1、GET请求

+ (NSData* )doHttpGet:(NSString* )url {
    NSURL*uri=[NSURLURLWithString:url];
    NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL: uri];
    [request setHTTPMethod: @"GET"];
    NSData* returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];
    return returnData;
}

2、Post请求1

+ (NSData* )doHttpPost:(NSString* )urlwithString: (NSString* )param {
    NSData*data=nil;
    if( param != nil && [param isEqualToString: @""] == NO) {
        param = [param stringByAddingPercentEscapesUsingEncoding: CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];
        data=[param dataUsingEncoding: CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];
    }
    return [self doHttpPost: url withParam: data];
}

+ (NSData* )doHttpPost:(NSString *)url withParam:(NSData *)param {
    // 新建请求
    NSURL*uri = [NSURL URLWithString: url];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: uri cachePolicy: NSURLRequestReloadIgnoringLocalCacheData timeoutInterval: 40.0];
    // 设置请求参数
    [request setHTTPMethod: @"POST"];
    [request addValue: @"application/x-www-form-urlencoded" forHTTPHeaderField: @"Content-Type"];
    if(param!=nil)
        [request setHTTPBody: param];
    // 开发访问网络的状态提示
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: YES];
    // 请求连接
    NSError *error = nil;
    NSData *retData = [NSURLConnection sendSynchronousRequest: requestreturningResponse: nil error: nil];
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: NO]; 
    // 返回结果
    return retData;

希望对你有帮助！