ASP.NET MVC实现网站验证码功能(下)
为适合ASP.NET MVC框架，修改其输出图片流的方法CreateValidateGraphic为：
Code
/// <summary>
/// 创建验证码的图片
/// </summary>
/// <param name="containsPage">要输出到的page对象</param>
/// <param name="validateNum">验证码</param>
public byte[] CreateValidateGraphic(string validateCode)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for (int i = 0; i < 25; 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);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(validateCode, font, brush, 3, 2);
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int 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
MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
在Controller.cs中，添加Action，用来设置将生成的验证码存入Session，并输出验证码图片：
Code
public ActionResult GetValidateCode()
{
ValidateCode vCode = new ValidateCode();
string code = vCode.CreateValidateCode(5);
Session["ValidateCode"] = code;
byte[] bytes = vCode.CreateValidateGraphic(code);
return File(bytes, @"image/jpeg");
}
调用方式为：在需要使用验证码的页面中，加入<img>标签：
<img id="valiCode" style="cursor: pointer;" src="../Account/GetValidateCode" alt="验证码" />
效果如下图：
到于Account/Login这个Action中的处理，只需加入对Session中验证码的判断：
Code
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Login(string userName, string password, bool rememberMe, string returnUrl,string code)
{
if (Session["ValidateCode"].ToString() != code)
{
ModelState.AddModelError("code", "validate code is error");
return View();
}
//此处验证用户名、密码
if (!ValidateLogOn(userName, password))
{
return View();
}
//验证成功
FormsAuthentication.SetAuthCookie(userName, rememberMe);
if (!String.IsNullOrEmpty(returnUrl))
{
return Redirect(returnUrl);
}
else
{
return RedirectToAction("Index", "Home");
}
}
为实现登录页中，点击图片切换验证码，可以登录页中加入此JS代码实现刷新验证码：
JS Code
<script type="text/javascript" src="http://www.cnblogs.com/Scripts/jquery-1.3.2-vsdoc.js"></script>
<script type="text/javascript">
$(function() {
$("#valiCode").bind("click", function() {
this.src = "../Account/GetValidateCode?time=" + (new Date()).getTime();
});
//alert("good");
});
</script>
至此，ASP.NET MVC中已成功实现验证码功能。