服务端生成验证码
来源:互联网 发布:雷军 罗永浩 知乎 编辑:程序博客网 时间:2024/04/29 22:55
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
//引入命名空间
using System.Drawing;
public partial class ValidateCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateImage(this.GenerateNumber(4));
}
//生成背景图片
private void CreateImage(string checkCode)
{
int iwidth = (int)(checkCode.Length * 15);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
Random rand = new Random();
//随机输出噪点
for (int i = 0; i < 50; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
}
//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(5);
Font f = new System.Drawing.Font(font[findex], 12, 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), f, b, 3 + (i * 12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black, 0), 0, 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.ContentType = "image/Jpeg";
Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
public string GenerateNumber(int codeLength)
{
string Vchar = "0,1,2,3,4,5,6,7,8,9";
string[] VcArray = Vchar.Split(',');
string VNum = "";
Random random = new Random();
for (int i = 1; i <= codeLength; i++)
{
int iNum = 0;
while ((iNum = Convert.ToInt32(VcArray.Length * random.NextDouble())) == VcArray.Length)
{
iNum = Convert.ToInt32(VcArray.Length * random.NextDouble());
}
VNum += VcArray[iNum];
}
Session["ValidateCode"] = VNum.ToString().Trim();
return VNum;
}
}
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