225 lines
8.0 KiB
C#
225 lines
8.0 KiB
C#
using System;
|
||
using System.Data;
|
||
using System.Configuration;
|
||
using System.Collections;
|
||
using System.Web;
|
||
using System.Web.Security;
|
||
using System.Web.UI;
|
||
using System.Web.UI.WebControls;
|
||
using System.Web.UI.WebControls.WebParts;
|
||
using System.Web.UI.HtmlControls;
|
||
using System.Drawing;
|
||
using System.Drawing.Imaging;
|
||
|
||
namespace Song.Site.Manage.Utility
|
||
{
|
||
/// <summary>
|
||
/// 生成计算公式的验证码？
|
||
/// </summary>
|
||
public partial class CalcImg : System.Web.UI.Page
|
||
{
|
||
//随机字符串的长度
|
||
int _maxResu = WeiSha.Common.Request.QueryString["max"].Int16 ?? 4;
|
||
//字符类型：1为加公式，2为加减，3为四则运算；
|
||
int _type = WeiSha.Common.Request.QueryString["type"].Int16 ?? 2;
|
||
//cookies的名称
|
||
string _name = WeiSha.Common.Request.QueryString["name"].String ?? "default";
|
||
/// <summary>
|
||
///
|
||
/// </summary>
|
||
/// <param name="Src"></param>
|
||
/// <param name="E"></param>
|
||
protected void Page_Load(Object Src, EventArgs E)
|
||
{
|
||
string opero = this.getOperator(_type);
|
||
int result = 0;
|
||
string formula = this.getFormula(_maxResu, opero, out result);
|
||
//存储随机数
|
||
HttpCookie cookie = new HttpCookie(_name);
|
||
cookie.Value = Md5(result.ToString());
|
||
Response.Cookies.Add(cookie);
|
||
|
||
//生成校验码的图片
|
||
ValidateCode(this, formula);
|
||
}
|
||
/// <summary>
|
||
/// 生成Md5加密码，Md5为不可逆加密
|
||
/// </summary>
|
||
/// <param name="str">需要加密的字符串</param>
|
||
/// <param name="code">Md5加密分16位与32位，此处应设16或32</param>
|
||
/// <returns>返回值为加密后的16位32位字符</returns>
|
||
public static string Md5(string str, int code)
|
||
{
|
||
if (code == 16) //16位MD5加密（取32位加密的9~25字符）
|
||
{
|
||
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
|
||
}
|
||
else//32位加密
|
||
{
|
||
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
|
||
}
|
||
}
|
||
/// <summary>
|
||
/// 生成Md5加密码，Md5为不可逆加密
|
||
/// </summary>
|
||
/// <param name="str">需要加密的字符串</param>
|
||
/// <returns>返回值为加密后的32位字符</returns>
|
||
public static string Md5(string str)
|
||
{
|
||
//16位MD5加密（取32位加密的9~25字符）
|
||
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
|
||
}
|
||
/// <summary>
|
||
/// 获取随机运算符
|
||
/// </summary>
|
||
/// <param name="type"></param>
|
||
/// <returns></returns>
|
||
private string getOperator(int type)
|
||
{
|
||
if (type == 1) return "+";
|
||
string num = "+,-,*,/";
|
||
string[] array = num.Split(',');
|
||
Random rand = new Random();
|
||
if (type == 2)
|
||
{
|
||
return array[rand.Next(2)];
|
||
}
|
||
return array[rand.Next(4) ];
|
||
}
|
||
/// <summary>
|
||
/// 获取计算公式
|
||
/// </summary>
|
||
/// <param name="max"></param>
|
||
/// <param name="operate"></param>
|
||
/// <returns></returns>
|
||
private string getFormula(int max, string operate,out int result)
|
||
{
|
||
Random rand = new Random();
|
||
int n1 = 0;
|
||
int n2 = 0;
|
||
result = 0;
|
||
string formula = "";
|
||
switch (operate)
|
||
{
|
||
case "+":
|
||
n1 = rand.Next(max);
|
||
n2 = rand.Next(max - n1);
|
||
formula = n1 + "+" + n2;
|
||
result = n1 + n2;
|
||
break;
|
||
case "-":
|
||
n1 = rand.Next(max);
|
||
n2 = rand.Next(n1);
|
||
formula = n1 + "-" + n2;
|
||
result = n1 - n2;
|
||
break;
|
||
}
|
||
return formula + "=?";
|
||
}
|
||
/// <summary>
|
||
/// 生成随机字符串，可以选择长度与类型
|
||
/// </summary>
|
||
/// <param name="VcodeNum">随机字符串的长度</param>
|
||
/// <param name="type">生成的随机数类型，0为数字与大小写字母，1为纯数字，2为纯小字母，3为纯大写字母，4为大小写字母，5数字加小写，6数字加大写，</param>
|
||
/// <returns></returns>
|
||
public static string RndNum(int VcodeNum, int type)
|
||
{
|
||
string Vchar;
|
||
//数字串
|
||
string num = "0,1,2,3,4,5,6,7,8,9,";
|
||
//小写字母
|
||
string lower = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,";
|
||
//大写字母
|
||
string upper = lower.ToUpper();
|
||
switch (type)
|
||
{
|
||
case 0:
|
||
Vchar = num + lower + upper;
|
||
break;
|
||
case 1:
|
||
Vchar = num;
|
||
break;
|
||
case 2:
|
||
Vchar = lower;
|
||
break;
|
||
case 3:
|
||
Vchar = upper;
|
||
break;
|
||
case 4:
|
||
Vchar = upper + lower;
|
||
break;
|
||
case 5:
|
||
Vchar = num + lower;
|
||
break;
|
||
case 6:
|
||
Vchar = num + upper;
|
||
break;
|
||
default:
|
||
Vchar = num + lower + upper;
|
||
break;
|
||
}
|
||
Vchar = Vchar.Substring(0, Vchar.Length - 1);
|
||
string[] VcArray = Vchar.Split(new Char[] { ',' });
|
||
string VNum = "";
|
||
Random rand = new Random();
|
||
for (int i = 1; i < VcodeNum + 1; i++)
|
||
{
|
||
VNum += VcArray[rand.Next(VcArray.Length)];
|
||
}
|
||
return VNum;
|
||
}
|
||
/// <summary>
|
||
/// 生成验证码的图片，将字符串填充到图片，并输出到数据流
|
||
/// </summary>
|
||
/// <param name="pg">页面，例如this</param>
|
||
/// <param name="checkCode">需要生成图片的字符串</param>
|
||
public static void ValidateCode(Page pg, string checkCode)
|
||
{
|
||
int iwidth = (int)(checkCode.Length * 13);
|
||
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 18);
|
||
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 };
|
||
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 < 20; 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(c.Length);
|
||
int findex = rand.Next(font.Length);
|
||
|
||
Font f = new System.Drawing.Font(font[findex], 12, System.Drawing.FontStyle.Bold);
|
||
Brush b = new System.Drawing.SolidBrush(c[cindex]);
|
||
//字符上下位置不同
|
||
int ii = 0;
|
||
if ((i + 1) % 2 == 0)
|
||
{
|
||
ii = 1;
|
||
}
|
||
g.DrawString(checkCode.Substring(i, 1), f, b, 1 + (i * 13), 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.Gif);
|
||
pg.Response.ClearContent();
|
||
pg.Response.ContentType = "image/Gif";
|
||
pg.Response.BinaryWrite(ms.ToArray());
|
||
g.Dispose();
|
||
image.Dispose();
|
||
}
|
||
}
|
||
}
|