同步网络通信步骤

 //同步网络通信

    //1.构建URL地址

    NSURL *url = [NSURL URLWithString:@"http://piao.163.com/m/cinema/list.html?app_id=1&mobileType=iPhone&ver=2.6&channel=appstore&deviceId=9E89CB6D-A62F-438C-8010-19278D46A8A6&apiVer=6&city=110000"];

    //2.构建请求NSURLRequest

    

//    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url

//                                                 cachePolicy:NSURLRequestReturnCacheDataElseLoad

//                                             timeoutInterval:60];

    

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    

    //设置请求方式(get or post)

    [request setHTTPMethod:@"GET"];

    

    //设置超时时间

    [request setTimeoutInterval:60];

    

    //设置请求头信息

    [request setValue:@"gzip" forHTTPHeaderField:@"Accept-Encoding"];

//    [request addValue:<#(NSString *)#> forHTTPHeaderField:<#(NSString *)#>]

//    [request setAllHTTPHeaderFields:<#(NSDictionary *)#>]

    

    //设置请求体(post)

//    [request setHTTPBody:<#(NSData *)#>];

    

    //设置缓存

    [request setCachePolicy:NSURLRequestReturnCacheDataElseLoad];

    

    //3.构建NSURLCollection,发送网络请求

    NSHTTPURLResponse *response = nil;

    NSError *error = nil;

    NSData *data = [NSURLConnection sendSynchronousRequest:request

                                         returningResponse:&response

                                                     error:&error];

    //4.获取数据显示

    //将data转为字符串

    NSString *jsonData = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

    self.textView.text = jsonData;

    

    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

    NSLog(@"数据结果:%@",dic);

    

    //5.获取响应信息

    NSInteger statusCode = response.statusCode;

    NSDictionary *allHeaderFields = response.allHeaderFields;

    NSLog(@"statusCode:%ld",statusCode);

    NSLog(@"allHeaderFields: %@",allHeaderFields);