0x00、背景：

1、用戶訪問網站所有頁面就將訪問統計數加1 ，按每月存放。

2、站點並沒有用到母版面來實現，所有各個頁面都很獨立。

3、網站是很早這前的網站，盡量省改動以前的代碼。按理說我們應該做一個第三方統計來處理會更好，

但應客戶要求還要弄到一個站點下！實際情況是盡量小改頁面就好！

0x01、核心代碼：

1、實現Http攔截操作，核心代碼就是這一個了：

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.Diagnostics;
 
using System.IO;
using System.Linq;
using System.Web;
using System.Xml;

namespace HYSWare.Web
{
    public class CurVisitCount {
        public DateTime BeginTime{get;set;}
        public int Count { get; set; }
    }

    public class RequestHandler : IHttpModule
    {
        private static System.Timers.Timer timer1;
        
 
private static System.Web.Caching.Cache _Cache;
        private int _IntervalMinute;

        public int IntervalMinute
        {
            get
            {
                string _IntervalMinuteStr = ConfigurationManager.AppSettings["IntervalMinute"];

                if (string.IsNullOrEmpty(_IntervalMinuteStr))
                {
                    _IntervalMinute 
 
= 5;
                }
                else
                {
                    _IntervalMinute = Convert.ToInt32(_IntervalMinuteStr);
                }

                return _IntervalMinute;
            }
        }

        public RequestHandler()
        {
            if (_Cache == null)
            {
                _Cache = new System.Web.Caching.Cache();
            }
            if (timer1 == null)
            {
                timer1 = new System.Timers.Timer();
                
                timer1.Interval = IntervalMinute * 60000;
                timer1.Elapsed += new System.Timers.ElapsedEventHandler(timer1_Tick);
                timer1.AutoReset = true;//設置是執行一次（false）還是一直執行(true)； 
                timer1.Enabled = true;//是否執行System.Timers.Timer.Elapsed事件；
            }
            if(_Cache["CurVisitCount"]==null)
            _Cache["CurVisitCount"] = new CurVisitCount { BeginTime = DateTime.Now, Count = 0 };
            if(_Cache["VisitCount"]==null)
            _Cache["VisitCount"] = "0";
        }


        void IHttpModule.Dispose()
        {
        }

        void IHttpModule.Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
            //context.EndRequest += new EventHandler(context_EndRequest);
        }

        void context_BeginRequest(object sender, EventArgs e)
        {
            string[] requestEx = { ".aspx",".htm", ".html"};

            HttpApplication application = (HttpApplication)sender;
            var curRequest = application.Context.Request;
            if (requestEx.Contains(curRequest.CurrentExecutionFilePathExtension)) {
            if (_Cache["CurVisitCount"] == null)
                _Cache["CurVisitCount"]=new CurVisitCount { BeginTime = DateTime.Now, Count = 1 };
            CurVisitCount curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];
            if (curVisitCount.BeginTime.Year + curVisitCount.BeginTime.Month < DateTime.Now.Year + DateTime.Now.Month)
            {
                UpdateVisitCount(curVisitCount.BeginTime);
                curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];
            }
            curVisitCount.Count += 1;
            _Cache["CurVisitCount"] = curVisitCount;

            if (_Cache["VisitCountXml"] == null)
                _Cache["VisitCountXml"] = GetVisitCountInXml();
            int visitCountXml = 0;
            int.TryParse(_Cache["VisitCountXml"].ToString(),out visitCountXml);

            _Cache["VisitCount"] = (visitCountXml + curVisitCount.Count).ToString();

            }
            //application.Context.Response.Write("自定義ModuleRequest開始");
        }

        private int GetVisitCountInXml()
        {
            int ret = 0;
            string _VisitPath = AppDomain.CurrentDomain.BaseDirectory + "App_Data\\Xml\\VisitCountData.xml";
            XmlDocument doc = new XmlDocument();
            if (File.Exists(_VisitPath))
            {
                doc.Load(_VisitPath);
                var curNode = doc.SelectNodes("//Visit");
                foreach (XmlNode m in curNode) {
                    var countAttr = m.Attributes.GetNamedItem("VCount");
                    int v = 0;
                    int.TryParse(countAttr.Value, out v);
                    ret += v;
                }
            }
            return ret;
        }

        private void UpdateVisitCount(DateTime time)
        {
            if (_Cache["CurVisitCount"] == null)
                _Cache["CurVisitCount"]= new CurVisitCount { BeginTime = DateTime.Now, Count = 0 };
            CurVisitCount curVisitCount = (CurVisitCount)_Cache["CurVisitCount"];
            if (curVisitCount.Count > 0)
            {
                string _VisitPath = AppDomain.CurrentDomain.BaseDirectory + "App_Data\\Xml\\VisitCountData.xml";
                XmlDocument doc = new XmlDocument();

                if (File.Exists(_VisitPath))
                {
                    doc.Load(_VisitPath);
                    var curNode = doc.SelectSingleNode(string.Format("//Visit[@Year=‘{0}‘ and @Month=‘{1}‘]", time.Year, time.Month));
                    if (curNode != null)
                    {
                        var countAttr = curNode.Attributes.GetNamedItem("VCount");
                        int count = 0;
                        int.TryParse(countAttr.Value, out count);
                        countAttr.Value = (count + curVisitCount.Count).ToString();
                    }
                    else
                    {
                        //有文件但沒有本月數據
                        XmlNode root = doc.SelectSingleNode("Visits");
                        XmlElement element1 = doc.CreateElement("Visit");
                        element1.SetAttribute("Year", time.Year.ToString());
                        element1.SetAttribute("Month", time.Month.ToString());
                        element1.SetAttribute("VCount", curVisitCount.Count.ToString());
                        root.AppendChild(element1);
                    }
                }
                else
                {
                    XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
                    doc.AppendChild(dec);

                    //創建一個根節點（一級）
                    XmlElement root = doc.CreateElement("Visits");
                    doc.AppendChild(root);
                    //創建節點（二級）
                    XmlElement element1 = doc.CreateElement("Visit");
                    element1.SetAttribute("Year", time.Year.ToString());
                    element1.SetAttribute("Month", time.Month.ToString());
                    element1.SetAttribute("VCount", curVisitCount.ToString());
                    root.AppendChild(element1);
                }
                doc.Save(_VisitPath);

                _Cache["VisitCountXml"] = GetVisitCountInXml();
                _Cache["VisitCount"] = _Cache["VisitCountXml"];
                _Cache["CurVisitCount"] = new CurVisitCount { BeginTime = DateTime.Now, Count = 0 };
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            UpdateVisitCount(DateTime.Now);
        }
    }
}

2、web.config中添加配置

<!--
  有關如何配置 ASP.NET 應用程序的詳細信息，請訪問
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
  <appSettings>
    ......
    <!--設置更新訪問統計Xml,間隔時間（分鐘）默認為5分鐘-->
    <add key="IntervalMinute" value="5"/>
  </appSettings>
　.......
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <add name="customerModule" type="HYSWare.Web.RequestHandler, HYSWare.Web"/>
    </modules>
        ......
  </system.webServer>
</configuration>

3、存放數據的XML文件

<?xml version="1.0" encoding="utf-8"?>
<Visits>
  <Visit Year="2017" Month="8" VCount="92" />
  <Visit Year="2017" Month="7" VCount="13000000" />
</Visits>

4、取得緩存的的訪問數據 VisitCountHandler.ashx，VisitCountHandler.ashxcs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace HYSWare.Web
{
    /// <summary>
    /// VisitCountHandler 的摘要說明
    /// </summary>
    public class VisitCountHandler : IHttpHandler
    {
        private static System.Web.Caching.Cache _Cache;

        public VisitCountHandler() {
            if (_Cache == null)
            {
                _Cache = new System.Web.Caching.Cache();
            }
        }

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            if (_Cache["VisitCount"] == null)
                _Cache["VisitCount"] = "0";
            context.Response.Write(_Cache["VisitCount"].ToString());
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

5、調用取訪問統計數據的有js代碼

var visitCount = 0;
        $.ajax({
            type: "Post",
            url: "VisitCountHandler.ashx",
            data: "{}",
            async: false,
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {
                visitCount = data;
            },
            error: function (err) {
                alert(err);
            }
        });

0x02、總結：

主要還是覺得緩存使用感覺有點不對的樣子，也許有更好的方法！

還有覺得攔截方法也是挻好用的！

asp.net 訪問頁面訪問統計實現