漂亮的验证码(.Net MVC)
来源:互联网 发布:数据库中的触发器 编辑:程序博客网 时间:2024/05/22 04:23
1.效果预览:
2.源码实现:
//2.1随机码和图片流生成
public class ValidateCode
{
/// <summary>
/// 產生圖形驗證碼。
/// </summary>
/// <param name="Code">傳出驗證碼。</param>
/// <param name="CodeLength">驗證碼字元數。</param>
/// <param name="Width"></param>
/// <param name="Height"></param>
/// <param name="FontSize"></param>
/// <returns></returns>
public static byte[] CreateValidateGraphic(out String Code, int CodeLength, int Width, int Height, int FontSize)
{
String sCode = String.Empty;
//顏色列表,用於驗證碼、噪線、噪點
Color[] oColors ={
System.Drawing.Color.Black,
System.Drawing.Color.Red,
System.Drawing.Color.Blue,
System.Drawing.Color.Green,
System.Drawing.Color.Orange,
System.Drawing.Color.Brown,
System.Drawing.Color.Brown,
System.Drawing.Color.DarkBlue
};
//字體列表,用於驗證碼
string[] oFontNames = { "Times New Roman", "MS Mincho", "Book Antiqua", "Gungsuh", "PMingLiU", "Impact" };
//驗證碼的字元集,去掉了一些容易混淆的字元
char[] oCharacter = {
'2','3','4','5','6','8','9',
'A','B','C','D','E','F','G','H','J','K', 'L','M','N','P','R','S','T','W','X','Y'
};
Random oRnd = new Random();
Bitmap oBmp = null;
Graphics oGraphics = null;
int N1 = 0;
System.Drawing.Point oPoint1 = default(System.Drawing.Point);
System.Drawing.Point oPoint2 = default(System.Drawing.Point);
string sFontName = null;
Font oFont = null;
Color oColor = default(Color);
//生成驗證碼字串
for (N1 = 0; N1 <= CodeLength - 1; N1++)
{
sCode += oCharacter[oRnd.Next(oCharacter.Length)];
}
oBmp = new Bitmap(Width, Height);
oGraphics = Graphics.FromImage(oBmp);
oGraphics.Clear(System.Drawing.Color.White);
try
{
for (N1 = 0; N1 <= 4; N1++)
{
//畫噪線
oPoint1.X = oRnd.Next(Width);
oPoint1.Y = oRnd.Next(Height);
oPoint2.X = oRnd.Next(Width);
oPoint2.Y = oRnd.Next(Height);
oColor = oColors[oRnd.Next(oColors.Length)];
oGraphics.DrawLine(new Pen(oColor), oPoint1, oPoint2);
}
float spaceWith = 0, dotX = 0, dotY = 0;
if (CodeLength != 0)
{
spaceWith = (Width - FontSize * CodeLength - 10) / CodeLength;
}
for (N1 = 0; N1 <= sCode.Length - 1; N1++)
{
//畫驗證碼字串
sFontName = oFontNames[oRnd.Next(oFontNames.Length)];
oFont = new Font(sFontName, FontSize, FontStyle.Italic);
oColor = oColors[oRnd.Next(oColors.Length)];
dotY = (Height - oFont.Height) / 2 + 2;//中心下移2像素
dotX = Convert.ToSingle(N1) * FontSize + (N1 + 1) * spaceWith;
oGraphics.DrawString(sCode[N1].ToString(), oFont, new SolidBrush(oColor), dotX, dotY);
}
for (int i = 0; i <= 30; i++)
{
//畫噪點
int x = oRnd.Next(oBmp.Width);
int y = oRnd.Next(oBmp.Height);
Color clr = oColors[oRnd.Next(oColors.Length)];
oBmp.SetPixel(x, y, clr);
}
Code = sCode;
//保存图片数据
MemoryStream stream = new MemoryStream();
oBmp.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
finally
{
oGraphics.Dispose();
}
}
}
//2.2图片流以图片的形式响应到页面
public class ValidateCodeController : Controller
{
public ActionResult GetImg()
{
int width = ConverterHelper.ObjToInt(Request.Params["width"], 100);
int height = ConverterHelper.ObjToInt(Request.Params["height"], 40);
int fontsize = ConverterHelper.ObjToInt(Request.Params["fontsize"], 20);
string code = string.Empty;
byte[] bytes = ValidateCode.CreateValidateGraphic(out code, 4, width, height, fontsize);
SessionHelper.SetValiCode(code);
return File(bytes, @"image/jpeg");
}
}
//2.3页面显示及刷新(img+js)
<img id="GL_StandardCode" style="cursor: pointer;" src="@Url.Action("GetImg", "ValidateCode")?t=@DateTime.Now.Ticks" title="看不清,点击换一张" />
$("#GL_StandardCode").click(function () {
var newSrc = "@Url.Action("GetImg", "ValidateCode")" + "?t=" + (new Date()).getTime();
this.src=newSrc;
return false;
});
//2.4登录时判断SESSION值
string pCode = Request.Params["GL_CodeInput"];
string sCode = SessionHelper.GetValiCode();
if (string.IsNullOrEmpty(pCode))
{
resultMsg = "请输入验证码";
}
else if (string.IsNullOrEmpty(sCode))
{
resultMsg = "验证码过期";
}
else if (pCode.ToLower() != sCode.ToLower())
{
resultMsg = "验证码不正确";
}
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