本文實(shí)例講述了asp.net實(shí)現(xiàn)拒絕頻繁的IP訪問(wèn)的方法。分享給大家供大家參考，具體如下：
首先我們要實(shí)現(xiàn) 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>
/// 單個(gè)IP最大連接限制數(shù)量
/// /summary>
private int rowCount = Convert.ToInt32(ConfigurationSettings.AppSettings["HttpRowCount"]);
/// summary>
/// 指定區(qū)域時(shí)間范圍 單位分
/// /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 類
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>
/// 累加數(shù)量
/// /summary>
public int Count
{
get { return count; }
set { count = value; }
}
}
[Serializable]
public class CartIp
{
public CartIp()
{
if (_listIp == null)
{
_listIp = new ListListIp>();
}
}
private ListListIp> _listIp;
public ListListIp> _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;
}
}
//判斷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>
/// 獲得IP的數(shù)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 配置訪問(wèn)規(guī)則
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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