JSON POST在iOs中不起作用

我试图使用JSON POST方法发布一些数据到Web服务，我已经尝试了很多方法来做到这一点，但没有任何工作。 这是我的代码，请检查：

NSArray *objects=[NSArray arrayWithObjects:@"value1", @"value2",@"value3", @"value4",@"value5", @"value6",@"value7", @"value8",@"value9", nil] ; NSArray *keys=[NSArray arrayWithObjects:@"FirstName", @"LastName",@"UserName", @"Password",@"Email", @"Gender",@"DeviceId", @"DeviceName",@"ProfileImage", nil]; NSData *_jsonData=nil; NSString *_jsonString=nil; NSURL *url=[NSURL URLWithString:urlstring]; NSDictionary *JsonDictionary=[NSDictionary dictionaryWithObjects:objects forKeys:keys]; if([NSJSONSerialization isValidJSONObject:JsonDictionary]){ _jsonData=[NSJSONSerialization dataWithJSONObject:JsonDictionary options:0 error:nil]; _jsonString=[[NSString alloc]initWithData:_jsonData encoding:NSUTF8StringEncoding]; } NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; // [request setHTTPBody:_jsonData]; // [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; // [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; // [request setValue:[NSString stringWithFormat:@"%d", [_jsonData length]] forHTTPHeaderField:@"Content-Length"]; [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; NSString *finalString = [_jsonString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; [request setHTTPBody:[finalString dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]]; // //return and test NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; 

请检查。

Answer 1

这里是一个示例代码，试图注册一个用户。 点击“注册”button，写下面的代码：

  - (IBAction)registerButtonPressed:(id)sender { BOOL valid = FALSE; valid=[self validateEntry]; if(valid) { NSString *bytes = [NSString stringWithFormat:@"{\"UserName\":\"%@ %@\",\"Email\":\"%@\",\"UserType\":\"normaluser\",\"Password\":\"%@\"}",firstName,lastName,email,password]; NSURL *url=[NSURL URLWithString:urlstring]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; [request setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:[bytes dataUsingEncoding:NSUTF8StringEncoding]]; [self setUrlConnection:[NSURLConnection connectionWithRequest:request delegate:self]]; [self setResponseData:[NSMutableData data]]; [self.urlConnection start]; } } 

然后添加以下作为连接委托方法：

  - (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [self.responseData setLength:0]; } - (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.responseData appendData:data]; } - (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Network Status" message:@"Sorry,Network is not available. Please try again later." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alert show]; } - (void) connectionDidFinishLoading:(NSURLConnection *)connection { if (connection == self.urlConnection) { [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; NSError *error; NSDictionary *jsonString=[NSJSONSerialization JSONObjectWithData:self.responseData options:kNilOptions error:&error]; if(jsonString != nil) { if ([[[jsonString objectForKey:@"data"] objectForKey:@"id"] length]) { [[NSUserDefaults standardUserDefaults] setValue:[[jsonString objectForKey:@"data"] objectForKey:@"id"] forKey:@"user_id"]; [[NSUserDefaults standardUserDefaults] setValue:[[jsonString objectForKey:@"data"] objectForKey:@"UserName"] forKey:@"user_name"]; [[NSUserDefaults standardUserDefaults] synchronize]; [delegate userRegistrationViewControllerResponse:self]; } else { UIAlertView *alertView=[[UIAlertView alloc] initWithTitle:@"Info" message:[jsonString objectForKey:@"statusText"] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; [alertView show]; } } else { UIAlertView *alertView=[[UIAlertView alloc] initWithTitle:@"Server Busy" message:@"Register after sometime" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; [alertView show]; } } } 

• 这会将用户信息作为JSON发布。

Answer 2

试试这个…

  NSURL *aUrl = [NSURL URLWithString:@"https://www.website.com/_api/Login/"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:aUrl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:0.0]; [request setHTTPMethod:@"POST"]; NSString *postString = [NSString stringWithFormat:@"EmailAddress=%@&UserPassword=%@",uName.text,pwd.text]; [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]]; [[NSURLConnection alloc] initWithRequest:request delegate:self]; 

– 因为调用NSURLConnection委托方法..点忘了分配responseData ….

  - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; responseData = nil; json =[[responseString JSONValue] retain]; NSLog(@"Dict here: %@", json); } 

Answer 3

请求应该是沿着这些线的东西…

 NSURL * url = [NSURL URLWithString:@"your_url"]; NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url]; [request setHTTPMethod:@"POST"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; NSError * error = nil; NSData * postData = [NSJSONSerialization dataWithJSONObject:your_json_dictionary_here options:NSJSONReadingMutableContainers error:&error]; [request setHTTPBody:postData]; 

我也build议检查你的回应，找出你的请求失败的原因。 它在客户端还是服务器端（为什么？）…