[转]Cookies揭秘 [Asp.Net, Javascript]

7.Cookies加密

8.Cookies与Ajax

四.Cookies最佳实践

（1）Asp.Net中保存Cookies

Response.Cookies["k1"].Value="k1Value";
Response.Cookies["k2"]["k2-1"]="k2-1Value";
Response.Cookies.Add(newHttpCookie("k3","k3Value"));

Request["k1"];
Request.Cookies["k1"].Value;
Request.Cookies["k2"]["k2-1"];
Request.Cookies.Get(0).Value;

（2）以对象方式保存Cookies

///<summary>
///Cookies基类。将需要保存Cookies的数据类此类派生，可以将强类型对象在Cookies中的保存和读取。
///</summary>
///<remarks>
///2009.8.6ziqiu.zhangcreated
///</remarks>
///<example>
///假设MyCookiesInfo是从从Cookies中获取对象：
///<code>
///CookieInfoitem=newCookieInfo();//new以后已经从Cookies中构造了对象。
///</code>
///将对象保存在Cookies中：
///<code>
///CookieInfoitem=newCookieInfo();
///item.value="testvalue";
///item.SetCookies("1");//Cookies有效期为1天
///</code>
///</example>
[System.Serializable]
publicclassCookieInfo
{

#region====================ConstructedMethod====================
///<summary>
///构造函数
///</summary>
publicCookieInfo()
{

}
#endregion

#region====================PublicMethod====================
///<summary>
///得到当前Cookies的过期时间
///</summary>
///<returns>过期时间</returns>
publicDateTimeGetExpiresTime()
{
stringcookieName=GetType().ToString();
if(HttpContext.Current.Request.Cookies[cookieName]!=null)
{
returnHttpContext.Current.Request.Cookies[cookieName].Expires;
}
returnDateTime.MinValue;
}

///<summary>
///保存Cookies，过期时间为浏览器关闭则失效。
///</summary>
///<paramname="expiresTime">Cookies过期事件</param>
///<returns>是否保存成功</returns>
publicboolSave()
{
returnthis.Save(DateTime.MinValue);
}

///<summary>
///保存Cookies，需要指定过期时间。
///</summary>
///<paramname="expiresTime">Cookies过期事件</param>
///<returns>是否保存成功</returns>
publicboolSave(DateTimeexpiresTime)
{
stringCookieName=GetType().ToString();
HttpCookieSessionCookie=null;

//对SessionId进行备份.
if(HttpContext.Current.Request.Cookies["ASP.NET_SessionId"]!=null)
{
stringSesssionId=HttpContext.Current.Request.Cookies["ASP.NET_SessionId"].Value.ToString();
SessionCookie=newHttpCookie("ASP.NET_SessionId");
SessionCookie.Value=SesssionId;

}
//设定cookie过期时间.
DateTimedtExpiry=expiresTime;
HttpContext.Current.Response.Cookies[CookieName].Expires=dtExpiry;

//设定cookie域名.
stringdomain=string.Empty;
if(HttpContext.Current.Request.Params["HTTP_HOST"]!=null)
{
//domain="www.elong.com";
domain=HttpContext.Current.Request.Params["HTTP_HOST"].ToString();
}

//如果是www.elong.com或多级域名,需要转化为elong.com
if(domain.IndexOf(".")>-1)
{
string[]temp=domain.Split('.');

if(temp.Length>=3)
{
domain=temp[temp.Length-2].Trim()+"."+temp[temp.Length-1].Trim();
}

HttpContext.Current.Response.Cookies[CookieName].Domain=domain;
}

//把类的属性,写入Cookie.
PropertyInfo[]Propertys=GetType().GetProperties();

foreach(PropertyInfopiinPropertys)
{
objectoj=pi.GetValue(this,null);
Typetype=pi.PropertyType;
stringvalueStr=string.Empty;

if(oj!=null&&oj.ToString()!=string.Empty)
{
if(type==Type.GetType("System.DateTime"))
{
valueStr=((DateTime)oj).ToString("yyyy/MM/ddHH:mm:ss",System.Globalization.DateTimeFormatInfo.InvariantInfo);
}
else
{
valueStr=oj.ToString();
}

HttpContext.Current.Response.Cookies[CookieName][pi.Name]=HttpUtility.UrlEncode(valueStr);
}

}

//如果cookie总数超过20个,重写ASP.NET_SessionId,以防Session丢失.
if(HttpContext.Current.Request.Cookies.Count>20&&SessionCookie!=null)
{
if(SessionCookie.Value!=string.Empty)
{
HttpContext.Current.Response.Cookies.Remove("ASP.NET_SessionId");
HttpContext.Current.Response.Cookies.Add(SessionCookie);
}
}

returntrue;
}

///<summary>
///找回Cookie值
///</summary>
publicvoidLoad()
{
stringcookieValue=string.Empty;
stringCookieName=GetType().ToString();

//通过遍历属性,从cookie中找回值,回写到属性.
PropertyInfo[]Propertys=GetType().GetProperties();

foreach(PropertyInfopiinPropertys)
{
try
{
cookieValue=HttpUtility.UrlDecode(HttpContext.Current.Request.Cookies[CookieName][pi.Name].ToString());
}
catch
{
cookieValue=string.Empty;
}

if(pi.CanWrite&&cookieValue!=null&&cookieValue!=string.Empty)
{
try
{
objectobb=cookieValue;
Typetype=pi.PropertyType;

obb=Convert.ChangeType(obb,type);
pi.SetValue(this,obb,null);
}
catch{}

}
}

}
#endregion

}

///<summary>
///保存Cookies的数据对象
///</summary>
[System.Serializable]
publicclassMyCookieInfo:CookieInfo
{
privateintm_Pkid=0;
publicintPkid
{
get
{
returnm_Pkid;
}
set
{
m_Pkid=value;
}
}

privatestringm_TestValue="";
publicstringTestValue
{
get
{
returnm_TestValue;
}
set
{
m_TestValue=value;
}
}

privateDateTimem_TestDateTime=DateTime.Now;
publicDateTimeTestDateTime
{
get
{
returnm_TestDateTime;
}
set
{
m_TestDateTime=value;
}
}
}

MyCookieInfotestCookies=newMyCookieInfo();
testCookies.Pkid=1;
testCookies.TestValue="中文测试";
testCookies.Save();

MyCookieInfotestCookies=newMyCookieInfo();
testCookies.Load();
this.lblMsg.Text="Pkid:"+testCookies.Pkid.ToString();
this.lblMsg.Text+=",TestValue:"+testCookies.TestValue.ToString();
this.lblMsg.Text+=",TestDateTime:"+
testCookies.TestDateTime.ToString("yyyy/MM/ddHH:mm:ss",
System.Globalization.DateTimeFormatInfo.InvariantInfo);

（3）使用Javascript操作Cookies

$.cookie("singleKey")

$.cookie("singleKey","","singleKey-value",{expires:1,path:"/",secure:false})

$.cookie("multiKey","subName1")

varsubNameObj={subName1:"aaa",subName2:"bbb",subName3:"ccc"};

$.cookie("multiKey","",subNameObj,{expires:1,path:"/",secure:false});

varmyDate=newDate();
myDate.setFullYear(2009,10,10);
$.cookie("singleKey","","singleKey-value",{expires:myDate,secure:false})

vartime=Date();

$.cookie("singleKey","","singleKey-value",{expires:1,path:"/",secure:false})