<script type="text/javascript">
$(document).ready(function () {
$("#validimg").click(function () {
$("#validimg").attr('src', '@Url.Content("~/Home/GenerateImage?")' + Math.random());
});
})
</script>
<div>
<img alt="验证码" id="validimg" src="@Url.Action("GenerateImage", "Home")" />
</div>
public class HomeController : Controller
{
public byte[] Test()
{
Random r = new Random((int)DateTime.Now.Ticks);
int startChar = 64;
string result = String.Empty;
for (int i = 0; i < 4; i++)
{
int t = r.Next(1, 27);
result += Convert.ToChar(t + startChar);
}
var image = new Bitmap((int)Math.Ceiling(result.Length * 15.0), 22);
var g = Graphics.FromImage(image);
try
{
var random = new Random();
g.Clear(Color.White);
for (int i = 0; i < 25; i++)
{
var x1 = random.Next(image.Width);
var x2 = random.Next(image.Width);
var y1 = random.Next(image.Height);
var y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
var brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(result, font, brush, 3, 2);
//画图片的前景干扰点
for (var i = 0; i < 100; i++)
{
var x = random.Next(image.Width);
var y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
var stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
//
// GET: /Home/
public ActionResult Index()
{
return View();
}
public ActionResult GenerateImage()
{
return File(Test(), @"image/gif");
}
}