这两个东西,最近项目操作的比较少,不过这两个在Web项目开发中一直都扮演着很重要的角色,有时有些细节会不小心就遗忘掉。

Cookies  的概述

Cookies是由服务器端生成,发送给客户端,用来保存一些数据文本文件。在用户进行网页浏览时,这家伙会在客户端与服务器之前传递,常用作身份的验证、用户会话识别或存储小型数据。由于cookies是保存在客户端,那么就意味着用户可以修改和读取,因此有人利用木马、病毒窃取用户Cookies并获得用户信息,所以,作为开发人员,Cookies不适合保存重要或者涉及隐私的内容,除非你加密。(当然,作为用户,定期清理这些垃圾是一个好习惯~)

 

Cookies 的限制

大多数浏览器支持最大为4096个字节的Cookie,所以Cookie不适合保存大数据。 浏览器也会限制同一个站点下的Cookies数量,一般为20个,超出这个数量的话,旧的Cookie将会被丢弃。 用户可以禁用Cookie,如果禁用后会影响Session的信息保存(相关问题在后续会讲到)

Cookies  的操作

由System.Web.HttpCookie中可以看到.net 提供的Cookie的属性及方法

// 摘要:
// 提供创建和操作各 HTTP Cookie 的类型安全方法。
public sealed class HttpCookie
{
// 摘要:
// 创建并命名新的 Cookie。
//
// 参数:
// name:
// 新 Cookie 的名称。
public HttpCookie(string name);
//
// 摘要:
// 创建和命名新的 Cookie,并为其赋值。
//
// 参数:
// name:
// 新 Cookie 的名称。
//
// value:
// 新 Cookie 的值。
public HttpCookie(string name, string value); // 摘要:
// 获取或设置将此 Cookie 与其关联的域。
//
// 返回结果:
// 要将此 Cookie 与其关联的域名。默认值为当前域。
public string Domain { get; set; }
//
// 摘要:
// 获取或设置此 Cookie 的过期日期和时间。
//
// 返回结果:
// 此 Cookie 的过期时间(在客户端)。
public DateTime Expires { get; set; }
//
// 摘要:
// 获取一个值,通过该值指示 Cookie 是否具有子键。
//
// 返回结果:
// 如果 Cookie 具有子键,则为 true;否则为 false。默认为 false。
public bool HasKeys { get; }
//
// 摘要:
// 获取或设置一个值,该值指定 Cookie 是否可通过客户端脚本访问。
//
// 返回结果:
// 如果 Cookie 具有 HttpOnly 属性且不能通过客户端脚本访问,则为 true;否则为 false。默认值为 false。
public bool HttpOnly { get; set; }
//
// 摘要:
// 获取或设置 Cookie 的名称。
//
// 返回结果:
// 除非构造函数另外指定,否则默认值为 null 引用(在 Visual Basic 中为 Nothing)。
public string Name { get; set; }
//
// 摘要:
// 获取或设置要与当前 Cookie 一起传输的虚拟路径。
//
// 返回结果:
// 要与此 Cookie 一起传输的虚拟路径。默认值为当前请求的路径。
public string Path { get; set; }
//
// 摘要:
// 获取或设置一个值,该值指示是否使用安全套接字层 (SSL)(即仅通过 HTTPS)传输 Cookie。
//
// 返回结果:
// 如果通过 SSL 连接 (HTTPS) 传输 Cookie,则为 true;否则为 false。默认为 false。
public bool Secure { get; set; }
//
// 摘要:
// 获取或设置单个 Cookie 值。
//
// 返回结果:
// Cookie 的值。默认值为 null 引用(在 Visual Basic 中为 Nothing)。
public string Value { get; set; }
//
// 摘要:
// 获取单个 Cookie 对象所包含的键值对的集合。
//
// 返回结果:
// Cookie 值的集合。
public NameValueCollection Values { get; } // 摘要:
// 获取 System.Web.HttpCookie.Values 属性的快捷方式。此属性是为了与以前的 Active Server Pages (ASP)
// 版本兼容而提供的。
//
// 参数:
// key:
// Cookie 值的键(索引)。
//
// 返回结果:
// Cookie 值。
public string this[string key] { get; set; }

System.Web.HttpCookie(System.Web.dll, v4.0.0.0)

简单的操作如下

public ActionResult Index()
{
var cookie = new HttpCookie("MyCookieName", "string value");
//简单的Cookie
Response.Cookies.Add(cookie); var testCookies = new HttpCookie("MyCookiesInfo");
//默认属性
testCookies.Value = "丰富的Cookies";
//TestCookies.Domain = "testlocalhost";默认为当前网站跟域,如localhost,但如果你想设置域为testlocalhost,嘻嘻,自己试试
testCookies.Name = ""; //这里重置了该Cookies的名称,改为123456
//额外的属性
testCookies["TestAttr1"] = "再来个属性";
testCookies["TestAttr2"] = "再来个属性2";
//设置超时时间
testCookies.Expires = DateTime.Now.AddHours();
Response.Cookies.Add(testCookies);
return View();
} public ActionResult About()
{
string test = Request.Cookies["MyCookieName"].Value;
string test2 = Request.Cookies[""].Value;
string test3 = Request.Cookies[""]["TestAttr1"];
Response.Write(test + "|" + test2 + "|" + test3 + "|" + Request.Cookies[""].Expires.ToString());
return View();
}
 
About页面输出的结果是 “string value|丰富的Cookies&TestAttr1=再来个属性&TestAttr2=再来个属性2|再来个属性|0001/1/1 0:00:00 ­­”
aaarticlea/png;base64,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" alt="" />
这里可以看到一个cookie操作的特性
当浏览器向服务器发送 Cookie 信息时,并不包括有效期信息。(Cookie 的 Expires 属性始终返回值为 0 的日期时间值。)
即服务器不能获取cookie的有效时间来判断cookie是否已经过期。
那我们能不能改变cookie的有效时间让它提前过期呢?我们修改About的代码如下
           string test = Request.Cookies["MyCookieName"].Value;

            Request.Cookies["MyCookieName"].Value = "我要修改属性啦!";
            Response.Cookies["MyCookieName"].Expires = DateTime.Now.AddDays(-1);             string test2 = Request.Cookies["123456"].Value;
            string test3 = Request.Cookies["123456"]["TestAttr1"];
          
            Request.Cookies["123456"].Value = "我要修改属性啦!";
在执行Index时,cookie信息如下

aaarticlea/png;base64,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" alt="" />

到About页面时

aaarticlea/png;base64,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" alt="" />

只剩下123456这个cookie了,因为我们设置MyCookieName的超时时间比当前时间小,因此客户端自动将这个cookie删除了。

但请注意,123456的cookie值没有改变!!为什么??别急,我们先来看看我们在操作上述代码时,客户端与服务端是怎么沟通的?对,Http协议。

Http协议的详细内容就不在这啰嗦了,请去找度娘(屌丝程序员的最爱)。研究协议的最好方法还是抓包,抓包工具很多,以后应该会针对http协议有一篇总结,到时再详细说吧。

以下是请求Index时的一个抓包的部分截图

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" 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我们可以看到,服务端在HTTP的响应头中通过【Set-Cookie】的响应头来进行Cookie的设置
那么我们在访问About时,抓包截图如下

aaarticlea/png;base64,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" alt="" />

可以看到产生了一个【Set-Cookie】的响应头,将MyCookieName的Expires时间改变了(比较123456的Expires即可知MyCookieName的Expires变得比当前时间小,故删除操作是客户端自己完成的),因此,客户端就只剩下123456这个cookie了,那为什么123456的值没有改变呢?怎么改变呢?我们再来修改About的代码,增加如下代码
          var temp = new HttpCookie("");
temp = Request.Cookies[""];
temp["TestAttr1"] = "真的要改变属性值啦!";
Response.Cookies.Add(temp);

然后重新由Index页面跳转到About页面

aaarticlea/png;base64,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" alt="" />

抓包截图为

aaarticlea/png;base64,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" alt="" />

没错,这样才会产生一个【Set-Cookie】的响应头
因此操作cookie的另外一个特性为
服务端不能直接改变客户端的cookie值,包括超时时间也不能直接修改,需要重新建立一个对应名称的Cookie,然后重新对该Cookie下的的属性赋值,再添加到httpContext中,
超时时间也一样,只能重写
虽然修改不了Cookie,但可以取得,那服务端是如何拿到客户端的Cookie信息呢?
细心的朋友发现了刚才抓包截图中左侧为客户端请求头,很明显客户端(浏览器)在每次请求时会把cookie信息装进请求头中,这里还需要注意一点,我们保存在浏览器上的cookie非常多,难道每次请求都会把所有的cookie放到请求头去么?答案是否定的。
浏览器会检查当前要请求的域名以及目录, 只要这二项目与Cookie对应的Domain和Path匹配,才会发送。对于Domain则是按照尾部匹配的原则进行的。
 
最后补充一下和Cookie相关的一些操作
校验浏览器是否支持Cookies,不支持时可以提示用户
    if (Request.Browser.Cookies)
{
//浏览器支持cookies,继续coding......
}
else
{
//浏览器不支持cookies,那么弹出提示信息或者重定向到新页面进行处理
}

Js也能操作Cookies的,简单的例子如下

<script type="text/javascript">
function WriteCookie() {
var cookie = "cookie_js=22222222; path=/";
document.cookie = cookie;
}
function ReadCookie() {
alert(document.cookie);
}
</script>

读取的效果为

aaarticlea/png;base64,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" alt="" />

如果想对读取结果进行解析,请自行处理一下。

写的效果为

aaarticlea/png;base64,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" alt="" />


在前面的代码中,如果你设置  TestCookies.Domain = "testlocalhost" 该cookie将不会被创建,大家能说说是什么原因么?
												

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