本文实例讲述了asp.net实现拒绝频繁的IP访问的方法。分享给大家供大家参考，具体如下：
首先我们要实现 IHttpModule接口
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.SessionState;
using System.Configuration;
namespace MyHttp
{
public class UrlReWrite : IHttpModule
{
/// <summary>
/// 单个IP最大连接限制数量
/// </summary>
private int rowCount = Convert.ToInt32(ConfigurationSettings.AppSettings["HttpRowCount"]);
/// <summary>
/// 指定区域时间范围 单位分
/// </summary>
private int httpTime = Convert.ToInt32(ConfigurationSettings.AppSettings["HttpTime"]);
public void Init(HttpApplication application)
{
application.BeginRequest += (new
EventHandler(this.Application_BeginRequest));
application.EndRequest += (new
EventHandler(this.Application_EndRequest));
}
private void Application_BeginRequest(Object source, EventArgs e)
{
HttpApplication Application = (HttpApplication)source;
HttpContext ctx = Application.Context;
//IP地址
string isIp = ctx.Request.UserHostAddress;
if (ctx.Application["time"] == null)
{
ctx.Application["time"] = DateTime.Now;
}
else
{
DateTime isTime = (DateTime)ctx.Application["time"];
int timeTract = Convert.ToInt32(DateTime.Now.Subtract(isTime).Minutes.ToString());
if (timeTract > (httpTime - 1))
{
ctx.Application["time"] = null;
ctx.Application["myip"] = null;
}
}
if (ctx.Application["myip"] != null && ctx.Application["myip"] is CartIp)
{
CartIp cartIp = (CartIp)ctx.Application["myip"];
cartIp.Insert(isIp);
ctx.Application["myip"] = cartIp;
if (cartIp.GetCount(isIp) > rowCount)
{
ctx.Response.Clear();
ctx.Response.Close();
}
}
else
{
CartIp cartIp = new CartIp();
cartIp.Insert(isIp);
HttpContext.Current.Application["myip"] = cartIp;
}
}
private void Application_EndRequest(Object source, EventArgs e)
{
}
public void Dispose()
{
}
}
}
ListIp 类
using System;
using System.Collections.Generic;
using System.Text;
namespace MyHttp
{
[Serializable]
public class ListIp
{
private string ip;
private int count;
/// <summary>
/// IP地址
/// </summary>
public string IP
{
get { return ip; }
set { ip = value; }
}
/// <summary>
/// 累加数量
/// </summary>
public int Count
{
get { return count; }
set { count = value; }
}
}
[Serializable]
public class CartIp
{
public CartIp()
{
if (_listIp == null)
{
_listIp = new List<ListIp>();
}
}
private List<ListIp> _listIp;
public List<ListIp> _ListIp
{
get { return _listIp; }
set { _listIp = value; }
}
/// <summary>
/// 添加IP
/// </summary>
public void Insert(string ip)
{
int indexof = ItemLastInfo(ip);
if (indexof == -1)
{
//不存在
ListIp item = new ListIp();
item.IP = ip;
_listIp.Add(item);
}
else
{
_listIp[indexof].Count += 1;
}
}
//判断IP是否存在
public int ItemLastInfo(string ip)
{
int index = 0;
foreach (ListIp item in _ListIp)
{
if (item.IP == ip)
{
return index;//存在
}
index += 1;
}
return -1;//不存在
}
/// <summary>
/// 获得IP的数量
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public int GetCount(string ip)
{
foreach (ListIp item in _ListIp)
{
if (item.IP == ip)
{
return item.Count;//存在
}
}
return -1;//不存在
}
}
}
在web.config 配置访问规则
<appSettings> <add key="HttpRowCount" value="100"/> <add key="HttpTime" value="10"/> </appSettings> <system.web> <httpModules> <add name="UrlReWrite" type="MyHttp.UrlReWrite"/> </httpModules> </system.web>
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