asp.net MVC 在Controller控制器中实现验证码输出功能

 asp.net mvc项目使用到验证码，为了让以前的WebForm代码能利用上代码经过稍微的改动即可使用代码如下：

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Mvc;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace Angel.Web.Controllers
{
public class CheckCodeController : Controller
{
//
// GET: /CheckCode/
public ActionResult Index()
{
this.CreateCheckCodeImage(GenerateCheckCode());
return View();
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
if (code == '0' || code == 'o' || code == 'L' || code == 'I')
{
i = i - 1;
}
else
{
checkCode += code.ToString();
}
}
// Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
Session.Contents["checkcode"] = checkCode;
return checkCode;
}
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 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);
//画图片的背景噪音线
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 System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
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);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
}

　　最后别忘了session的获取设置，需要在Global.asax.cs文件中新增如下代码：

/// <summary>
/// MVC为了获取session参数
/// </summary>
public override void Init()
{
PostAuthenticateRequest += (s, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
base.Init();
}
void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)
{
HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
}

html页面代码：

html代码

<img name="img1" id="img1" style="position:absolute;top:5px;right:36px!important;z-index:1000;" alt="单击图片刷新验证码" src="CheckCode/Index" <br>onclick="JavaSccript:reloadImage('CheckCode/Index');" /><br><script type="text/javascript">
function reloadImage(url) {
document.getElementById("img1").src = url + '?abc=' + Math.random();
}
</script>

总结

以上所述是小编给大家介绍的asp.net MVC 在Controller控制器中实现验证码输出功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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