ASP.NET中实现Session的负载均衡
据我目前所知有2种方法,如下:
1、利用微软提供的解决方案
参考网址:http://blog.maartenballiauw.be/post/2008/01/23/ASPNET-Session-State-Partitioning.aspx
2、利用第三方组件,比如:Memcached
我们排除第二种方法,只说第一种方法。
在ASP.NET中Session的存储方式有3种:
1、IIS进程
2、ASP.NET State Service服务
3、SqlServer数据库
好,我们来分析一下,将Session放入IIS进程肯定是不行的,将Session放入SqlServer数据库中性能方面可能大打折扣,最好是放在ASP.NET State Service中。
下面说一下步骤:
1、在命令行键入services.msc打开服务窗口,开启ASP.NET State Service,仅仅这样还不行,还需要在注册表修改HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection的值,改为1即可。
2、新建解决方案MySession,里面包含一个Web项目:MySession和一个类库:App
3、在类库下面新建一类文件:PartitionResolver.cs,内容为:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace App { public class PartitionResolver : System.Web.IPartitionResolver { #region Private members private String[] partitions; #endregion #region IPartitionResolver Members public void Initialize() { // Create an array containing // all partition connection strings // // Note that this could also be an array // of SQL server connection strings! partitions = new String[] { "tcpip=192.168.1.17:42424", "tcpip=192.168.1.18:42424" }; } public string ResolvePartition(object key) { // Accept incoming session identifier // which looks similar like "2ywbtzez3eqxut45ukyzq3qp" string sessionId = key as string; // Create your own manner to divide session id's // across available partitions or simply use this one! int partitionID = Math.Abs(sessionId.GetHashCode()) % partitions.Length; return partitions[partitionID]; } #endregion } }
注意:可能需要引用System.Web,而且服务器IP列表自行斟酌修改,端口保持不变
4、在MySession Web项目中引用类库App
5、在MySession Web项目中的Web.config的<system.web>节点里面添加<sessionState mode="StateServer" partitionResolverType="App.PartitionResolver"/>
6、新建Default.aspx页面,cs代码如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace MySession { public partial class Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (Session["test"] == null) { Session["test"] = "Test"; } Response.Write(Session["test"]); } } }
7、新建ShowSession.aspx页面,cs代码如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace MySession { public partial class ShowSession : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Response.Write(Session["test"]); } } }
按照我说的来,应该是没有问题的。简单吧?
而且还支持同一个顶级域名的跨域访问,不信自己试试。
如果有多台Web服务器,到时候可能还要注意machineKey