Objective C, post 请求

-(void)postData

{

NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.abc.com"]];

[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];

[request setValue:@"application/json" forHTTPHeaderField:@"Content-type"];

request.HTTPMethod = @"POST";

NSString* requestBodyString = @"{\"key1\":\"value1\", \"key2\":\"value2\"}";

NSData* data = [requestBodyString dataUsingEncoding:NSUTF8StringEncoding];

request.HTTPBody = data;

NSOperationQueue* backgroundQueue = [[NSOperationQueue alloc]init];

[NSURLConnection sendAsynchronousRequest:request queue:backgroundQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

if (connectionError) {

NSLog(@"post data request error!");

}

}];

}