NSHTTPCookieStorage ios cookie

cookie機(jī)制采用的是在客戶端保持 HTTP 狀態(tài)信息的方案

Cookie是在瀏覽器訪問WEB服務(wù)器的某個(gè)資源時(shí)索绪，由WEB服務(wù)器在HTTP響應(yīng)消息頭中附帶傳送給瀏覽器的一個(gè)小文本文件恩闻。

一旦WEB瀏覽器保存了某個(gè)Cookie怪得，那么它在以后每次訪問該WEB服務(wù)器時(shí)尊勿，都會(huì)在HTTP請求頭中將這個(gè)Cookie回傳給WEB服務(wù)器。

底層的實(shí)現(xiàn)原理： WEB服務(wù)器通過在HTTP響應(yīng)消息中增加Set-Cookie響應(yīng)頭字段將Cookie信息發(fā)送給瀏覽器彤路，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(wù)器浅浮。

一個(gè)Cookie只能標(biāo)識(shí)一種信息沫浆，它至少含有一個(gè)標(biāo)識(shí)該信息的名稱（NAME）和設(shè)置值（VALUE）。

一個(gè)WEB站點(diǎn)可以給一個(gè)WEB瀏覽器發(fā)送多個(gè)Cookie滚秩，一個(gè)WEB瀏覽器也可以存儲(chǔ)多個(gè)WEB站點(diǎn)提供的Cookie专执。

瀏覽器一般只允許存放300個(gè)Cookie，每個(gè)站點(diǎn)最多存放20個(gè)Cookie郁油，每個(gè)Cookie的大小限制為4KB本股。

一、NSHTTPCookieStorage ?【轉(zhuǎn)自 http://rainbird.blog.51cto.com/211214/805173】

一直以為iOS的http請求這塊很簡單應(yīng)該不支持記錄桐腌，保存痊末，或者使用cookie，可是想當(dāng)然歸想當(dāng)然哩掺，真用的時(shí)候凿叠，真研究了一下發(fā)現(xiàn)還真強(qiáng)大。經(jīng)過一番的研究簡單說一下我的理解：當(dāng)你訪問一個(gè)網(wǎng)站時(shí)嚼吞，不管你愿意或者不愿意盒件，NSURLRequest都會(huì)幫你主動(dòng)記錄下來你訪問的站點(diǎn)設(shè)置的 cookie，而且很負(fù)責(zé)任的舱禽，當(dāng)你下次再訪問這個(gè)站點(diǎn)時(shí)炒刁，NSURLRequest會(huì)拿著上次保存下來了的cookie繼續(xù)去請求。這規(guī)律同樣適用于 ASIHTTPRequest誊稚。所以當(dāng)你做一些基于認(rèn)證的網(wǎng)絡(luò)請求時(shí)翔始，cookie不失為一個(gè)完美的解決方案。

那么怎么查看cookie呢里伯？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(dāng)前為空怎么辦呢城瞎？隨便請求一個(gè)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:

的東東疾瓮？這就是cookie啦

怎么清空cookie呢脖镀？

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(huì)查看cookie了狼电，也會(huì)清空cookie了蜒灰，怎么設(shè)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];

這樣就可以了肩碟。輸入一下强窖，是不是得到了下面這樣的結(jié)果：

二、

1.NSHttpCookiesStorage是一個(gè)單例削祈，管理所有的Cookie翅溺，每個(gè)Cookie都是一個(gè)NSHTTPCookie的實(shí)例，所有應(yīng)用的cookies都被保存在這個(gè)NSHTTPCookieStorage的單例中，并且跨進(jìn)程同步未巫。 ?但為了安全窿撬，每個(gè)應(yīng)用都有自己的沙盒启昧，A應(yīng)用的cookie是不能被B應(yīng)用訪問的叙凡。

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(huì)影響所有當(dāng)前正在使用cookie storage正在運(yùn)行的應(yīng)用密末。

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的問題握爷，即當(dāng)更改或者刪除一個(gè)cookie時(shí)，NSHTTPCookieStorage不是立即接收NSHTTPCookieManagerCookiesChangedNotification严里，然后進(jìn)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(dòng)的保存逾条，隔一段時(shí)間刷新厂庇，程序啟動(dòng)時(shí)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