MKN与AFN对比学习

叹落花 2015-07-31

展开全文

总结在前：
   1. MKN封装了GET和POST参数，直接用Dictionary对象传入即可；而AFN需要自己手动组装NSURLRequest对象
   2. MKN有超时设置；AFN在GET条件下设置的NSURLRequest能起作用，但在POST条件下不启用（原因是apple内部机制，固定为240s）
   3. MKN自带有线程池（wifi时最大数为6；wwan时最大数为2）；AFN需要自定义线程池
   4. 两者使用的方式基本一直，甚至连代码的行数都能一一对应。
   5. MKN更新进度时的BLOCK参数直接就是进度的百分比；而AFN是三个参数：当前交互数据量、已经交互累计数据量、总的需要交互的数据量，然后自己计算progress
   6. 都是采用异步操作方式，没有同步！（需要同步操作的话，只有采用最原始的NSURLConnection和NSString的静态下载方法）
   7. 都有JSON和XML解析专用方法；image异步下载专用方法
   8. AFN的AFHTTPClient相当于MKN的MKNetworkEngine，封装了一些简单方法，但没有MKN集成度高

AFN源码：https://github.com/AFNetworking/AFNetworking
AFNQA：https://github.com/AFNetworking/AFNetworking/wiki/AFNetworking-FAQ

一、MKN vs AFN 下载数据

    //-----------------------------
    //---------MKN下载数据----------
    //-----------------------------
    MKNetworkEngine *MKN = [[MKNetworkEngine alloc]  initWithHostName:nil customHeaderFields:nil];//自带了缓存策略；线程池(wifi最大6,wwan最大2)；freeze
    MKNetworkOperation *netOp= [MKN operationWithURLString:downLoadUrl params:nil httpMethod:@"GET"];//继承自NSOperation
    [netOp addDownloadStream:[NSOutputStream outputStreamToFileAtPath:@"test.pdf" append:NO]];//定义输出流
    //----------显示下载进度-------------------------------------------------------------------------
    MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];
    [self.view addSubview:HUD];
    HUD.tag=1000;
    HUD.mode = MBProgressHUDModeDeterminate;
    HUD.labelText = @"正在下载...";
    HUD.square = YES;
    [HUD show:YES];
    [netOp onDownloadProgressChanged:^(double progress) {HUD.progress = progress;}];//显示进度条
    //--------------------------------------------------------------------------------------------
    [netOp onCompletion:^(MKNetworkOperation* completedRequest) {[HUD removeFromSuperview];}//完成
                onError:^(NSError* error) {[HUD removeFromSuperview];}];
    [MKN enqueueOperation:netOp];//启动线程也可以用[netOp start]


    //-----------------------------
    //---------AFN下载数据----------
    //-----------------------------
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:pdfurl]];//封装下载对象(get，post数据等)
    //--------封装POST数据，键值对（GET访问就不需要）
    NSData *postData = [[postString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]dataUsingEncoding:NSUTF8StringEncoding];//将键值对（key=value&key=value）封装为NSData
    [request setHTTPMethod:@"POST"];
    [request setValue:[NSString stringWithFormat:@"%d",[postData length]] forHTTPHeaderField:@"Content-Length"];//设置NSData长度
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];//设置body
    //-----------------------------
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];////继承自NSOperation
    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:BillFile(pdfNameExt) append:NO];//定义输出流
    //----------显示下载进度-------------------------------------------------------------------------
    MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];
    [self.view addSubview:HUD];
    HUD.tag=1000;
    HUD.mode = MBProgressHUDModeDeterminate;
    HUD.labelText = @"正在下载...";
    HUD.square = YES;
    [HUD show:YES];
    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {//显示进度条
        HUD.progress = (totalBytesRead*1.0) / totalBytesExpectedToRead;}];
    //--------------------------------------------------------------------------------------------
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {[HUD removeFromSuperview];} //完成
                                     failure:^(AFHTTPRequestOperation *operation, NSError *error) {[HUD removeFromSuperview];}];
    [operation start];//这里可以自定义一个线程池NSOperationQueue，然后设置最大线程数，调用addOperation

二、MKN vs AFN 上传数据

    //-----------------------------
    //---------MKN上传数据----------
    //-----------------------------
    MKNetworkEngine *MKN = [[MKNetworkEngine alloc] initWithHostName:nil];
    MKNetworkOperation *netOp = [MKN operationWithURLString:uploadUrl params:[NSDictionary dictionaryWithObjectsAndKeys:AppSession.deviceId,@"deviceId",nil] httpMethod:@"POST"];
    [netOp addFile:BillFile(newBillName) forKey:@"image"];//添加文件 addFilePath:forFileName
    [netOp setFreezable:YES];//设置保持
    //----------显示上传进度-------------------------------------------------------------------------
    MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];
    [self.view addSubview:HUD];
    HUD.mode = MBProgressHUDModeDeterminate;
    HUD.labelText = @"正在上传...";
    HUD.square = YES;
    [HUD show:YES];
    [netOp onUploadProgressChanged:^(double progress) {HUD.progress = progress;}];//显示进度条
    //--------------------------------------------------------------------------------------------
    [netOp onCompletion:^(MKNetworkOperation* completedRequest) {[HUD removeFromSuperview];}//完成
                onError:^(NSError* error) {[HUD removeFromSuperview];}];
    [MKN enqueueOperation:netOp];//启动线程也可以用[netOp start]


    //-----------------------------
    //---------AFN上传数据（未测试）----------
    //-----------------------------
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:pdfurl]];//
    NSData *imageData = UIImagePNGRepresentation(image);//将图片文件转换为NSData（官方只给了图片上传方法，其它任何类型的文件上传有待测试）
    AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"192.168.1.106"]];
    NSMutableURLRequest *request = [client multipartFormRequestWithMethod:@"POST" path:@"/upload" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
                                   [formData appendPartWithFileData:imageData name:@"avatar" fileName:@"avatar.jpg" mimeType:@"image/jpeg"];}];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];////继承自NSOperation    
    //----------显示下载进度-------------------------------------------------------------------------
    MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];
    [self.view addSubview:HUD];
    HUD.tag=1000;
    HUD.mode = MBProgressHUDModeDeterminate;
    HUD.labelText = @"正在下载...";
    HUD.square = YES;
    [HUD show:YES];
    [operation setUploadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {//显示进度条
        HUD.progress = (totalBytesRead*1.0) / totalBytesExpectedToRead;}];
    //--------------------------------------------------------------------------------------------
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {[HUD removeFromSuperview];} //完成
                                     failure:^(AFHTTPRequestOperation *operation, NSError *error) {[HUD removeFromSuperview];}];
    [operation start];//这里可以自定义一个线程池NSOperationQueue，然后设置最大线程数，调用addOperation

三、多线程批量下载文件，没下载完成的后缀为.temp；采用线程池最大同时运行3个分线程；当下载完成时去掉后缀.temp，并删除临时文件

//函数作用: 多线程批量下载文件，没下载完成的后缀为.temp
//         采用线程池 最大同时运行3个分线程
//         当下载完成时去掉后缀.temp，并删除临时文件
//参数：array: 待下载的文件列表，每个文件的描述是NSDictionary，至少包括三个key——filename、filesize、filelink
//     path:  待下载文件保存的文件夹路径
//说明：该函数完成后，会发送线程同步消息；FileManager可以在这里（iOS开发知识体系——File Manager）找到源码

- (void)doDownloading:(NSMutableArray *)array toFolder:(NSString *)path{
    //---------------------------------过滤不需要下载的文件----------------------------------------------------
    NSMutableArray *arrayLocal = [FileManager allFilesAttributeInFolderPath:path];//获取本地目录下所有文件的filename和filesize信息
    for (NSDictionary *temp in arrayLocal) {//外循环是本地文件数组
        NSString *filename = [temp objectForKey:@"filename"];
        NSString *filesize = [temp objectForKey:@"filesize"];
        BOOL fileExists = NO;
        for (NSDictionary *temp1 in array) {//内循环是待下载的文件数组
            NSString *filename1 = [temp1 objectForKey:@"filename"];
            NSString *filesize1 = [temp1 objectForKey:@"filesize"];
            if ([filename1 isEqualToString:filename]) {
                fileExists = YES;
                if ([filesize isEqualToString:filesize1]) { //只要文件名和大小一致就表示没必要下载
                    [array removeObject:temp1];
                }
                break;
            }
        }
        //删除过时的文件
        if (!fileExists)[FileManager fileDelete:[path stringByAppendingPathComponent:filename]];
    }
    arrayLocal = nil;//释放内存
    //----------------------------------------------------------------------------------------------------- 
    
    //---------------------------------启动下载线程-----------------------------------------------------------
    if (array.count>0) {
        NSOperationQueue *queue = [[NSOperationQueue alloc] init];                              //线程池
        [queue setMaxConcurrentOperationCount:3];                                               //最大同时运行的线程数
        __block int arrayIndex = 0;                                                             //用于判断线程池里的线程是否都结束
        for (NSDictionary *dictTemp in array) {//遍历目标下载数组并启动下载
            NSString *filelink = [dictTemp objectForKey:@"filelink"];                           //文件的下载地址
            NSString *filename = [dictTemp objectForKey:@"filename"];                           //文件名
            NSString *filePath = [NSString stringWithFormat:@"%@/%@",path,filename];            //下载后保存文件的绝对路径
            NSString *filePathTemp = [NSString stringWithFormat:@"%@/%@.temp",path,filename];   //临时下载的文件路径
            AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:filelink]]];
            operation.outputStream = [NSOutputStream outputStreamToFileAtPath:filePathTemp append:NO];
            [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {if(![FileManager fileCopy:filePathTemp TargetName:filePath]){[FileManager fileDelete:filePath];}
                [FileManager fileDelete:filePathTemp];
                arrayIndex++;
                if (arrayIndex==array.count) {[condition signal];}//发送线程同步消息
            } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                [FileManager fileDelete:filePathTemp];
                arrayIndex++;
                if (arrayIndex==array.count) {[condition signal];}//发送线程同步消息
            }];
            [queue addOperation:operation];
        }
    }else{
        [condition signal];//发送线程同步消息
    }
    //-----------------------------------------------------------------------------------------------------
}