验证吗
/*********************************
*
* 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>