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  • 同步和异步GET,POST请求

    #pragma mark -同步GET请求

    - (IBAction)synGet:(id)sender

    {

        //第一步,创建URL

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

        //第二步,通过URL创建网络请求

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

        //NSURLRequest初始化方法第一个参数:请求访问路径,第二个参数:缓存协议,第三个参数:网络请求超时时间(秒)

    //    其中缓存协议是个枚举类型包含:

    //    NSURLRequestUseProtocolCachePolicy(基础策略)

    //    NSURLRequestReloadIgnoringLocalCacheData(忽略本地缓存)

    //    NSURLRequestReturnCacheDataElseLoad(首先使用缓存,如果没有本地缓存,才从原地址下载)

    //    NSURLRequestReturnCacheDataDontLoad(使用本地缓存,从不下载,如果本地没有缓存,则请求失败,此策略多用于离线操作)

    //    NSURLRequestReloadIgnoringLocalAndRemoteCacheData(无视任何缓存策略,无论是本地的还是远程的,总是从原地址重新下载)

    //    NSURLRequestReloadRevalidatingCacheData(如果本地缓存是有效的则不下载,其他任何情况都从原地址重新下载)

       

        //第三步,连接服务器

        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请求

    - (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"];//设置请求方式为POST,默认为GET

        NSString *str=@"type=focus-c";//设置参数

        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);

    }

    //异步GET请求

    -(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];

    }

    //异步POST请求

    -(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];

    }

    //异步请求的代理方法

    //接收到服务器回应的时候调用此方法

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

    {

        NSHTTPURLResponse *res = (NSHTTPURLResponse *)response;

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

        self.receiveData = [NSMutableData data];

    }

    //接收到服务器传输数据的时候调用,此方法根据数据大小执行若干次

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

    {

        self.receiveData appendData:data];

    }

    //数据传完之后调用此方法

    -(void)connectionDidFinishLoading:(NSURLConnection *)connection

    {

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

        NSLog(@"%@",receiveStr);

    }

    //网络请求过程中,出现任何错误(断网,连接超时等)会进入此方法

    -(void)connection:(NSURLConnection *)connection

    didFailWithError:(NSError *)error

    {

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

    }

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  • 原文地址:https://www.cnblogs.com/ioschen/p/3290510.html
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