ps：下面实例是每隔30秒访问次数不超过3次

1、Filter：

using Infrastructure.Log;
using Infrastructure.Web;
using Lemon.Stats.Model;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;namespace Lemon.Stats.Apis
{/// <summary>/// 限制单个IP短时间内访问次数/// </summary>[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)]public class IPActionFilterAttribute : ActionFilterAttribute{/// <summary>/// 限制单个IP短时间内访问次数/// </summary>/// <param name="actionContext"></param>public override void OnActionExecuting(HttpActionContext actionContext){string ip = HttpHelper.GetClientIp(actionContext.Request);//var isValid = IPCacheHelper.CheckIsAble(ip);IPCacheInfoModel ipModel =  IPCacheHelper.GetIPLimitInfo(ip);if (!ipModel.IsVisit){Logger.Warn(string.Format("IP【{0}】被限制了【{1}】次数",ipModel.IP,ipModel.Limit));actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, "系统正忙，请稍微再试。");return;}base.OnActionExecuting(actionContext);}}
}

2、IPCacheHelper：

using Lemon.Stats.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Lemon.Stats.Apis
{/// <summary>/// 限制单个IP访问次数/// </summary>public class IPCacheHelper{/// <summary>         /// IP缓存集合          /// </summary>       private static List<IPCacheInfoModel> dataList = new List<IPCacheInfoModel>();private static object lockObj = new object();/// <summary>        /// 一段时间内，最大请求次数,必须大于等于1///</summary> private static int maxTimes = 3;/// <summary>  /// 一段时间长度（单位秒)，必须大于等于1     /// </summary>private static int partSecond = 30;/// <summary>  /// 请求被拒绝是否加入请求次数    /// </summary>  private static bool isFailAddIn = false;static IPCacheHelper(){ }/// <summary>      /// 设置时间，默认maxTimes=3, partSecond=30         /// </summary>        /// <param name="_maxTimes">最大请求次数</param>        /// <param name="_partSecond">请求单位时间</param>         public static void SetTime(int _maxTimes, int _partSecond){maxTimes = _maxTimes;partSecond = _partSecond;}/// <summary>    /// 检测一段时间内，IP的请求次数是否可以继续请求和使用  /// </summary>        /// <param name="ip">ip</param>   /// <returns></returns>       public static bool CheckIsAble(string ip){lock (lockObj){var item = dataList.Find(p => p.IP == ip);if (item == null){item = new IPCacheInfoModel();item.IP = ip;item.ReqTime.Add(DateTime.Now);dataList.Add(item);return true;}else{if (item.ReqTime.Count > maxTimes){item.ReqTime.RemoveAt(0);}var nowTime = DateTime.Now;if (isFailAddIn){#region 请求被拒绝也需要加入当次请求item.ReqTime.Add(nowTime);if (item.ReqTime.Count >= maxTimes){if (item.ReqTime[0].AddSeconds(partSecond) > nowTime){return false;}else{return true;}}else{return true;}#endregion}else{#region 请求被拒绝就不需要加入当次请求了if (item.ReqTime.Count >= maxTimes){if (item.ReqTime[0].AddSeconds(partSecond) > nowTime){return false;}else{item.ReqTime.Add(nowTime);return true;}}else{item.ReqTime.Add(nowTime);return true;}#endregion}}}}/// <summary>    /// 检测一段时间内，IP的请求次数是否可以继续请求和使用  /// </summary>        /// <param name="ip">ip</param>   /// <returns></returns>       public static IPCacheInfoModel GetIPLimitInfo(string ip){lock (lockObj){var item = dataList.Find(p => p.IP == ip);if (item == null) //IP开始访问{item = new IPCacheInfoModel();item.IP = ip;item.ReqTime.Add(DateTime.Now);dataList.Add(item);item.IsVisit = true; //可以继续访问return item;}else{if (item.ReqTime.Count > maxTimes){item.ReqTime.RemoveAt(0);}var nowTime = DateTime.Now;if (isFailAddIn){#region 请求被拒绝也需要加入当次请求item.ReqTime.Add(nowTime);if (item.ReqTime.Count >= maxTimes){if (item.ReqTime[0].AddSeconds(partSecond) > nowTime){item.Limit++; //限制次数+1item.IsVisit = false;//不能继续访问return item;}else{item.IsVisit = true; //可以继续访问return item; //单个IP30秒内 没有多次访问}}else{item.IsVisit = true; //可以继续访问return item; //单个IP访问次数没有达到max次数}#endregion}else{#region 请求被拒绝就不需要加入当次请求了if (item.ReqTime.Count >= maxTimes){if (item.ReqTime[0].AddSeconds(partSecond) > nowTime){item.Limit++; //限制次数+1item.IsVisit = false;//不能继续访问return item;}else{item.ReqTime.Add(nowTime);item.IsVisit = true; //可以继续访问return item;}}else{item.ReqTime.Add(nowTime);item.IsVisit = true; //可以继续访问return item;}#endregion}}}}}
}

3、IPCacheInfoModel：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Lemon.Stats.Model
{public class IPCacheInfoModel{/// <summary>/// IP /// </summary>public string IP { get; set; }/// <summary>/// 限制次数/// </summary>public int Limit { get; set; }/// <summary>/// 是否可以访问/// </summary>public bool IsVisit { get; set; }/// <summary>/// 访问时间/// </summary>private List<DateTime> reqTime = new List<DateTime>();/// <summary>/// 访问时间/// </summary>public List<DateTime> ReqTime{get { return this.reqTime; }set { this.reqTime = value; }}}
}

4、Action：

/// <summary>/// IP,PV(VV),UV,注册用户点击量统计/// 先执行IPActionFilter过滤器，再执行ChannelActionFilter过滤器/// 先执行后面的过滤器，再执行前面的过滤器，执行方式倒序执行顺序/// </summary>[ChannelActionFilter, IPActionFilter, RoutePrefix("Stats")]public class StatsController : ApiController{/// <summary>/// 每次页面点击都统计数据，直接由客户端调用/// Header中加入SecretKey,AppKey,UniqueKey/// </summary>/// <returns></returns>[HttpGet, Route("")]public async Task Get(){}}