从iPhone Application Expressjs / Nodejs后端发送JSON发布数据

这是我的代码发送一个postjs后端请求。

CLLocation* location = [locationManager location]; CLLocationCoordinate2D coord = [location coordinate]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://50.63.172.74:8080/points"]]; //[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPMethod:@"POST"]; NSDictionary* jsonDict = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:coord.latitude], @"lat", [NSNumber numberWithFloat:coord.longitude], @"lng", nil];//dictionaryWithObjectsAndKeys:coord.latitude, nil] NSString *postString; NSError *error; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string error:&error]; if (! jsonData) { NSLog(@"Got an error: %@", error); } else { postString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]; } [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]]; (void)[[NSURLConnection alloc] initWithRequest:request delegate:self]; 

使用快递我得到request.body在服务器上，但它看起来像这样：

 { '{\n "lat" : 0.0,\n "lng" : 0.0\n}': '' } 

我不能通过说request.body.lat来访问它，因为它返回为undefined。 我希望身体看起来像：

 { "lat":0.0, "lng":0.0} 

任何想法如何使用快递做到这一点？

Answer 1

愿这帮助你。

请用您的实际坐标代替0.0

 NSArray *keys = [NSArray arrayWithObjects:@"lat", @"lng", nil]; NSArray *objects = [NSArray arrayWithObjects:@"0.0",@"0.0", nil]; NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; NSData *jsonData ; NSString *jsonString; if([NSJSONSerialization isValidJSONObject:jsonDictionary]) { jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:nil]; jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding]; } NSString *requestString = [NSString stringWithFormat: @"http://50.63.172.74:8080/points"]; NSURL *url = [NSURL URLWithString:requestString]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; [request setHTTPBody: jsonData]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"]; NSError *errorReturned = nil; NSURLResponse *theResponse =[[NSURLResponse alloc]init]; NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned]; if (errorReturned) { NSLog(@"Error %@",errorReturned.description); } else { NSError *jsonParsingError = nil; NSMutableArray *arrDoctorInfo = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError]; NSLog(@"Dict %@",arrDoctorInfo); } 

Answer 2

问题是，使用NSJSONSerialization获取包含JSON数据的NSData对象后，您可以从该数据创buildpostString 。 消除这个不必要的步骤，只是做：

 [request setHTTPBody:jsonData]; 

你应该在你的服务器端代码中得到预期的JSON。