using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Web;using System.Web.Mvc;namespace Manage.Controllers{public class ValidateCodeController : Controller{//// GET: /ValidateCode/public FileContentResult GetCode(){//string code = GetRndStr();string code = GetNumAndStr(4);byte[] imageByte;using (Bitmap img = CreateImages(code, "ch")){imageByte = BitmapToByte(img);Session["validate"] = code;}return File(imageByte, "image/gif"); }public static byte[] BitmapToByte(Bitmap bitmap){using (MemoryStream stream = new MemoryStream()){bitmap.Save(stream, ImageFormat.Jpeg);byte[] data = new byte[stream.Length];stream.Seek(0, SeekOrigin.Begin);stream.Read(data, 0, Convert.ToInt32(stream.Length));return data;}}public bool IsReusable{get{return false;}}/// <summary>/// 数字随机数/// </summary>/// <returns></returns>private string GetRndNum(){string code = string.Empty;Random random = new Random();for (int i = 0; i < 4; i++){code += random.Next(9);}return code;}/// <summary>/// 英文随机/// </summary>/// <returns></returns>private string GetRndStr(){string Vchar = "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";string[] VcArray = Vchar.Split(‘,‘);string checkCode = string.Empty;Random rand = new Random();for (int i = 0; i < 4; i++){int t = rand.Next(VcArray.Length);checkCode += VcArray[t];}return checkCode;}/// <summary>/// 中文随机/// </summary>/// <returns></returns>private string GetRndCh(){System.Text.Encoding gb = System.Text.Encoding.Default;//获取GB2312编码页（表）object[] bytes = CreateRegionCode(4);//生4个随机中文汉字编码string[] str = new string[4];System.Text.StringBuilder sb = new System.Text.StringBuilder();for (int i = 0; i < 4; i++){//根据汉字编码的字节数组解码出中文汉字str[i] = gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[])));sb.Append(str[i].ToString());}return sb.ToString();}/// <summary>/// 产生随机中文字符/// </summary>/// <param name="strlength"></param>/// <returns></returns>private static object[] CreateRegionCode(int strlength){//定义一个字符串数组储存汉字编码的组成元素string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };Random rnd = new Random();object[] bytes = new object[strlength];for (int i = 0; i < strlength; i++){//区位码第1位int r1 = rnd.Next(11, 14);string str_r1 = rBase[r1].Trim();//区位码第2位rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);int r2;if (r1 == 13){r2 = rnd.Next(0, 7);}else{r2 = rnd.Next(0, 16);}string str_r2 = rBase[r2].Trim();//区位码第3位rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机种子int r3 = rnd.Next(10, 16);string str_r3 = rBase[r3].Trim();//区位码第4位rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);int r4;if (r3 == 10){r4 = rnd.Next(1, 16);}else if (r3 == 15){r4 = rnd.Next(0, 15);}else{r4 = rnd.Next(0, 16);}string str_r4 = rBase[r4].Trim();//定义两个字节变量存储产生的随机汉字区位码byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);//将两个字节变量存储在字节数组中byte[] str_r = new byte[] { byte1, byte2 };//将产生的一个汉字的字节数组放入object数组中bytes.SetValue(str_r, i);}return bytes;}public string GetNumAndStr(int length){string str = string.Empty;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,o,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,O,P,Q" +",R,S,T,U,V,W,X,Y,Z";string[] VcArray = Vchar.Split(new Char[] { ‘,‘ });//拆分成数组string[] num = new string[length];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 < length + 1; i++){if (temp != -1){rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));}int t = rand.Next(61);temp = t;str += VcArray[t];// num[i - 1] = VcArray[t]; } return str;}/// <summary>/// 画图片的背景图+干扰线 /// </summary>/// <param name="checkCode"></param>/// <returns></returns>private Bitmap CreateImages(string checkCode, string type){int step = 0;if (type == "ch"){step = 5;//中文字符，边界值做大}int iwidth = (int)(checkCode.Length * (13 + step));System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 22);Graphics g = Graphics.FromImage(image);g.Clear(Color.White);//清除背景色Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };//定义随机颜色string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };Random rand = new Random();for (int i = 0; i < 50; i++){int x1 = rand.Next(image.Width);int x2 = rand.Next(image.Width);int y1 = rand.Next(image.Height);int y2 = rand.Next(image.Height);g.DrawLine(new Pen(Color.LightGray, 1), x1, y1, x2, y2);//根据坐标画线}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], 10, 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 + step)), ii);}g.DrawRectangle(new Pen(Color.Silver, 0), 0, 0, image.Width - 1, image.Height - 1);System.IO.MemoryStream ms = new System.IO.MemoryStream();return image;}}}