iOS：消息=“发生错误。”在JSON POST中

在java中工作，而不是在客观c中工作。 进入“Json Data Posted”状态后，数据不会保存在数据库中。 我应该以如下所示的格式发送数据以获得json响应

{ "ProjID": "78", "Uid": "12", "EmailID": "[e-mail]", "ProjectInviterFQAnswers": [{ "slno": "1", "Answer": "a1", "order": "1", "flag": "F" }, { "slno": "2", "Answer": "a1", "order": "2", "flag": "F" }, { "slno": "1", "Answer": "a1", "order": "2", "flag": "Q" } ] }; 

我发送日志中的字典，格式如下所示。

上面的代码和我的日志截图之间的差异是’;’ 在每个键值对之后，我得到标题中提到的响应。

有任何纠正代码/逻辑的建议吗？ 这是我编码的内容。

  NSError *error = Nil; NSOperationQueue *queue = [[NSOperationQueue alloc] init]; NSDictionary *dictionaryArray1 = [NSDictionary dictionaryWithObjectsAndKeys:@"1", @"slno", @"a1", @"Answer", @"1", @"order", @"F", @"Flag", nil]; NSDictionary *dictionaryArray2 = [NSDictionary dictionaryWithObjectsAndKeys:@"2", @"slno", @"a1", @"Answer", @"1", @"order", @"F", @"Flag", nil]; NSDictionary *dictionaryArray3 = [NSDictionary dictionaryWithObjectsAndKeys:@"1", @"slno", @"a1", @"Answer", @"2", @"order", @"Q", @"Flag", nil]; NSArray *arrayAnswer = [NSArray arrayWithObjects:dictionaryArray1, dictionaryArray2, dictionaryArray3, nil]; NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"78", @"ProjID", @"12", @"UID", @"[e-mail]", @"EmailID", arrayAnswer, @"ProjectInviterFQAnswer", nil]; NSLog(@"Dictionary that is being sent to URL is = %@", dictionary); NSURL *url = [NSURL URLWithString:@"http://cnapi.iconnectgroup.com/api/QRCodeScan/SaveAnswers"]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url]; NSData *requestData = [NSJSONSerialization dataWithJSONObject:dictionary options:kNilOptions error:&error]; [request setHTTPMethod:@"POST"]; [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"]; [request setHTTPBody: requestData]; NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [connection start]; [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ if(error || !data) { NSLog(@"JSON Data not posted!"); [activity stopAnimating]; UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Data not saved" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertMessage show]; } else { [activity startAnimating]; NSLog(@"JSON data posted! :)"); NSError *error = Nil; NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; NSLog(@"Response is %@", jsonObject); [activity stopAnimating]; } }]; } 

Answer 1

所以这就是我如何解决自己的问题。

  NSString *str = @"{\"ProjID\": \"78\",\"Uid\": \"12\",\"EmailID\": \"[e-mail]\","; str = [str stringByAppendingString:@"\"ProjectInviterFQAnswers\": ["]; str = [str stringByAppendingString:@"{\"slno\": \"1\",\"Answer\": \"a1\",\"order\": \"1\", \"flag\": \"F\"},"]; str = [str stringByAppendingString:@"{\"slno\": \"2\",\"Answer\": \"a1\",\"order\": \"1\",\"flag\": \"F\"},"]; str = [str stringByAppendingString:@"{\"slno\": \"1\",\"Answer\": \"a1\",\"order\": \"2\",\"flag\": \"Q\"}"]; str = [str stringByAppendingString:@"]}"]; NSLog(@"String is === %@", str); NSURL *url = [NSURL URLWithString:@"http://cnapi.iconnectgroup.com/api/QRCodeScan/SaveAnswers/"]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url]; NSData *requestData = [str dataUsingEncoding:NSUTF8StringEncoding]; [request setHTTPMethod:@"POST"]; [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"]; [request setHTTPBody: requestData]; NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [connection start]; [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ if(error || !data) { NSLog(@"JSON Data not posted!"); [activity stopAnimating]; UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Data not saved" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertMessage show]; } else { [activity startAnimating]; NSLog(@"JSON data posted! :)"); NSError *error = Nil; NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; NSLog(@"Response is %@", jsonObject); } }]; 

Answer 2

在我的情况下，我得到了同样的错误，问题是我将错误的数据发送到服务。 基本上，错误是由于使用该行设置错误的正文引起的：

 [request setHTTPBody: requestData]; 

之间，在iOS9中不推荐使用sendSynchronousRequest。 使用

 ... NSURLSessionDataTask * dataTask = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if(error || !data) { NSLog(@"JSON Data not posted!"); [activity stopAnimating]; UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Data not saved" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertMessage show]; } else { [activity startAnimating]; NSLog(@"JSON data posted! :)"); NSError *error = Nil; NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; NSLog(@"Response is %@", jsonObject); [activity stopAnimating]; } }] resume];