異步POST請求解析JSON

 異步POST請求解析JSON

一、創建URL

NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/order"];
   
二、創建一個請求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
   
三、設置請求方法
request.HTTPMethod = @"POST";
   
五、設置請求體（請求參數）
// 創建一個描述訂單信息的JSON數據

NSMutableDictionary *orderInfo = [NSMutableDictionary dictionary];

orderInfo[@"shop_id"] = @"123”;

orderInfo[@"shop_name"] = @"123";

orderInfo[@"user_id"] = @"123";

// 將字典轉化成data

NSData *bodyData= [NSJSONSerialization dataWithJSONObject:orderInfo options:NSJSONWritingPrettyPrinted error:nil];
request.HTTPBody = bodyData;

   
六、設置請求頭：這次請求體的數據不再是普通的參數，而是一個JSON數據
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
   
七、發送請求
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
   if (data == nil || connectionError) return;
   NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
   NSString *error = dict[@"error"];
   if (error) {
         [MBProgressHUD showError:error];
   } else {
         NSString *success = dict[@"success"];
         [MBProgressHUD showSuccess:success];
   }
}];

注意：

 [NSJSONSerialization dataWithJSONObject:orderInfo options:NSJSONWritingPrettyPrinted error:nil]

將JSON轉化成二進制數據

[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];

將二進制數據轉成JSON

設置請求頭：這次請求體的數據不再是普通的參數，而是一個JSON數據
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];