ios - Jsonobject + 图像多部分 AFNetworking

Question

我们正在尝试使用 AFNetworking 向服务器发送多部分请求。我们需要发送一个 json 对象和两个图像文件。以下是相同的 curl 请求。

curl -X POST http://localhost:8080/Circle/restapi/offer/add -H "Content-Type: multipart/form-data"-F "offerDTO={"code": null, "name": "Merry X'Mas - 1","re​​mark": "25% discount on every purchase","validityDate": "22-12-2014","domainCode": "DO - 1","merchantCode ": "M-4","isApproved": false,"discountValue": 25,"discountType": "PERCENTAGE"};type=application/json"-F "image=@Team Page.png;type=image/png"-F "letterhead=@Team Page.png;type=image/png"

我知道这应该相当容易，因为我已经实现了服务器以及相同的 android 代码。我的 friend 正在研究其中的 iOS 部分。我也在谷歌上搜索了很多，但没有得到任何有用的东西。所以，我知道它违反了 StackOverflow 的规则，但是你们能给我使用 AfNetworking 的相同代码吗？如果没有，请将我重定向到同一行的示例。

编辑:请找到我们尝试过的以下代码:

UIImage *imageToPost = [UIImage imageNamed:@"1.png"];
NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0);

offerDTO = [[NSMutableDictionary alloc]init];
[offerDTO setObject(angry)"" forKey:@"code"];
[offerDTO setObject:[NSString stringWithFormat:@"Testing"] forKey:@"discountDiscription"];
[offerDTO setObject:[NSString stringWithFormat:@"Test"] forKey:@"remark"];
[offerDTO setObject:@"07-05-2015" forKey:@"validityDate"];
[offerDTO setObject:@"C-7" forKey:@"creatorCode"];
[offerDTO setObject:@"M-1" forKey:@"merchantCode"];
[offerDTO setObject:[NSNumber numberWithBool:true] forKey:@"isApproved"];
[offerDTO setObject:@"2.4" forKey:@"discountValue"];
[offerDTO setObject:[NSString stringWithFormat:@"FREE"] forKey:@"discountType"];

NSURL *urlsss = [NSURL URLWithString:@"http://serverurl:8180"];
AFHTTPClient *client= [AFHTTPClient clientWithBaseURL:urlsss];
NSMutableURLRequest *request = [client multipartFormRequestWithMethod:@"POST" 
                                    path:@"/restapi/offer/add" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData)
                                    {
                                        NSData *myData = [NSJSONSerialization dataWithJSONObject:offerDTO
                                                            options:NSJSONWritingPrettyPrinted
                                                            error:NULL];

                                        [formData appendPartWithFileData:imageData name:@"image"
                                                            fileName:@"image.jpg" 
                                                            mimeType:@"image/jpeg"];

                                        [formData appendPartWithFileData:imageData name:@"letterhead"
                                                            fileName:@"image.jpg" 
                                                            mimeType:@"image/jpeg"];

                                        [formData appendPartWithFormData:myData name:@"offerDTO"];
                                    }
                                ];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
    {
        NSDictionary *jsons = [NSJSONSerialization JSONObjectWithData:responseObject options:kNilOptions error:nil];     
    }
     failure:^(AFHTTPRequestOperation operation, NSError error)
    {    
        NSLog(@"error: %@", [operation error]);

    }
];

Answer 1

一些观察:

1. 您的示例是 AFNetworking 1.x。 AFNetworking 3.x 再现可能如下所示:

   NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"1" withExtension:@"png"];
   
   // If you need to build dictionary dynamically as in your question, that's fine,
   // but sometimes array literals are more concise way if the structure of
   // the dictionary is always the same.
   
   // Also note that these keys do _not_ match what are present in the `curl`
   // so please double check these keys (e.g. `discountDiscription` vs
   // `discountDescription` vs `name`)!
   
   NSDictionary *offerDTO = @{@"code"                : @"",
                              @"discountDescription" : @"Testing",
                              @"remark"              : @"Test",
                              @"validityDate"        : @"07-05-2015",
                              @"creatorCode"         : @"C-7",
                              @"merchantCode"        : @"M-1",
                              @"isApproved"          : @YES,
                              @"discountValue"       : @2.4,
                              @"discountType"        : @"FREE"};
   
   // `AFHTTPSessionManager` is AFNetworking 3.x equivalent to `AFHTTPClient` in AFNetworking 1.x
   
   NSURL *baseURL = [NSURL URLWithString:@"http://serverurl:8180"];
   AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithBaseURL:baseURL];
   
   // The `POST` method both creates and issues the request
   
   [manager POST:@"/restapi/offer/add" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
       NSError *error;
       BOOL success;
   
       success = [formData appendPartWithFileURL:fileURL
                                            name:@"image"
                                        fileName:@"image.jpg"
                                        mimeType:@"image/png"
                                           error:&error];
       NSAssert(success, @"Failure adding file: %@", error);
   
       success = [formData appendPartWithFileURL:fileURL
                                            name:@"letterhead"
                                        fileName:@"image.jpg"
                                        mimeType:@"image/png"
                                           error:&error];
       NSAssert(success, @"Failure adding file: %@", error);
   
       NSData *jsonData = [NSJSONSerialization dataWithJSONObject:offerDTO options:0 error:&error];
       NSAssert(jsonData, @"Failure building JSON: %@", error);
   
       // You could just do:
       //
       // [formData appendPartWithFormData:jsonData name:@"offerDTO"];
       //
       // but I now notice that in your `curl`, you set the `Content-Type` for the
       // part, so if you want to do that, you could do it like so:
   
       NSDictionary *jsonHeaders = @{@"Content-Disposition" : @"form-data; name=\"offerDTO\"",
                                     @"Content-Type"        : @"application/json"};
       [formData appendPartWithHeaders:jsonHeaders body:jsonData];
   } progress:^(NSProgress * _Nonnull uploadProgress) {
       // do whatever you want here
   } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
       NSLog(@"responseObject = %@", responseObject);
   } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
       NSLog(@"error = %@", error);
   }];
   

2. 您正在此处创建一个操作，但从未将其添加到队列中以启动它。我假设你在其他地方这样做。值得注意的是，AFHTTPSessionManager 不支持像已弃用的 AFHTTPRequestOperationManager 或 AFHTTPClient 那样的操作。上面的代码只是自动开始运行。

3. 请注意，AFNetworking 现在假定响应将是 JSON。鉴于您的代码表明响应是 JSON，请注意不需要 JSONObjectWithData，因为已经为您完成了。

4. 现在您的代码是 (a) 创建 UIImage； (b) 将其转换回 NSData； (c) 将其添加到 formData。由于多种原因，这是低效的:

   • 具体来说，通过获取图像资源，将其加载到 UIImage 中，然后使用 UIImageJPEGRepresentation，您可能会生成 NSData 比原始 Assets 大得多。您可能会考虑只获取原始 Assets ，完全绕过 UIImage 并发送它(显然，如果您要发送 PNG，那么也要更改 mime 类型)。

   • 将 NSData 添加到请求的过程可能会导致更大的内存占用。通常，如果您提供一个文件名，它可以将峰值内存使用量保持在较低水平。