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/********************************* * * FileName:validate.cs * Copyright:(c) 2007-2-1 * Writer:星星 * Create Date:2007-2-1 * Rewriter: * Rewrite Date: * Impact: * Main Content:验证码 可以启中文验证码(可以自行修改，但请存留以上信息) * *********************************/
using System;using System.Text;using System.IO;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;
/// <summary>/// 验证码/// </summary>namespace ImageValidate{ /// <summary> /// 验证码 /// </summary> /// <param name="m_nDisturbLine">干扰线</param> /// <param name="m_nDisturbPoint">干扰点</param> /// <param name="m_strFontSize">字体大小</param> /// <param name="m_strValidate">验证码字符串</param> public class Validate { #region 变量声明 int m_nDisturbLine , m_nDisturbPoint ; int m_strFontSize = 13; string m_strFont = "宋体"; string m_strValidate=null; #endregion
#region 构造函数 /// <summary> /// /// </summary> /// <param name="nDisturbLine">干扰线</param> /// <param name="nDisturbPoint">干扰点</param> public Validate(int nDisturbLine, int nDisturbPoint) { this.m_nDisturbLine = nDisturbLine; this.m_nDisturbPoint = nDisturbPoint; } #endregion
#region 属性 /// <summary> /// 获取验证码字符串 用以保存在Session /// </summary> public string strValidate { get { return this.m_strValidate; } }
/// <summary> /// 设置或获取验证码字体 /// </summary> public string strFont { get { return this.m_strFont; } set { this.m_strFont = value; } }
/// <summary> /// 设置或获取验证码字体大小 /// </summary> public int nFontSize { get { return this.m_strFontSize; } set { this.m_strFontSize = value; } } #endregion
/// <summary> /// 获取字母数字验证码字符串 /// </summary> /// <param name="nLength">验证码字符个数</param> /// <returns>验证码字符串</returns> private string GetStrAscii(int nLength) { int nStrLength = nLength; string strString = "1234567890qwertyuioplkjhgfdsazxcvbnmASDFGHJKLMNBVCXZQWERTYUIOP"; StringBuilder strtemp = new StringBuilder(); Random random = new Random((int)DateTime.Now.Ticks); for (int i = 0; i < nStrLength; i++) { random = new Random(unchecked(random.Next() * 1000)); strtemp.Append(strString[random.Next(61)]); } return strtemp.ToString(); }
/// <summary> /// 获取中文验证码字符串 /// </summary> /// <param name="nLength">验证码字符中文的个数</param> /// <returns>验证码字符串(中文)</returns> private string GetStrChinese(int nLength) { int nStrLength = nLength; object[] btStrings = new object[nStrLength]; string[] strString = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
Random random = new Random(); for (int i = 0; i < nStrLength; i++) { //区位码第1位 int nNext1 = random.Next(11, 14); string strChar1 = strString[nNext1];
//区位码第2位 random = new Random(nNext1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的
int nNext2; if (nNext1 == 13) { nNext2 = random.Next(0, 7); } else { nNext2 = random.Next(0, 16); } string strChar2 = strString[nNext2];
//区位码第3位 random = new Random(nNext2 * unchecked((int)DateTime.Now.Ticks) + i); int nNext3 = random.Next(10, 16); string strChar3 = strString[nNext3];
//区位码第4位 random = new Random(nNext3 * unchecked((int)DateTime.Now.Ticks) + i); int nNext4; if (nNext3 == 10) { nNext4 = random.Next(1, 16); } else if (nNext3 == 15) { nNext4 = random.Next(0, 15); } else { nNext4 = random.Next(0, 16); } string strChar4 = strString[nNext4];
byte bt1 = Convert.ToByte(strChar1 + strChar2, 16); byte bt2 = Convert.ToByte(strChar3 + strChar4, 16); byte[] btString = new byte[2] { bt1, bt2 };
btStrings.SetValue(btString, i); }
//转化成汉字 StringBuilder strReturn = new StringBuilder(); Encoding edGb2312 = Encoding.GetEncoding("gb2312"); for (int i = 0; i < nStrLength; i++) { strReturn.Append(edGb2312.GetString((byte[])Convert.ChangeType(btStrings[i], typeof(byte[])))); } return strReturn.ToString(); }
/// <summary> /// 获取验证码图片 /// </summary> /// <param name="nValidateLength">验证码字符个数</param> /// <param name="nImgWidth">图片宽度</param> /// <param name="nImgHeight">图片高度</param> /// <returns>流的图片</returns> public MemoryStream GetCode(int nType,int nValidateLength ,int nImgWidth, int nImgHeight) { MemoryStream stream = null;
if (nType == 0) //是否启用汉字验证码 { m_strValidate = this.GetStrChinese(nValidateLength); } else { m_strValidate = this.GetStrAscii(nValidateLength); } Bitmap image = new Bitmap(nImgWidth, nImgHeight); Graphics grImg = Graphics.FromImage(image); try { Random random = new Random(); grImg.Clear(Color.White);//清空图片背景色
//画图片的干扰线 for (int i = 0; i < m_nDisturbLine; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); grImg.DrawLine(new Pen(Color.SkyBlue), x1, y1, x2, y2); }
Font font = new Font(m_strFont, m_strFontSize, FontStyle.Bold); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Black, 10.2f, false); grImg.DrawString(m_strValidate, font, brush, 3, 2); //画图片的前景干扰点 for (int i = 0; i < m_nDisturbPoint; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } grImg.DrawRectangle(new Pen(Color.Olive), 0, 0, image.Width - 1, image.Height - 1);//画图片的边框线 //保存图片数据 stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); } finally { grImg.Dispose(); image.Dispose(); } return stream; } }}
//====================<%@ Page Language="C#" %><%@ Import Namespace="System.Drawing"%><%@ Import Namespace="System.Drawing.Drawing2D"%><%@ Import Namespace="System.IO"%><%@ Import Namespace="System.Drawing.Imaging"%><%@ Import Namespace="System.Text"%><%@ Import Namespace="ImageValidate"%><script runat="server"> void page_load(object sender , EventArgs e) { Validate validate = new Validate(12, 50); validate.strFont = "宋体"; validate.nFontSize = 13; MemoryStream stream = validate.GetCode(0, 4, 82, 22); Response.Clear(); Response.ContentType = "image/jpeg"; Response.BinaryWrite(stream.ToArray());
stream.Close(); }</script>
