imagepage.cs

如果不使用IIS,请先运行 XSP.exe,待提示已侦听 8080端口后

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;


public class ImagePage : System.Web.UI.Page
{
    /// <summary>
    /// 随机码认证
    /// </summary>
    /// <param name="code">生成认证长度</param>
    /// <param name="key">认证码值</param> 
    protected void DrawImage(int code,string key)
    {
        Session["CheckCode"] = key ; //Foosun.Common.Rand.Number(code);
        CreateImages(Session["CheckCode"].ToString());
    }
    /// <summary>
    /// /// 生成验证图片
    /// /// </summary>
    /// /// <param name="checkCode">验证字符</param>
    protected void CreateImages(string checkCode)
    {
        int iwidth = (int)(checkCode.Length * 15);
        System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 30);
        Graphics g = Graphics.FromImage(image);
        g.Clear(Color.LightCyan);
        //定义颜色
        Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple, Color.SkyBlue };
        //定义字体 
        string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体", "Comic Sans MS" };
        Random rand = new Random();
        //随机输出噪点
        for (int i = 0; i < 150; i++)
        {
            int x = rand.Next(image.Width);
            int y = rand.Next(image.Height);
            g.DrawPie(new Pen(Color.LightGray, 0), x, y, 6, 6, 1, 1);
        }
        Random r = new Random();
        //输出不同字体和颜色的验证码字符
        for (int i = 0; i < checkCode.Length; i++)
        {
            int cindex = rand.Next(7);
            int findex = rand.Next(6);
            Font fs_font = new System.Drawing.Font(font[findex], 14, System.Drawing.FontStyle.Bold);
            Brush b = new System.Drawing.SolidBrush(c[cindex]);
            int ii = 4;
            if ((i + 1) % 2 == 0)
            {
                ii = 2;
            }
            g.DrawString(checkCode.Substring(i, 1), fs_font, b, 3 + (i * 12), ii);

            // 加入和字体颜色相同的干扰线条
            g.DrawLine(new Pen(b, float.Parse("1." + r.Next(5).ToString())),
                 r.Next(i * 12 + 2),
                ii + r.Next(2, 20),
                12 + (i * 12),
                ii + r.Next(8, 19));


        }

        //画一个边框
        g.DrawRectangle(new Pen(Color.Red, 0), 100, 0, image.Width - 1, image.Height - 1);
        //输出到浏览器
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        Response.ClearContent();//Response.ClearContent();
        Response.ContentType = "image/Jpeg";
        Response.BinaryWrite(ms.ToArray());
        g.Dispose();
        image.Dispose();
    }
}