NSHTTPCookieStorage ios cookie

cookie機制采用的是在客戶端保持 HTTP 狀態信息的方案

Cookie是在瀏覽器訪問WEB服務器的某個資源時，由WEB服務器在HTTP響應消息頭中附帶傳送給瀏覽器的一個小文本文件。

一旦WEB瀏覽器保存了某個Cookie，那么它在以后每次訪問該WEB服務器時，都會在HTTP請求頭中將這個Cookie回傳給WEB服務器。

底層的實現原理： WEB服務器通過在HTTP響應消息中增加Set-Cookie響應頭字段將Cookie信息發送給瀏覽器，瀏覽器則通過在HTTP請求消息中增加Cookie請求頭字段將Cookie回傳給WEB服務器。

一個Cookie只能標識一種信息，它至少含有一個標識該信息的名稱（NAME）和設置值（VALUE）。

一個WEB站點可以給一個WEB瀏覽器發送多個Cookie，一個WEB瀏覽器也可以存儲多個WEB站點提供的Cookie。

瀏覽器一般只允許存放300個Cookie，每個站點最多存放20個Cookie，每個Cookie的大小限制為4KB。

一、NSHTTPCookieStorage ?【轉自 http://rainbird.blog.51cto.com/211214/805173】

一直以為iOS的http請求這塊很簡單應該不支持記錄，保存，或者使用cookie，可是想當然歸想當然，真用的時候，真研究了一下發現還真強大。經過一番的研究簡單說一下我的理解：當你訪問一個網站時，不管你愿意或者不愿意，NSURLRequest都會幫你主動記錄下來你訪問的站點設置的 cookie，而且很負責任的，當你下次再訪問這個站點時，NSURLRequest會拿著上次保存下來了的cookie繼續去請求。這規律同樣適用于 ASIHTTPRequest。所以當你做一些基于認證的網絡請求時，cookie不失為一個完美的解決方案。

那么怎么查看cookie呢？很簡單：

NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];

for (NSHTTPCookie *cookie in [cookieJar cookies]) {

NSLog(@"%@", cookie);

}

這樣就列出了所有已保存的cookie,如果當前為空怎么辦呢？隨便請求一個url嘍。

NSURLRequest *request = [NSURLRequest requestWithURL:

[NSURL URLWithString:@"http://blog.cnrainbird.com"]

cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData? ? timeoutInterval:3];

[NSURLConnection sendSynchronousRequest:request

returningResponse:nil

error:nil];

NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];

for (NSHTTPCookie *cookie in [cookieJar cookies]) {

NSLog(@"%@", cookie);

}

是不是得到了類似:

的東東？這就是cookie啦

怎么清空cookie呢？

NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];

NSArray *_tmpArray = [NSArray arrayWithArray:[cookieJar cookies]];

for (id obj in _tmpArray) {

[cookieJar deleteCookie:obj];

}

這樣cookie就消失的一干二凈了。

會查看cookie了，也會清空cookie了，怎么設置指定的cookie呢？

NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];

[cookieProperties setObject:@"username" forKey:NSHTTPCookieName];

[cookieProperties setObject:@"rainbird" forKey:NSHTTPCookieValue];

[cookieProperties setObject:@"cnrainbird.com" forKey:NSHTTPCookieDomain];

[cookieProperties setObject:@"cnrainbird.com" forKey:NSHTTPCookieOriginURL];

[cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];

[cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];

NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];

這樣就可以了。輸入一下，是不是得到了下面這樣的結果：

二、

1.NSHttpCookiesStorage是一個單例，管理所有的Cookie，每個Cookie都是一個NSHTTPCookie的實例，所有應用的cookies都被保存在這個NSHTTPCookieStorage的單例中，并且跨進程同步。 ?但為了安全，每個應用都有自己的沙盒，A應用的cookie是不能被B應用訪問的。

iOS Note: Cookies are not shared among applications in iOS.

2. cookie的接收模式有3種

NSHTTPCookieAcceptPolicyAlways,NSHTTPCookieAcceptPolicyNever,NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain

如果改變cookie的接收模式，會影響所有當前正在使用cookie storage正在運行的應用。

Note:Changes made to the cookie accept policy affect all currently running applications using the cookie storage.

3.Session cookies (where the cookie object’sisSessionOnlymethod returnsYES) are local to a single process and are not shared.

4.NSHTTPCookieStorage的問題，即當更改或者刪除一個cookie時，NSHTTPCookieStorage不是立即接收NSHTTPCookieManagerCookiesChangedNotification，然后進行更改，而是有5s的延遲，

參考：http://stackoverflow.com/questions/5837702/nshttpcookiestorage-state-not-saved-on-app-exit-any-definitive-knowledge-docume

和http://www.cocoabuilder.com/archive/cocoa/195413-nshttpcookiestorage-notification-troubles.html

一般解決方法是把cookie手動的保存，隔一段時間刷新，程序啟動時再從NSDefaultUser中讀出

NSHTTPCookieStorage state not saved on app exit. Any definitive knowledge/documentation out there?

I also got the same problem but i found a solution. I saved the cookies as it get created by the browser and then recreate them as app restarts.

1) Save cookie when they get created by uiwebview.

NSMutableArray *cookieArray = [[NSMutableArray alloc] init];

for (NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {

[cookieArray addObject:cookie.name];

NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];

[cookieProperties setObject:cookie.name forKey:NSHTTPCookieName];

[cookieProperties setObject:cookie.value forKey:NSHTTPCookieValue];

[cookieProperties setObject:cookie.domain forKey:NSHTTPCookieDomain];

[cookieProperties setObject:cookie.path forKey:NSHTTPCookiePath];

[cookieProperties setObject:[NSNumber numberWithInt:cookie.version] forKey:NSHTTPCookieVersion];

[cookieProperties setObject:[[NSDate date] dateByAddingTimeInterval:2629743] forKey:NSHTTPCookieExpires];

[[NSUserDefaults standardUserDefaults] setValue:cookieProperties forKey:cookie.name];

[[NSUserDefaults standardUserDefaults] synchronize];

}

[[NSUserDefaults standardUserDefaults] setValue:cookieArray forKey:@"cookieArray"];

[[NSUserDefaults standardUserDefaults] synchronize];

2) Now recreate them as app restarts:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

NSMutableArray* cookieDictionary = [[NSUserDefaults standardUserDefaults] valueForKey:@"cookieArray"];

NSLog(@"cookie dictionary found is %@",cookieDictionary);

for (int i=0; i < cookieDictionary.count; i++)

{

NSLog(@"cookie found is %@",[cookieDictionary objectAtIndex:i]);

NSMutableDictionary* cookieDictionary1 = [[NSUserDefaults standardUserDefaults] valueForKey:[cookieDictionary objectAtIndex:i]];

NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieDictionary1];

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];

}

// other code