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);