ASP.NET中常用功能代码总结(2)——生成验证图片
ASP.NET中常用功能代码总结(2)——生成验证图片
整理:Terrylee
生成随机的验证图片
使用方法:
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///调用函数将验证码生成图片
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this.CreateCheckCodeImage(GenerateCheckCode());
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/None.gif)
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/// <summary>
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/// 产生五位的随机字符串
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/// </summary>
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/// <returns></returns>
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private string GenerateCheckCode()
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{
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int number;
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char code;
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string checkCode = String.Empty;
10![](/Images/OutliningIndicators/InBlock.gif)
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System.Random random = new Random();
12![](/Images/OutliningIndicators/InBlock.gif)
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for (int i = 0; i < 5; i++)
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{
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number = random.Next();
16![](/Images/OutliningIndicators/InBlock.gif)
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if (number % 2 == 0)
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code = (char)('0' + (char)(number % 10));
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else
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code = (char)('A' + (char)(number % 26));
21![](/Images/OutliningIndicators/InBlock.gif)
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checkCode += code.ToString();
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}
24![](/Images/OutliningIndicators/InBlock.gif)
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///用于客户端校验码比较
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Session["CheckCode"] = checkCode;
27![](/Images/OutliningIndicators/InBlock.gif)
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return checkCode;
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}
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/// <summary>
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/// 将验证码生成图片显示
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/// </summary>
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/// <param name="checkCode"></param>
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private void CreateCheckCodeImage(string checkCode)
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{
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if (checkCode == null || checkCode.Trim() == String.Empty)
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return;
39![](/Images/OutliningIndicators/InBlock.gif)
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System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
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Graphics g = Graphics.FromImage(image);
42![](/Images/OutliningIndicators/InBlock.gif)
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try
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{
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///生成随机生成器
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Random random = new Random();
47![](/Images/OutliningIndicators/InBlock.gif)
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///清空图片背景色
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g.Clear(Color.White);
50![](/Images/OutliningIndicators/InBlock.gif)
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///画图片的背景噪音线
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for (int i = 0; i < 25; i++)
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{
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int x1 = random.Next(image.Width);
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int x2 = random.Next(image.Width);
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int y1 = random.Next(image.Height);
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int y2 = random.Next(image.Height);
58![](/Images/OutliningIndicators/InBlock.gif)
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g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
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}
61![](/Images/OutliningIndicators/InBlock.gif)
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Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
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System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
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g.DrawString(checkCode, font, brush, 2, 2);
65![](/Images/OutliningIndicators/InBlock.gif)
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///画图片的前景噪音点
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for (int i = 0; i < 100; i++)
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{
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int x = random.Next(image.Width);
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int y = random.Next(image.Height);
71![](/Images/OutliningIndicators/InBlock.gif)
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image.SetPixel(x, y, Color.FromArgb(random.Next()));
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}
74![](/Images/OutliningIndicators/InBlock.gif)
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///画图片的边框线
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g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
77![](/Images/OutliningIndicators/InBlock.gif)
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System.IO.MemoryStream ms = new System.IO.MemoryStream();
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image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
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Response.ClearContent();
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Response.ContentType = "image/Gif";
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Response.BinaryWrite(ms.ToArray());
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}
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finally
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{
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g.Dispose();
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image.Dispose();
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}
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}
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