ios 网络请求基础
一、简单的get请求
网络编程是我们经常遇到的,在IPhone中,SDK提供了良好的接口,主要使用的类有 NSURL,NSMutableURLRequest,NSURLConnection等等。一般情况下建议使用异步接收数据的方式来请求网络连接,这种网络连接分为两步,第一步是新建NSURLConnection对象后,直接调用它的start方法来连接网络。第二步是使用delegate方式来接收数据,这里给一个常用的写法:
网络请求部分:
1 NSString *urlString = [NSString stringWithFormat:@"http://www.voland.com.cn:8080/weather/weatherServlet?city=%@",kcityID]; 2 NSURL *url = [NSURL URLWithString:urlString]; 3 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 4 NSURLConnection *aUrlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:true]; 5 self.urlConnection = aUrlConnection;//这里的urlConnection在头文件中定义的变量 6 [self.urlConnection start];//开始连接网络 7 [aUrlConnection release]; 8 [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
接收数据部分,接收到的数据主要是在这里处理
1 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 2 NSLog(@"接收完响应:%@",response); 3 } 4 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 5 NSLog(@"接收完数据:"); 6 } 7 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 8 NSLog(@"数据接收错误:%@",error); 9 } 10 - (void)connectionDidFinishLoading:(NSURLConnection *)connection { 11 NSLog(@"连接完成:%@",connection); 12 [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; 13 }
二、Post请求
进行post请求,主要是设置好NSMutableURLRequest对象,在get请求中,我们都使用了默认的,实际这些request内容都可以设置的。设置好后,其它与get方式同:
1 NSString *content=[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; 2 [request setHTTPBody: content]; 3 [request setHTTPMethod: @"POST"]; 4 [request setValue:@"Close" forHTTPHeaderField:@"Connection"]; 5 [request setValue:@"www.voland.com.cn" forHTTPHeaderField:@"Host"]; 6 [request setValue:[NSString stirngWithFormat@"%d",[content length]] forHTTPHeaderField:@"Content-Length"];
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