iOS9.0之后NSURLConnection被注銷，采用NSURLSession，先介紹NSURLSession，然后介紹NSURLConnection

1.NSURLSession：

post請求：

//1.NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];request.HTTPMethod=@"POST";request.HTTPBody = [@"" dataUsingEncoding:NSUTF8StringEncoding];//2.NSURLSession *session=[NSURLSession sharedSession];NSURLSessionDataTask *dataTask= [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {NSLog(@"NSURLSession加載數(shù)據(jù)。。。。post。。。。。%@",data);}];//3.[dataTask resume];

創(chuàng)建請求并設置代理delegate:(NSURLSessionDataDelegate)

//1.確定請求路徑NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];//2.創(chuàng)建請求對象//請求對象內部默認已經(jīng)包含了請求頭和請求方法（GET）NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.獲得會話對象,并設置代理/*第一個參數(shù)：會話對象的配置信息defaultSessionConfiguration 表示默認配置第二個參數(shù)：誰成為代理，此處為控制器本身即self第三個參數(shù)：隊列，該隊列決定代理方法在哪個線程中調用，可以傳主隊列|非主隊列[NSOperationQueue mainQueue] 主隊列： 代理方法在主線程中調用[[NSOperationQueue alloc]init] 非主隊列： 代理方法在子線程中調用 */NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];//4.根據(jù)會話對象創(chuàng)建一個Task(發(fā)送請求）NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request];//5.執(zhí)行任務[dataTask resume];

delegate協(xié)議方法：

//1.接收到服務器響應的時候調用該方法 -(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{//在該方法中可以得到響應頭信息，即responseNSLog(@"didReceiveResponse--%@",[NSThread currentThread]);completionHandler(NSURLSessionResponseAllow);//注意：需要使用completionHandler回調告訴系統(tǒng)應該如何處理服務器返回的數(shù)據(jù)//默認是取消的/*NSURLSessionResponseCancel = 0, 默認的處理方式，取消NSURLSessionResponseAllow = 1, 接收服務器返回的數(shù)據(jù)NSURLSessionResponseBecomeDownload = 2,變成一個下載請求NSURLSessionResponseBecomeStream 變成一個流*/ }//2.接收到服務器返回數(shù)據(jù)的時候會調用該方法，如果數(shù)據(jù)較大那么該方法可能會調用多次 -(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{NSLog(@"didReceiveData--%@",[NSThread currentThread]);//拼接服務器返回的數(shù)據(jù) } //3.當請求完成(成功|失敗)的時候會調用該方法，如果請求失敗，則error有值-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {NSLog(@"didCompleteWithError--%@",[NSThread currentThread]);if(error == nil){//解析數(shù)據(jù),JSON解析請參考 }}

?2.NSURLConnection

普通請求：

/* //1.網(wǎng)址NSURL *url=[NSURL URLWithString:@"http://www.baidu.com"];//2.請求NSURLRequest *request=[NSURLRequest requestWithURL:url];//3.隊列NSOperationQueue *queue=[[NSOperationQueue alloc]init];//4.發(fā)送異步請求[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse * response, NSData * data, NSError * connectionError) {NSString *content=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];NSLog(@"加載成功：%@",content);}];*///同步發(fā)送，要放到另一個線程里，防止阻塞；dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];NSURLResponse *response;NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];//&指的是指針；NSString *content=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];NSLog(@"NSURLConnection加載數(shù)據(jù)。。。。。。。：%@",content);});

代理請求：(NSURLConnectionDataDelegate)

NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];// NSURLResponse *response; [NSURLConnection connectionWithRequest:request delegate:self];

代理協(xié)議方法：

// -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{NSLog(@"接到response"); }
// -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{NSLog(@"接收數(shù)據(jù)");}
// -(void)connectionDidFinishLoading:(NSURLConnection *)connection{NSLog(@"接收數(shù)據(jù)完成");}

?參考網(wǎng)址：http://www.cnblogs.com/wendingding/p/5168772.html

轉載于:https://www.cnblogs.com/sunjianfei/p/5570578.html

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