using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;
using System.Drawing.Imaging;
namespace test
{
public partial class verCode : System.Web.UI.Page
{
protected void Page_Load(
object sender, EventArgs e)
{
if (!
IsPostBack)
{
GenerateCode();
}
}
private void GenerateCode()
{
Random r =
new Random();
string code =
"";
for (
int i =
0; i <
5; i++
)
{
code += r.Next(
0,
10);
}
//字体
string[] fonts = {
"微软雅黑",
"宋体",
"黑体",
"仿宋",
"隶书"};
//字体颜色
Color[] colors =
{ Color.Red,Color.Black,Color.Blue,Color.Orange,Color.Yellow };
//创建位图
Bitmap bmp =
new Bitmap(
100,
30);
//创建GDI
Graphics g =
Graphics.FromImage(bmp);
//清空画布
g.Clear(Color.White);
//创建画笔
Pen pen =
new Pen(Color.Green);
//设置线的宽度
pen.Width =
2;
//划线添加干扰
for (
int i =
0; i <
50; i++
)
{
Point p1 =
new Point(r.Next(
0, bmp.Width), r.Next(
0, bmp.Height));
Point p2 =
new Point(r.Next(
0, bmp.Width), r.Next(
0, bmp.Height));
//划线
g.DrawLine(pen, p1, p2);
}
for (
int i =
0; i <
5; i++
)
{
Font font =
new Font(fonts[r.Next(
0,
5)],
20,FontStyle.Bold);
SolidBrush brush =
new SolidBrush(colors[r.Next(
0,
5)]);
Point p =
new Point(i*
20,
0);
//画文本内容
g.DrawString(code[i].ToString(),font,brush,p);
}
//添加斑点
for (
int i =
0; i <
500; i++
)
{
//对位图添加斑点
bmp.SetPixel(r.Next(
0,bmp.Width),r.Next(
0,bmp.Height),Color.Lime);
}
//保存位图
bmp.Save(Response.OutputStream, ImageFormat.Gif);
//设置相应类型
Response.ContentType =
"image/gif";
bmp.Dispose();
g.Dispose();
}
}
}
转载于:https://www.cnblogs.com/zoro-zero/p/4041689.html
相关资源：ASP.NET 生成验证码
