using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.SessionState;

using System.IO;

namespace ZhengGong

{

    public class Global : System.Web.HttpApplication

    {

        protected void Application_Start(object sender, EventArgs e)

        {

            Application.Lock();

            Application["dateTime"] = DateTime.Now.ToShortDateString();

            Application["ipList"] = new List<string>();

            //默认总访问记录数为0

            Application["count"] = 0;

            //默认当前在线数为0

            Application["online"] = 0;

            //将当前人数写入文件中

            WriteCountPerson(0);

            Application.UnLock();

        }

        protected void Session_Start(object sender, EventArgs e)

        {

            //临时日期和系统记录的日期对比，若不相等表示不是同一天

            string tempDate = DateTime.Now.ToShortDateString();

            string appDate = Application["dateTime"].ToString();

            if (!tempDate.Equals(appDate))

            {

                Application["dateTime"] = tempDate;

                Application["ipList"] = null;

                int countNums = ReadCountPerson();

                WriteCountPerson(countNums + int.Parse(Application["count"].ToString()));

            }

            //发起会话的客户端IP地址

            string tempIp = Context.Request.UserHostAddress;

            //设置一个会话的作用时间为一分钟，即一分钟内不做任何操作的话，该会话就会失效。

            Session.Timeout = 1;

            //用于存储客户端的IP地址集合，若没有则表示是新的一天并且实例化出集合对象

            List<string> ipList = Application["ipList"] as List<string>;

            if (ipList == null)

            {

                ipList = new List<string>();        //如果ipList集合为空那么实例化他

            }

            //读取出文件中保存的总访问人数

            int countNums_2 = ReadCountPerson();

            if (!ipList.Contains(tempIp))

            {

                //在ip集合中添加客户端IP地址

                ipList.Add(tempIp);

                Application["ipList"] = ipList;

                //总访问数在文件中保存的数据累加1

                countNums_2 += 1;

                WriteCountPerson(countNums_2);

            }

            //当前在线人数累加1

            Application["online"] = (int)Application["online"] + 1;

            Application["count"] = countNums_2;

            Application.UnLock();

        }

        protected void Application_BeginRequest(object sender, EventArgs e)

        {

        }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)

        {

        }

        protected void Application_Error(object sender, EventArgs e)

        {

        }

        protected void Session_End(object sender, EventArgs e)

        {

            Application.Lock();

            Session.Abandon();                                            //当以一个会话结束后，注销该会话

            int online = int.Parse(Application["online"].ToString());

            if (online <= 0)

            {

                Application["online"] = 0;

            }

            else

            {

                Application["online"] = (int)Application["online"] - 1;

            }

            Application.UnLock();

        }

        protected void Application_End(object sender, EventArgs e)

        {

        }

        /// <summary>

        /// 写入网页总访问人数

        /// </summary>

        /// <param name="nums"></param>

        public void WriteCountPerson(int nums)

        {

            string filePath = System.Web.HttpRuntime.AppDomainAppPath + "ConfigFiles\\countPersonNums.ini";

            if (!File.Exists(filePath))

            {

                File.Create(filePath);

            }

            StreamWriter sw = new StreamWriter(filePath, false);

            sw.WriteLine("访问总数为:" + nums);

            sw.Flush();

            sw.Close();

        }

        /// <summary>

        /// 读取网页总访问人数

        /// </summary>

        public int ReadCountPerson()

        {

            try

            {

                int nums = 0;

                string filePath = System.Web.HttpRuntime.AppDomainAppPath + "ConfigFiles\\countPersonNums.ini";

                if (!File.Exists(filePath))

                {

                    return 0;

                }

                FileStream fs = new FileStream(filePath, FileMode.Open);

                StreamReader streamReader = new StreamReader(fs);

                string strLine = streamReader.ReadLine();

                string[] split = strLine.Split(':');

                if (split.Length <= 1)

                {

                    return 0;

                }

                int.TryParse(split[1], out nums);

                fs.Flush();

                fs.Close();

                streamReader.Close();

                streamReader.Dispose();

                return nums;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

    }

}