用iOS发送JSON请求

我遇到了一个问题，当我试图发送与iOS应用程序的JSON请求。 我必须发送这样的东西：

http://url/User/Create/{"newsletter" : 1,"password" : "sdsd", ...} 

但是在应用上执行此操作时，请求无效：

  NSURL *url = [NSURL URLWithString:@"http://url/User/Create/"]; NSData *jsonData; NSDictionary *dic = @{ @"login" : @"sdsd", @"password" : @"sdsd", @"newsletter" : @1, @"firstname" : @"sdsd", @"lastname" : @"sdsd", @"email" : @"[e-mail]"}; jsonData = [NSJSONSerialization dataWithJSONObject:dic options:0 error:&error]; 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]; 

我怎样才能以有效的格式发送请求？

Answer 1

 -(void)tryThis { NSString *a=@"{'login' : 'sdsd', 'password' : 'sdsd', 'newsletter' : 1, 'firstname' : 'sdsd', 'lastname' : 'sdsd', 'email' : '[e-mail]'}"; a= [a stringByReplacingOccurrencesOfString:@"'" withString:@"\"" options:NSCaseInsensitiveSearch range:NSMakeRange (0, [a length])]; NSData* postData= [a dataUsingEncoding:NSUTF8StringEncoding]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https:***********your url"]]; [request setHTTPMethod:@"POST"]; [request setValue:[NSString stringWithFormat:@"%d", postData.length] forHTTPHeaderField:@"Content-Length"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:postData]; NSURLResponse *response = NULL; NSError *requestError = NULL; NSData *responseData1 = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&requestError]; NSString *responseString = [[NSString alloc] initWithData:responseData1 encoding:NSUTF8StringEncoding]; } 

Answer 2

HttpRequestSenderDelegate.h

 @protocol HttpRequestSenderDelegate <NSObject> -(void) didFinishLoading:(BOOL)success data:(NSData*)data; @end 

HttpPostRequestSender.h

 @protocol HttpRequestSenderDelegate; @interface HttpPostRequestSender : NSObject - (id)initWithDelegate:(id<HttpRequestSenderDelegate>) delegate; - (void)send:(NSString*)url postParams:(NSString*)postParams; - (void)cancelDownload; @end 

HttpPostRequestSender.m

 #import "HttpPostRequestSender.h" #import "HttpRequestSenderDelegate.h" @interface HttpPostRequestSender () @property (nonatomic, weak) id<HttpRequestSenderDelegate> delegate; @property (nonatomic, strong) NSMutableData *activeDownload; @property (nonatomic, strong) NSURLConnection *dataConnection; @end @implementation HttpPostRequestSender @synthesize delegate = _delegate, activeDownload = _activeDownload, dataConnection = _dataConnection; - (id)initWithDelegate:(id<HttpRequestSenderDelegate>) delegate { self = [super init]; if (self) { self.delegate = delegate; } return self; } - (void)cancelDownload { [self.dataConnection cancel]; self.dataConnection = nil; self.activeDownload = nil; } - (void)send:(NSString*)url postParams:(NSString*)postParams { NSURL *nsurl = [NSURL URLWithString:url]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:nsurl cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; [request setHTTPMethod:@"POST"]; [request setHTTPBody:[postParams dataUsingEncoding:NSUTF8StringEncoding]]; NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]; self.dataConnection = conn; } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { self.activeDownload = [[NSMutableData alloc] init]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.activeDownload appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [self.delegate didFinishLoading:YES data:self.activeDownload]; self.dataConnection = nil; self.activeDownload = nil; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"The download could not complete - please make sure you're connected to either 3G or Wi-Fi." delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil]; [errorView show]; [self.delegate didFinishLoading:NO data:nil]; self.dataConnection = nil; self.activeDownload = nil; } @end 

在你的视图控制器中：MyViewController.h

 #import <UIKit/UIKit.h> #import "HttpRequestSenderDelegate.h" @interface MyViewController : UIViewController <HttpRequestSenderDelegate> @end 

MyViewController.m

  #import "MyViewController.h" #import "HttpPostRequestSender.h" @interface MyViewController () @property (nonatomic, strong) HttpPostRequestSender *requestSender; @end @implementation MyViewController @synthesize requestSender = _requestSender; -(HttpPostRequestSender*) requestSender { if(_requestSender == nil) _requestSender = [[HttpPostRequestSender alloc] initWithDelegate:self]; return _requestSender; } - (void)viewDidLoad { //for example i send the request in the view did load [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; NSString *url = @"your url"; //post params NSString *postParams =@"login=sdsd&password=sdsd&email=[e-mail]"; [self.requestSender send:url postParams:postParams]; } - (void) didFinishLoading:(BOOL)success data:(NSData *)data { [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; if(success && data != nil) { //here you can parse the response } } @end