iOS http 学习

简单的http demo - (IBAction)get_btn_touch_up_inside:(id)sender { //K1+车次+K2 NSString *url=[K1 stringByAppendingString:self.m_trainName.text]; url=[url stringByAppendingString:K2]; NSURL *urlRquest=[NSURL URLWithString:k4]; NSURLRequest *request=[NSURLRequest requestWithURL:urlRquest]; NSLog(@"get_begin");//开始get的方法发送数据最好写成GCD的方式 NSURLResponse *response=nil;//获取服务器的响应返回 NSError *error=nil;//获取错误的信息 NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];//等到了要刷新界面 NSHTTPURLResponse *httpResponse=(NSHTTPURLResponse*)response; NSString *str=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]; NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil]; NSLog(@"%@",str); } //post方法 - (IBAction)post_btn_touch_up_inside:(id)sender { NSString *strTrainCode=self.m_trainName.text;//获取火车车次代码 NSString *strUserId=@"";//用户id,不需要赋值 NSString *strURL=k4;//请求的URL地址 NSString *strBody=[NSString stringWithFormat:@"TrainCode=%@&UserIDR=%@",strTrainCode,strUserId];//表示后面 NSString *length=[NSString stringWithFormat:@"%d",[strBody length]]; NSMutableURLRequest *request=[[NSMutableURLRequest alloc]init];//客户端向服务端请求的类 [request setURL:[NSURL URLWithString:strURL]];//设置http地址 [request setHTTPMethod:@"POST"];//设置发送方法 [request setTimeoutInterval:10];//设置连接超时，默认240秒 [request setValue:length forHTTPHeaderField:@"Content-Length"];//设置数据长度 [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Contene-Type"];//设置数据格式 [request setHTTPBody:[strBody dataUsingEncoding:NSUTF8StringEncoding]];//设置携带的消息体，准备请求 NSURLResponse *response=nil;//获取服务器的响应返回 NSError *error=nil;//获取错误的信息 NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];//等到了要刷新界面 NSHTTPURLResponse *httpResponse=(NSHTTPURLResponse*)response; NSString *str=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"%@",str); self.m_textView.text=str; }