iOS--网络请求

 // 1.GET请求方式，访问或者请求网络资源

    // 准备字符串网址

    NSString *urlString = @"http://api.hudong.com/iphonexml.do?type=focus-c";

    // 把字符串对象转为URL对象

    NSURL *url = [NSURL URLWithString:urlString];

    // 根据url生成request

    NSMutableURLRequest *mutableRequest = [NSMutableURLRequest requestWithURL:urlcachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30];

    // 默认的请求方式是GET，我们可以主动设置请求的方式

    [mutableRequest setHTTPMethod:@"GET"];

    // 通过同步请求，获取指定网络地址的数据

    NSData *receiverData = [NSURLConnection sendSynchronousRequest:mutableRequestreturningResponse:nil error:nil];

    // 把获取到的NSData数据转为字符串

    NSString *dataString = [[NSString alloc] initWithData:receiverDataencoding:NSUTF8StringEncoding];

    // 打印获取到的文本信息

    NSLog(@"%@", dataString);

    [dataString release], dataString = nil;

// 

// 2.POST请求

    // 准备字符串网址

    NSString *urlString = @"http://api.hudong.com/iphonexml.do?";

    // 把字符串网址转为NSURL对象

    NSURL *url = [NSURL URLWithString:urlString];

    // 使用url获得Request

    NSMutableURLRequest *mutableRequest = [NSMutableURLRequest requestWithURL:urlcachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30];

    // 设置为POST请求

    [mutableRequest setHTTPMethod:@"POST"];

    // 设置post请求的数据包

    [mutableRequest setHTTPBody:[@"type=focus-c"dataUsingEncoding:NSUTF8StringEncoding]];

    // 建立同步请求，并访问数据

    NSData *receiverData = [NSURLConnection sendSynchronousRequest:mutableRequestreturningResponse:nil error:nil];

    NSLog(@"%@", [[NSString alloc] initWithData:receiverDataencoding:NSUTF8StringEncoding]);