RestKit 图片上传
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【中文标题】RestKit 图片上传【英文标题】:RestKit Image Upload 【发布时间】:2012-01-16 07:31:15 【问题描述】:我正在使用 RestKit 来驱动与我的 Web 服务器的交互。我正在尝试使用路由将事件对象发布到服务器,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分配为 RKObjectLoader 的 params 属性,则所有属性都成为一个庞大的序列化字符串。必须有一种方法可以在没有大量字符串序列化的情况下上传图片。
我也尝试过拥有一个映射到某个属性的 NSData 属性,一路将 UIImage 转换为 NSData,但 RestKit 抱怨它无法映射。以前有人做过吗?
【问题讨论】:
【参考方案1】:我做了一些非常相似的事情,结果很好。我意识到您的问题是关于为什么 RKObjectSerializer 没有按您期望的方式工作,但也许它与您的设置有关。我发布我的代码是为了给出一个有效的例子。也就是说,在阅读了 RKObjectSerializer 文档之后,我不明白为什么不能像我在示例中那样直接设置 RKParams 而是以这种方式初始化它们。
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,由于我在块中构建了所有参数,因此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";
;
代表:
- (void) objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object
if ([objectLoader wasSentToResourcePath:@"/pet/uploadPhoto"])
PAPetPhoto *photo = (PAPetPhoto*)object;
【讨论】:
完美运行!只是一个侧面说明:试图通过设置 RKObjectMapping 的 rootKeyPath 属性将所有内容都限定为“事件”似乎不再起作用了。 这在 ios 6 中有效吗?我不断收到“RestKit 被要求重新传输请求的新正文流。可能的连接错误或身份验证挑战?”以上是关于RestKit 图片上传的主要内容,如果未能解决你的问题,请参考以下文章