using System;
|
using System.Collections.Generic;
|
using System.DrawingCore;
|
using System.DrawingCore.Imaging;
|
using System.IO;
|
using System.Text;
|
|
namespace JiepeiWMS.Services
|
{
|
/// <summary>
|
/// 简单的图形验证码生成
|
/// </summary>
|
public class VierificationCodeServices
|
{
|
|
/// <summary>
|
/// 生成验证码
|
/// </summary>
|
/// <param name="length">指定验证码的长度</param>
|
/// <returns></returns>
|
public string CreateValidateCode(int length)
|
{
|
var randMembers = new int[length];
|
var validateNums = new int[length];
|
var validateNumberStr = "";
|
//生成起始序列值
|
var seekSeek = unchecked((int)DateTime.Now.Ticks);
|
var seekRand = new Random(seekSeek);
|
var beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
|
var seeks = new int[length];
|
for (var i = 0; i < length; i++)
|
{
|
beginSeek += 10000;
|
seeks[i] = beginSeek;
|
}
|
//生成随机数字
|
for (var i = 0; i < length; i++)
|
{
|
var rand = new Random(seeks[i]);
|
var pownum = 1 * (int)Math.Pow(10, length);
|
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
|
}
|
//抽取随机数字
|
for (var i = 0; i < length; i++)
|
{
|
var numStr = randMembers[i].ToString();
|
var numLength = numStr.Length;
|
var rand = new Random();
|
var numPosition = rand.Next(0, numLength - 1);
|
validateNums[i] = int.Parse(numStr.Substring(numPosition, 1));
|
}
|
//生成验证码
|
for (var i = 0; i < length; i++)
|
{
|
validateNumberStr += validateNums[i].ToString();
|
}
|
return validateNumberStr;
|
}
|
|
/// <summary>
|
/// 该方法用于生成指定位数的随机数
|
/// </summary>
|
/// <param name="VcodeNum">参数是随机数的位数</param>
|
/// <returns>返回一个随机数字符串</returns>
|
private string RndNum(int VcodeNum)
|
{
|
//验证码可以显示的字符集合
|
string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,p" +
|
",q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,P,Q" +
|
",R,S,T,U,V,W,X,Y,Z";
|
string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组
|
string code = "";//产生的随机数
|
int temp = -1;//记录上次随机数值，尽量避避免生产几个一样的随机数
|
|
Random rand = new Random();
|
//采用一个简单的算法以保证生成随机数的不同
|
for (int i = 1; i < VcodeNum + 1; i++)
|
{
|
if (temp != -1)
|
{
|
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));//初始化随机类
|
}
|
int t = rand.Next(61);//获取随机数
|
if (temp != -1 && temp == t)
|
{
|
return RndNum(VcodeNum);//如果获取的随机数重复，则递归调用
|
}
|
temp = t;//把本次产生的随机数记录起来
|
code += VcArray[t];//随机数的位数加一
|
}
|
return code;
|
}
|
|
/// <summary>
|
/// 该方法是将生成的随机数写入图像文件
|
/// </summary>
|
/// <param name="code">code是一个随机数</param>
|
/// <param name="numbers">生成位数（默认4位）</param>
|
public MemoryStream Create(out string code, int numbers = 4)
|
{
|
code = RndNum(numbers);
|
Bitmap Img = null;
|
Graphics g = null;
|
MemoryStream ms = null;
|
Random random = new Random();
|
//验证码颜色集合
|
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
|
|
//验证码字体集合
|
string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
|
|
|
//定义图像的大小，生成图像的实例
|
Img = new Bitmap((int)code.Length * 18, 32);
|
|
g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象
|
|
g.Clear(Color.White);//背景设为白色
|
|
//在随机位置画背景点
|
for (int i = 0; i < 100; i++)
|
{
|
int x = random.Next(Img.Width);
|
int y = random.Next(Img.Height);
|
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
|
}
|
//验证码绘制在g中
|
for (int i = 0; i < code.Length; i++)
|
{
|
int cindex = random.Next(7);//随机颜色索引值
|
int findex = random.Next(5);//随机字体索引值
|
Font f = new Font(fonts[findex], 15, FontStyle.Bold);//字体
|
Brush b = new SolidBrush(c[cindex]);//颜色
|
int ii = 4;
|
if ((i + 1) % 2 == 0)//控制验证码不在同一高度
|
{
|
ii = 2;
|
}
|
g.DrawString(code.Substring(i, 1), f, b, 3 + (i * 12), ii);//绘制一个验证字符
|
}
|
ms = new MemoryStream();//生成内存流对象
|
Img.Save(ms, ImageFormat.Jpeg);//将此图像以Png图像文件的格式保存到流中
|
|
//回收资源
|
g.Dispose();
|
Img.Dispose();
|
return ms;
|
}
|
}
|
}
|
