POST

    

   NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];request.HTTPMethod = @"POST";

　　// 请求参数NSString *bodyStr = [NSString stringWithFormat:@"username=%@&password=%@", username, password];request.HTTPBody = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];NSData *data =[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    NSError *error = nil;NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];NSLog(@"---------------%@", json);