RestKit图片上传 [英] RestKit Image Upload

问题描述

我正在使用RestKit来推动与我的网络服务器的互动。我正在尝试使用路由将一个Event对象POST到服务器并附加一个映像。代码如下：

I am using RestKit to drive interactions with my web server. I am trying to use routing to POST an Event object to the server with an image attached to it. The code is as follows:

  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实例，则添加图像数据并分配它作为RKObjectLoader的params属性，所有属性都成为一个大规模的序列化字符串。必须有一种方法来上传没有大量字符串序列化的图像。

If I create an instance of RKParams using the serialized Event object, then add the image data and assign it as the RKObjectLoader's params property, all the properties become one massive serialized string. There must be a way to upload an image without the massive string serialization.

我也尝试过将NSData属性映射到某个属性，将UIImage转换为NSData一路上，但RestKit抱怨它无法映射。有人曾经这样做过吗？

I have also tried having an NSData property that is mapped to some attribute, converting a UIImage into NSData along the way, but RestKit complains that it can't be mapped. Has anyone done this before?

推荐答案

我做了一些非常相似的事情，结果很好。我意识到你的问题是为什么RKObjectSerializer没有按照你期望的方式工作，但也许它与你的设置有关。我发布了我的代码，以提供一个有效的东西的清晰示例。也就是说，在阅读了RKObjectSerializer文档后，我不明白为什么你不能像我在我的例子中那样直接初始化你的RKParams。

I did something very similar and it worked out just fine. I realize your question is about why RKObjectSerializer isn't working the way you expect, but maybe it is something else with your setup. I'm posting my code to give a clean example of something that does work. That said, after reading the RKObjectSerializer documentation, I don't see why you couldn't initialize your RKParams that way instead of setting them directly as I do in my example.

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：（注意事项，因为我建立了我的所有参数阻止我的对象只是一个虚拟实例来触发正确的路由和映射器。）

The post: (notice since I built up all my params in the block my object is just a dummy instance to trigger the proper routing and mapper).

    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）

Server endpoint (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 （请注意的keyPath petPhoto对应于映射设置：

Server response JSON (note the keyPath of "petPhoto" that corresponds to the mapping setup):

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

代表：

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

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

这篇关于RestKit图片上传的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！