iOS原生網路請求
阿新 • • 發佈:2019-01-29
1、 同步GET請求 //第一步,建立URL NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do?type=focus-c"]; //第二步,通過URL建立網路請求 NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10]; //NSURLRequest初始化方法第一個引數:請求訪問路徑,第二個引數:快取協議,第三個引數:網路請求超時時間(秒) 其中快取協議是個列舉型別包含: NSURLRequestUseProtocolCachePolicy(基礎策略) NSURLRequestReloadIgnoringLocalCacheData(忽略本地快取) NSURLRequestReturnCacheDataElseLoad(首先使用快取,如果沒有本地快取,才從原地址下載) NSURLRequestReturnCacheDataDontLoad(使用本地快取,從不下載,如果本地沒有快取,則請求失敗,此策略多用於離線操作) NSURLRequestReloadIgnoringLocalAndRemoteCacheData(無視任何快取策略,無論是本地的還是遠端的,總是從原地址重新下載) NSURLRequestReloadRevalidatingCacheData(如果本地快取是有效的則不下載,其他任何情況都從原地址重新下載) //第三步,連線伺服器 NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *str = [[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding]; NSLog(@"%@",str); 2、同步POST請求 //第一步,建立URL NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"]; //第二步,建立請求 NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10]; [request setHTTPMethod:@"POST"];//設定請求方式為POST,預設為GET NSString *str = @"type=focus-c";//設定引數 NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; [request setHTTPBody:data]; //第三步,連線伺服器 NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *str1 = [[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding]; NSLog(@"%@",str1); 3、非同步GET請求 //第一步,建立url NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do?type=focus-c"]; //第二步,建立請求 NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10]; //第三步,連線伺服器 NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 4、非同步POST請求 //第一步,建立url NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"]; //第二步,建立請求 NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10]; [request setHTTPMethod:@"POST"]; NSString *str = @"type=focus-c"; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; [request setHTTPBody:data]; //第三步,連線伺服器 NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 5、非同步請求的代理方法 //接收到伺服器迴應的時候呼叫此方法 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { NSHTTPURLResponse *res = (NSHTTPURLResponse *)response; NSLog(@"%@",[res allHeaderFields]); self.receiveData = [NSMutableData data]; } //接收到伺服器傳輸資料的時候呼叫,此方法根據資料大小執行若干次 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.receiveData appendData:data]; } //資料傳完之後呼叫此方法 -(void)connectionDidFinishLoading:(NSURLConnection *)connection { NSString *receiveStr = [[NSString alloc]initWithData:self.receiveData encoding:NSUTF8StringEncoding]; NSLog(@"%@",receiveStr); } //網路請求過程中,出現任何錯誤(斷網,連線超時等)會進入此方法 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"%@",[error localizedDescription]); }