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IOS之同步请求、异步请求、GET请求、POST请求

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1、 同步GET请求

    //第一步,创建URL
    NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do?type=focus-c"];

    //第二步,通过URL创建网络请求
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
    //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
    NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

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

    NSLog(@"%@",str);

                                2、同步POST请求
    //第一步,创建URL
    NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"];
    //第二步,创建请求
    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];
    //第三步,连接服务器

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

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

    NSLog(@"%@",str1);

                                3、异步GET请求
    //第一步,创建url
    NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do?type=focus-c"];
    //第二步,创建请求
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
    //第三步,连接服务器
    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];

                                4、异步POST请求
    //第一步,创建url
    NSURL *url = [NSURL URLWithString:@"http://api.hudong.com/iphonexml.do"];
    //第二步,创建请求
    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,连接服务器
    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];

                                5、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]);
}

标签:异步请求,post,ios

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