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发布一个很COOL的图片验证码程序[含源码]

發布時間：2025/3/15 编程问答 80 豆豆

生活随笔收集整理的這篇文章主要介紹了发布一个很COOL的图片验证码程序[含源码] 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

一、先看看效果:

制作步驟：
（1）準備你想要的多張圖片（數量不限，由你自己決定），將它們放在一個統一的目錄下，比如我這里是“ValidateCodeImg”。圖片尺寸盡量適合你的驗證碼尺寸。這樣有利于達到最佳性能比。

（2）將以下代碼分別COPY到你的工程目錄下（記得放在ValidateCodeImg目錄的上一級目錄中）。

二、相關代碼：
1、// ValidateCode.aspx頁面:
-----------------------------------------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidateCode.aspx.cs" Inherits="Comm_ValidateCode" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
??? <title>生成圖片驗證碼</title>
</head>
<body>
??? <form id="form1" runat="server">
??? <div>
???
??? </div>
??? </form>
</body>
</html>

2、// ValidateCode.aspx.cs
--------------------------------------
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;
using System.Drawing.Imaging;
using System.IO;

public partial class Comm_ValidateCode : System.Web.UI.Page
{
??? int _width = 75;
??? int _height = 21;
//??? int _width = 128;
//??? int _height = 40;
??? string imgDir = @"ValidateCodeImg";
??? public int Width
??? {
??????? get
??????? {
??????????? return _width;
??????? }
??????? set
??????? {
??????????? _width = value;
??????? }
??? }

??? public int Height
??? {
??????? get
??????? {
??????????? return _height;
??????? }
??????? set
??????? {
??????????? _height = value;
??????? }
??? }

??? protected void Page_Load(object sender, EventArgs e)
??? {
??????? if (Request.QueryString["w"] != null)
??????? {
??????????? try
??????????? {
??????????????? this._width = int.Parse(Request.QueryString["w"].Trim());
??????????? }
??????????? catch (Exception exc)
??????????? {
??????????????? //
??????????? }
??????? }
??????? if (Request.QueryString["h"] != null)
??????? {
??????????? try
??????????? {
??????????????? this._height = int.Parse(Request.QueryString["h"].Trim());
??????????? }
??????????? catch (Exception exc)
??????????? {
??????????????? //
??????????? }
??????? }
??????? //? 4位數字的驗證碼
??????? if (!IsPostBack)
??????? {
??????????? string str_ValidateCode = GetRandomNumberString(4);
??????????? //用于驗證的Session
??????????? Session["ValidateCode"] = str_ValidateCode;
??????????? CreateImage(str_ValidateCode);
??????? }
??? }

??? //? 生成隨機數字字符串
??? public string GetRandomNumberString(int int_NumberLength)
??? {
??????? string str_Number = string.Empty;
??????? Random theRandomNumber = new Random();

??????? for (int int_index = 0; int_index < int_NumberLength; int_index++)
??????????? str_Number += theRandomNumber.Next(10).ToString();

??????? return str_Number;
??? }

??? //生成隨機顏色
??? public Color GetRandomColor()
??? {
??????? Random RandomNum_First = new Random((int)DateTime.Now.Ticks);
??????? System.Threading.Thread.Sleep(RandomNum_First.Next(50));
??????? Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);
??????? int int_Red = RandomNum_First.Next(256);
??????? int int_Green = RandomNum_Sencond.Next(256);
??????? int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;
??????? int_Blue = (int_Blue > 255) ? 255 : int_Blue;

??????? return Color.FromArgb(int_Red, int_Green, int_Blue);
??? }

??? public FileInfo[] GetAllFilesInPath(string path)
??? {
??????? System.IO.DirectoryInfo di = new DirectoryInfo(path);

??????? return di.GetFiles("*.jpg", SearchOption.TopDirectoryOnly);
??? }

??? public string GetRandomFile(string path)
??? {
??????? FileInfo[] fi = this.GetAllFilesInPath(path);
??????? Random rand = new Random(new Guid().GetHashCode() + (int)DateTime.Now.Ticks);
??????? int k = rand.Next(0, fi.Length);

??????? return fi[k].FullName;
??? }

??? public int GetRandomAngle()
??? {
??????? Random rand = new Random((int)DateTime.Now.Ticks);
??????? System.Threading.Thread.Sleep(rand.Next(50));
??????? return rand.Next(-45, 45);
??? }

??? //根據驗證字符串生成最終圖象
??? public void CreateImage(string str_ValidateCode)
??? {
??????? //int int_ImageWidth = str_ValidateCode.Length * 13;
??????? //int width = int_ImageWidth;
??????? int int_ImageWidth = this.Width;
??????? int width = int_ImageWidth;

??????? int height = this.Height;

??????? string filePath = Server.MapPath(imgDir);
??????? Bitmap bgImg = (Bitmap)Bitmap.FromFile(GetRandomFile(filePath));

??????? Random newRandom = new Random();
??????? //? 圖高20px
??????? Bitmap theBitmap = new Bitmap(width, height);
??????? Graphics theGraphics = Graphics.FromImage(theBitmap);
??????? theGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
??????? theGraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
??????? theGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
??????? theGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
??????? //? 白色背景
??????? //theGraphics.Clear(Color.White);
??????? theGraphics.DrawImage(bgImg, new Rectangle(0, 0, width, height), new Rectangle(0, 0, bgImg.Width, bgImg.Height), GraphicsUnit.Pixel);
??????? //? 灰色邊框
??????? theGraphics.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, height - 1);

??????? //13pt的字體
??????? float fontSize = this.Height * 1.0f / 1.38f;
??????? float fontSpace = fontSize / 7f;
??????? Font theFont = new Font("Arial", fontSize);
??????? System.Drawing.Drawing2D.GraphicsPath gp = null;
??????? System.Drawing.Drawing2D.Matrix matrix;
??????? for (int int_index = 0; int_index < str_ValidateCode.Length; int_index++)
??????? {
??????????? string str_char = str_ValidateCode.Substring(int_index, 1);
??????????? Brush newBrush = new SolidBrush(GetRandomColor());
??????????? Point thePos = new Point((int)(int_index * (fontSize + fontSpace) + newRandom.Next(3)), 1 + newRandom.Next(3));
??????????? gp = new System.Drawing.Drawing2D.GraphicsPath();
??????????? gp.AddString(str_char, theFont.FontFamily, 0, fontSize, thePos, new StringFormat());
??????????? matrix = new System.Drawing.Drawing2D.Matrix();
??????????? int angle = GetRandomAngle();
??????????? PointF centerPoint = new PointF(thePos.X + fontSize / 2, thePos.Y + fontSize / 2);
??????????? matrix.RotateAt(angle, centerPoint);
??????????? theGraphics.Transform = matrix;
??????????? theGraphics.DrawPath(new Pen(Color.White, 2f), gp);
??????????? //theGraphics.FillPath(new SolidBrush(Color.Black), gp);
??????????? theGraphics.FillPath(new SolidBrush(GetRandomColor()), gp);
??????????? theGraphics.ResetTransform();
??????? }

??????? if (gp != null) gp.Dispose();

??????? //? 將生成的圖片發回客戶端
??????? MemoryStream ms = new MemoryStream();
??????? theBitmap.Save(ms, ImageFormat.Png);

??????? Response.ClearContent(); //需要輸出圖象信息要修改HTTP頭
??????? Response.ContentType = "image/Png";
??????? Response.BinaryWrite(ms.ToArray());
??????? theGraphics.Dispose();
??????? theBitmap.Dispose();
??????? Response.End();
??? }
}
?
三、如何使用?
1、引用驗證碼圖形時：
<img src="ValidateCode.aspx?w=100&h=32" id="ValidateCodeAuto" width="100" height="32" align="absmiddle" />   <a href="#" οnclick="Javascript:var now=new Date();var number = now.getSeconds(); document.getElementById('ValidateCodeAuto').src='ValidateCode.aspx?w=100&h=32&dd=' + number;">看不清楚</a>
2、驗證時，判斷用戶輸入驗證碼是否等于 Session["ValidateCode"] 即可。
3、其他說明：（1）上面有兩個參數w和h，是用來定義圖形驗證碼大小的。比如你想將你驗證碼設置為128*40時，你只需要ValidateCode.aspx?w=128&h=40，然后將圖片引用后面的Width,Height改成：width="128" height="40" 即可。對應的，看不清楚的Javascript代碼也需要將src='ValidateCode.aspx?w=100&h=32改成：src='ValidateCode.aspx?w=128&h=40。
（2）“看不清楚”處還有一個參數dd，是用來做生成隨機值以便更新驗證碼圖片的。

轉載于:https://www.cnblogs.com/yamajia/archive/2007/11/13/958205.html

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