共享Session、单点登录解决方案(ASP.NET2.0)

利用序列化机制实现Session共享的原理：

1、Web Server 1的应用程序序列化Session信息为文本值（可以是Binary或Soap格式）

2、将序列化后的值写入文件，保存到File Server上

3、Web Server 2 对保存在File Server上的Session序列化后的值进行反序列化

4、在Web Server 2上重新构建Session值


下面我们来详细看看实现代码，分以下几个步骤：


1、创建一个类库工程：ShareSession

引入以下的命名空间：

System.configuration
System.Runtime.Serialization.Formatters.Soap
System.Web

2、创建一个类：SessionEntity

代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ShareSession
...{
/**//* *****************************
*
*Author:Xiaojun Liu
*Create Date :2007.11.09
*Description :
*
* *****************************
*/



[Serializable]
public class SessionEntity
...{
[NonSerialized]
public string AUTH_GUID = "";

private Hashtable _HtShareSession;

public Hashtable HtShareSession
...{
get
...{
return this._HtShareSession;
}
set
...{
this._HtShareSession = value;
}
}


public SessionEntity(string guid)
...{
this.AUTH_GUID = guid;
}

}//


}//



3、创建一个序列化、反序列化操作的类：ShareSessionFormatter

代码如下：

using System;
using System.Web;
using System.Data;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization.Formatters.Soap;
using System.Runtime.Serialization.Formatters.Binary;
using System.Collections;
using System.IO;

namespace ShareSession
...{

/**//* *****************************
*
*Author:Xiaojun Liu
*Create Date :2007.11.09
*Description :
*
* *****************************
*/


/** <summary>
/// 格式化操作器
/// </summary>
public class ShareSessionFormatter
...{

private static string _ShareSessionPath = System.Configuration.ConfigurationManager.AppSettings["ShareSessionPath"].ToString();

/** <summary>
/// 序列化格式器类型
/// </summary>
public enum FormatterType
...{
Binary,
Soap
};

/** <summary>
/// 执行序列化
/// </summary>
/// <param name="formatterType">类型</param>
public static void Serialize(FormatterType formatterType)
...{
if (HttpContext.Current.Session["AUTH_GUID"] == null)
...{
HttpContext.Current.Session["AUTH_GUID"] = Guid.NewGuid().ToString();
}
Hashtable ht = new Hashtable();

//遍历Session
foreach (string key in HttpContext.Current.Session.Contents.Keys)
...{
ht.Add(key, HttpContext.Current.Session[key]);
}

/**/执行序列化
switch (formatterType)
...{
case FormatterType.Binary:
BinarySerialize(ht);
break;
case FormatterType.Soap:
SoapSerialize(ht);
break;
default:
break;
}

}

/** <summary>
/// 按照Binary格式序列化
/// </summary>
/// <param name="ht"></param>
private static void BinarySerialize(Hashtable ht)
...{
string guid = HttpContext.Current.Session["AUTH_GUID"].ToString();
SessionEntity obj = new SessionEntity(guid);
obj.HtShareSession = ht;

// 创建一个文件guid.xml
Stream stream = File.Open(_ShareSessionPath + guid + ".xml", FileMode.Create);
BinaryFormatter formatter = new BinaryFormatter();

//执行序列化
formatter.Serialize(stream, obj);
stream.Close();

// 将对象置空
obj = null;
}

/** <summary>
/// 按照Soap格式序列化
/// </summary>
/// <param name="ht"></param>
private static void SoapSerialize(Hashtable ht)
...{
string guid = HttpContext.Current.Session["AUTH_GUID"].ToString();
SessionEntity obj = new SessionEntity(guid);
obj.HtShareSession = ht;

// 创建一个文件guid.xml
Stream stream = File.Open(_ShareSessionPath + guid + ".xml", FileMode.Create);
SoapFormatter formatter = new SoapFormatter();

//执行序列化
formatter.Serialize(stream, obj);
stream.Close();

// 将对象置空
obj = null;
}


/** <summary>
/// 反序列化
/// </summary>
/// <param name="formatterType">传送端的Session["AUTH_GUID"]</param>
/// <param name="guid"></param>
public static void Deserialize(FormatterType formatterType, string guid)
...{
switch (formatterType)
...{
case FormatterType.Binary:
BinaryDeserialize(guid);
break;
case FormatterType.Soap:
SoapDeserialize(guid);
break;
default:
break;
}
}


/** <summary>
/// 以Binary方式反序列化
/// </summary>
private static void BinaryDeserialize(string guid)
...{
SessionEntity obj = new SessionEntity(guid);

// 打开文件guid.xml
Stream stream = File.Open(_ShareSessionPath + guid + ".xml", FileMode.Open);
BinaryFormatter formatter = new BinaryFormatter();

obj = (SessionEntity)formatter.Deserialize(stream);
stream.Close();

Hashtable ht = obj.HtShareSession;
obj = null;

//遍历ht，生成Session
CreateSession(ht);
}

/** <summary>
/// 以Soap方式反序列化
/// </summary>
private static void SoapDeserialize(string guid)
...{
SessionEntity obj = new SessionEntity(guid);

// 打开文件guid.xml
Stream stream = File.Open(_ShareSessionPath + guid + ".xml", FileMode.Open);
SoapFormatter formatter = new SoapFormatter();

obj = (SessionEntity)formatter.Deserialize(stream);
stream.Close();

Hashtable ht = obj.HtShareSession;
obj = null;

//遍历ht，生成Session
CreateSession(ht);
}

/** <summary>
/// 遍历Hashtable，同时创建Session
/// </summary>
/// <param name="ht"></param>
private static void CreateSession(Hashtable ht)
...{
foreach (DictionaryEntry de in ht)
...{
HttpContext.Current.Session[de.Key.ToString()] = de.Value;
}
}


}//
}//



4、编译项目，生成ShareSession.dll

5、把ShareSession.dll引入Web Server 1上的应用程序中，同时在Web.config文件中增加配置字节

代码如下：

<!-- Session信息序列化后保存路径 -->
<add key="ShareSessionPath" value="C:\ShareSession\"/>


6、在Web Server 1上的应用程序中新建一个页面，功能是初始化Session，然后把Session信息序列化，代码如下：


前台代码：

<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="ShareSession.aspx.cs" Inherits="Front_Test_ShareSession" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns=" http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Session共享</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lHttp_Cookie" runat="server" Text=""></asp:Label>
<a href=" http://localhost:5000/Front/Test/ShareSession.aspx?AUTH_GUID=<%=AUTH_GUID %>">Go Other Web Site(port:5000)</a>
</div>
</form>
</body>
</html>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Front_Test_ShareSession : System.Web.UI.Page
...{
public string AUTH_GUID = "";

protected void Page_Load(object sender, EventArgs e)
...{
Session.Clear();
Session.Abandon();
Session.Add("USER_ID", "2002");
Session.Add("USER_NAME", "Xiaojun Liu");

ShareSession.ShareSessionFormatter.Serialize(ShareSession.ShareSessionFormatter.FormatterType.Soap);
AUTH_GUID = Session["AUTH_GUID"].ToString();


}
}



7、在Web Server 2上进行第5步操作

8、在Web Server 2上的应用程序中新建一个页面，功能是反序列化，还原Session，同时读取Session信息进行测试，代码如下：

前台代码：

<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="ShareSession.aspx.cs" Inherits="Front_Test_ShareSession" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns=" http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Session共享</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lHttp_Cookie" runat="server" Text=""></asp:Label>
</div>
</form>
</body>
</html>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Front_Test_ShareSession : System.Web.UI.Page
...{
protected void Page_Load(object sender, EventArgs e)
...{
string guid = Request.Params["AUTH_GUID"].ToString();
ShareSession.ShareSessionFormatter.Deserialize(ShareSession.ShareSessionFormatter.FormatterType.Soap,guid);

Response.Write("USER_ID = "+Session["USER_ID"].ToString()+"<br />");
Response.Write("USER_NAME = "+Session["USER_NAME"].ToString()+"<br />");
Response.Write("AUTH_GUID = " + Session["AUTH_GUID"].ToString() + "<br />");
}
}



此例子只是提供了一种解决思路，在应用过程中应根据项目不同进行调整及详细设计。