一般处理程序生成验证码图片

    public void ProcessRequest (HttpContext context) {

        context.Response.ContentType = "image/jpeg";

        //获得验证码符号

        string code = GetCode();

        Image img = GetImage(code);

        //保存生成的验证码图片

        img.Save(context.Response.OutputStream, ImageFormat.Jpeg);

    }



    /// <summary>

    /// 生成验证码图片

    /// <summary>

    private Image GetImage(string code) {

        Bitmap bitmap = new Bitmap(85, 40);

        //画板

        Graphics g = Graphics.FromImage(bitmap);

        //在画板上输出符号

        g.DrawString(code, new Font("楷体", 24), Brushes.Green, 5, 5);

        return bitmap;

    }



    /// <summary>

    /// 获取验证码

    /// </summary>

    /// <returns></returns>

    private string GetCode() {

        string str = "0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ";

        string code = "";

        Random r = new Random();

        for (int i = 0; i < 4; i++) {

            //存储验证码符号

            code += str[r.Next(0, str.Length)];

        }

        return code;

    }

　　

 

下面是我用一般处理程序生成的10张验证码图片（给大家看看效果）