• .net 验证码


    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Drawing;
    using System.Drawing.Imaging;
    
    public partial class Admin_verify : System.Web.UI.Page
    {
        private int codelen = 4; //验证码长度
        private int finenes = 85; //图片清晰度
        private int imageHeight = 24;//图片高度
        private int imgWidth = 48; //图片宽度
        private string fontfamily = "微软雅黑"; //字体样式
        private int fontsize = 14; //字体大小
        private int x = 0; //x坐标
        private int y = 0; //y坐标
        
        
        protected void Page_Load(object sender, EventArgs e)
        {
            //验证码
    
            string validateCode = CreateCodeVerfiy();//生成验证码 
            Bitmap bitmap = new Bitmap(imgWidth, imageHeight);//生成Bitmap图像 
            ImageBig(bitmap); //图像背景 
            DrewValidateCode(bitmap, validateCode);//绘制验证码图像 
            bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);//保存图像,等待输出 
    
    
        }
        //验证码数字的生成
        protected string CreateCodeVerfiy() 
        {
            string code = "";
            Random rd = new Random();
            for (int i = 0; i < codelen; i++) 
            {
                int n = rd.Next(10); //随机生成4个数字
                code += n.ToString();
            }
            Session["verify"] = code;
            return code;
        }
    
        //干扰点生成
        protected void ImageBig(Bitmap bimtmp) 
        {
            Random rd = new Random();
            for (int i = 0; i < bimtmp.Width; i++) 
            {
                for (int j = 0; j < bimtmp.Height; j++) 
                {
                    if (rd.Next(90) <= this.finenes) 
                    {
                        bimtmp.SetPixel(i, j, Color.LightBlue);
                    }
                }
            }
        }
    
        private void DrewValidateCode(Bitmap bitmap, string validateCode)//绘制验证码图像 
        {
            Graphics g = Graphics.FromImage(bitmap);//获取绘制器对象 
            Font font = new Font(fontfamily, fontsize, FontStyle.Bold);//设置绘制字体 
            g.DrawString(validateCode, font, Brushes.Black, x, y);//绘制验证码图像 
        } 
    }
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  • 原文地址:https://www.cnblogs.com/mengluo/p/6109783.html
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