ios 网络编程之iPhone中的网络请求

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:

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NSString *urlString = [NSString stringWithFormat:@"http://www.voland.com.cn:8080/weather/weatherServlet?city=%@",kcityID];
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest  requestWithURL:url];
NSURLConnection *aUrlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:true];
self.urlConnection = aUrlConnection;//这里的urlConnection在头文件中定义的变量
[self.urlConnection start];//开始连接网络
[aUrlConnection release];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

接收数据部分,接收到的数据主要是在这里处理

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- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response  {
NSLog(@"接收完响应:%@",response);
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data  {
NSLog(@"接收完数据:");
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error  {
NSLog(@"数据接收错误:%@",error);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection  {
NSLog(@"连接完成:%@",connection);
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}

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:

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NSString *content=[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
[request setHTTPBody: content];  
[request setHTTPMethod: @"POST"];  
[request setValue:@"Close" forHTTPHeaderField:@"Connection"];  
[request setValue:@"www.voland.com.cn" forHTTPHeaderField:@"Host"];  
[request setValue:[NSString stirngWithFormat@"%d",[content length]] forHTTPHeaderField:@"Content-Length"];
posted @ 2012-06-21 20:37  江海不系舟  阅读(294)  评论(0编辑  收藏  举报