#pragma mark -同步GET請求

- (IBAction)synGet:(id)sender

{

??? //第一步，創建URL

??? NSURL *url=[[NSURL alloc]initWithString:@"http://www.weather.com.cn/data/sk/101010100.html"];

??? //第二步，通過URL創建網絡請求

??? NSURLRequest *request=[[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60];

??? //NSURLRequest初始化方法第一個參數：請求訪問路徑，第二個參數：緩存協議，第三個參數：網絡請求超時時間（秒）

//??? 其中緩存協議是個枚舉類型包含：

//??? NSURLRequestUseProtocolCachePolicy（基礎策略）

//??? NSURLRequestReloadIgnoringLocalCacheData（忽略本地緩存）

//??? NSURLRequestReturnCacheDataElseLoad（首先使用緩存，如果沒有本地緩存，才從原地址下載）

//??? NSURLRequestReturnCacheDataDontLoad（使用本地緩存，從不下載，如果本地沒有緩存，則請求失敗，此策略多用于離線操作）

//??? NSURLRequestReloadIgnoringLocalAndRemoteCacheData（無視任何緩存策略，無論是本地的還是遠程的，總是從原地址重新下載）

//??? NSURLRequestReloadRevalidatingCacheData（如果本地緩存是有效的則不下載，其他任何情況都從原地址重新下載）

???

??? //第三步，連接服務器

??? NSURLResponse *response=nil;

??? NSError *error=nil;

??? NSData *received=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

??? NSString *str=[[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding];

??? NSLog(@"%@",str);

}

#pragma mark -同步POST請求

- (IBAction)synPost:(id)sender

{

??? NSURL *url=[NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"];

??? NSMutableURLRequest *request=[[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

??? [request setHTTPMethod:@"POST"];//設置請求方式為POST，默認為GET

??? NSString *str=@"type=focus-c";//設置參數

??? NSData *data=[str dataUsingEncoding:NSUTF8StringEncoding];

??? [request setHTTPBody:data];

??? NSData *received=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

??? NSString *str1=[[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding];

??? NSLog(@"%@",str1);

}

//異步GET請求

-(void)a{

??? NSURL *url=[NSURL URLWithString:@"http://api.hudong.com/iphonexml.do?type=focus-c"];

??? NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

??? NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];

}

//異步POST請求

-(void)b{

??? NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"];

??? 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];

??? NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];

}

//異步請求的代理方法

//接收到服務器回應的時候調用此方法

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

??? NSHTTPURLResponse *res = (NSHTTPURLResponse *)response;

??? NSLog(@"%@",[res allHeaderFields]);

??? self.receiveData = [NSMutableData data];

}

//接收到服務器傳輸數據的時候調用，此方法根據數據大小執行若干次

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

??? self.receiveData appendData:data];

}

//數據傳完之后調用此方法

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

{

??? NSString *receiveStr = [[NSString alloc]initWithData:self.receiveData encoding:NSUTF8StringEncoding];

??? NSLog(@"%@",receiveStr);

}

//網絡請求過程中，出現任何錯誤（斷網，連接超時等）會進入此方法

-(void)connection:(NSURLConnection *)connection

didFailWithError:(NSError *)error

{

??? NSLog(@"%@",[error localizedDescription]);

}

?

轉載于:https://www.cnblogs.com/ioschen/p/3290510.html

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