen(Color.FromArgb(Next(150), Next(100), Next(100)), 1);
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g.DrawLine(linePen, new PointF(0.0F + Next(2), 0.0F + Next(this.height)), new PointF(0.0F + Next(this.width), 0.0F + Next(this.height - 10)));
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}
124![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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for (int x = 0; x < this.text.Length; x++)
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{
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drawBrush.Color = Color.FromArgb(Next(150) + 20, Next(150) + 20, Next(150) + 20);
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PointF drawPoint = new PointF(0.0F + Next(5) + x * 15, 2.0F + Next(4));
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g.DrawString(this.text[x].ToString(), font, drawBrush, drawPoint);
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}
131![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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double distort = rand.Next(5, 10) * (Next(10) == 1 ? 1 : -1);
133![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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using (Bitmap copy = (Bitmap)bitmap.Clone())
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{
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for (int y = 0; y < height; y++)
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{
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for (int x = 0; x < width; x++)
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{
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int newX = (int)(x + (distort * Math.Sin(Math.PI * y / 84.0)));
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int newY = (int)(y + (distort * Math.Cos(Math.PI * x / 54.0)));
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if (newX < 0 || newX >= width) newX = 0;
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if (newY < 0 || newY >= height) newY = 0;
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bitmap.SetPixel(x, y, copy.GetPixel(newX, newY));
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}
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}
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}
148![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1);
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font.Dispose();
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drawBrush.Dispose();
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g.Dispose();
155![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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this.image = bitmap;
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}
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}
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