如何使用 NSURLRequest 在 Http 请求中发送 json 数据

发布于12月17日

我是Objective-c的新手，从最近开始，我开始在请求/响应方面投入大量精力.我有一个可以工作的示例，它可以调用URL(通过http get)并解析返回的json.

下面是这方面的工作示例

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [responseData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [responseData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
  NSLog([NSString stringWithFormat:@"Connection failed: %@", [error description]]);
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    [connection release];
  //do something with the json that comes back ... (the fun part)
}

- (void)viewDidLoad
{
  [self searchForStuff:@"iPhone"];
}

-(void)searchForStuff:(NSString *)text
{
  responseData = [[NSMutableData data] retain];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.whatever.com/json"]];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

My first question is - will this approach scale up? Or is this not async (meaning I block the UI thread while the app is waiting for the response)

我的第二个问题是-如何修改请求部分来执行POST而不是GET？是否简单地像这样修改HttpMethod？

[request setHTTPMethod:@"POST"];

And finally - how do I add a set of json data to this post as a simple string (for example)

{
    "magic":{
               "real":true
            },
    "options":{
               "happy":true,
                "joy":true,
                "joy2":true
              },
    "key":"123"
}

提前谢谢

NSArray *objects = [NSArray arrayWithObjects:[[NSUserDefaults standardUserDefaults]valueForKey:@"StoreNickName"], [[UIDevice currentDevice] uniqueIdentifier], [dict objectForKey:@"user_question"], nil]; NSArray *keys = [NSArray arrayWithObjects:@"nick_name", @"UDID", @"user_question", nil]; NSDictionary *questionDict = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; NSDictionary *jsonDict = [NSDictionary dictionaryWithObject:questionDict forKey:@"question"]; NSString *jsonRequest = [jsonDict JSONRepresentation]; NSLog(@"jsonRequest is %@", jsonRequest); NSURL *url = [NSURL URLWithString:@"https://xxxxxxx.com/questions"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSData *requestData = [jsonRequest 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]; if (connection) { receivedData = [[NSMutableData data] retain]; }

NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSDictionary *jsonDict = [jsonString JSONValue]; NSDictionary *question = [jsonDict objectForKey:@"question"];

如何使用 NSURLRequest 在 Http 请求中发送 json 数据

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