objective-c - RestKit 图片上传

Question

我正在使用 RestKit 驱动与我的网络服务器的交互。我正在尝试使用路由将事件对象 POST 到服务器，并附有图像。代码如下:

  RKObjectManager *manager = [RKObjectManager sharedManager];

  RKObjectMapping *map = [self eventMapping];
  manager.serializationMIMEType = RKMIMETypeFormURLEncoded;
  map.rootKeyPath = @"event";
  [manager.mappingProvider setSerializationMapping:map forClass:[Event class]];
  [manager.router routeClass:[Event class] toResourcePath:@"/v1/events.json" forMethod:RKRequestMethodPOST];

  [manager postObject:event delegate:self block:^(RKObjectLoader *loader){
    RKObjectMapping *serMap = [[[RKObjectManager sharedManager] mappingProvider] serializationMappingForClass:[Event class]];
    NSError *error = nil;
    NSDictionary *d = [[RKObjectSerializer serializerWithObject:event mapping:serMap] serializedObject:&error];

    RKParams *p = [RKParams paramsWithDictionary:d];
    [p setData:[event imageData] MIMEType:@"image/jpeg" forParam:@"image"];
    loader.params = p;
  }];

如果我使用序列化的 Event 对象创建 RKParams 的实例，然后添加图像数据并将其指定为 RKObjectLoader 的 params 属性，所有属性将成为一个巨大的序列化字符串。必须有一种方法可以在不进行大量字符串序列化的情况下上传图像。

我也尝试过将 NSData 属性映射到某个属性，一路将 UIImage 转换为 NSData，但 RestKit 提示它无法映射。以前有人这样做过吗？

Answer 1

我做了一些非常相似的事情，结果很好。我知道你的问题是关于为什么 RKObjectSerializer 没有按你期望的方式工作，但也许它与你的设置有关。我正在发布我的代码，以提供一个有效的示例。也就是说，在阅读 RKObjectSerializer 文档后，我不明白为什么你不能以这种方式初始化 RKParams 而不是像我在我的示例中那样直接设置它们。

路由器设置:

RKObjectManager *objectManager = [RKObjectManager objectManagerWithBaseURL:kApiUrlBase];
[objectManager.router routeClass:[PAPetPhoto class] toResourcePath:@"/pet/uploadPhoto" forMethod:RKRequestMethodPOST];

映射设置:

RKObjectMapping *papetPhotoMapping = [RKObjectMapping mappingForClass:[PAPetPhoto class]];
[papetPhotoMapping mapKeyPath:@"id" toAttribute:@"identifier"];
[papetPhotoMapping mapAttributes:@"accountId", @"petId", @"photoId", @"filename", @"contentType", nil];
[objectManager.mappingProvider addObjectMapping:papetPhotoMapping];
[objectManager.mappingProvider setSerializationMapping:[papetPhotoMapping inverseMapping] forClass:[PAPetPhoto class]];
[objectManager.mappingProvider setMapping:papetPhotoMapping forKeyPath:@"petPhoto"];

帖子:(请注意，因为我在 block 中构建了所有参数，所以我的对象只是一个虚拟实例，用于触发正确的路由和映射器)。

    PAPetPhoto *photo = [[PAPetPhoto alloc] init];
    [[RKObjectManager sharedManager] postObject:photo delegate:self block:^(RKObjectLoader *loader){

        RKParams* params = [RKParams params];
        [params setValue:pet.accountId forParam:@"accountId"];
        [params setValue:pet.identifier forParam:@"petId"];
        [params setValue:_photoId forParam:@"photoId"];
        [params setValue:_isThumb ? @"THUMB" : @"FULL" forParam:@"photoSize"];
        [params setData:data MIMEType:@"image/png" forParam:@"image"];

        loader.params = params;
    }];

服务器端点(Java、Spring MVC)

    @RequestMapping(value = "/uploadPhoto", method = RequestMethod.POST)
    @ResponseBody
    public Map<String, Object> handleFormUpload(@RequestParam("accountId") String accountId,
                                    @RequestParam("petId") String petId,
                                    @RequestParam("photoId") String photoId,
                                    @RequestParam("photoSize") PhotoSizeEnum photoSize,
                                    @RequestParam("image") Part image) throws IOException {

        if (log.isTraceEnabled()) 
            log.trace("uploadPhoto. accountId=" + accountId + " petId=" + petId + " photoId=" + photoId + " photoSize=" + photoSize);

        PetPhoto petPhoto = petDao.savePetPhoto(accountId, petId, photoId, photoSize, image);

        Map<String, Object> map = GsonUtils.wrapWithKeypath(petPhoto, "petPhoto");
        return map;
    }

服务器响应 JSON(注意与映射设置对应的“petPhoto”的 keyPath):

{
    petPhoto =     {
        accountId = 4ebee3469ae2d8adf983c561;
        contentType = "image/png";
        filename = "4ebee3469ae2d8adf983c561_4ec0983d036463d900841f09_3FED4959-1042-4D8B-91A8-76AA873851A3";
        id = 4ee2e80203646ecd096d5201;
        petId = 4ec0983d036463d900841f09;
        photoId = "3FED4959-1042-4D8B-91A8-76AA873851A3";
    };
}

委托(delegate):

- (void) objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object {

    if ([objectLoader wasSentToResourcePath:@"/pet/uploadPhoto"]) {
       PAPetPhoto *photo = (PAPetPhoto*)object;
    }
}