我正在使用 Spring 4.0.0.RELEASE、Spring Data Commons 1.7.0.M1、Spring Hateoas 0.8.0.RELEASE
我的资源是一个简单的 POJO:
public class UserResource extends ResourceSupport { ... }
我的资源组装器将 User 对象转换为 UserResource 对象:
@Component
public class UserResourceAssembler extends ResourceAssemblerSupport<User, UserResource> {
public UserResourceAssembler() {
super(UserController.class, UserResource.class);
}
@Override
public UserResource toResource(User entity) {
// map User to UserResource
}
}
在我的 UserController 中,我想Page<User>
从我的服务中检索,然后将其转换为PagedResources<UserResource>
using PagedResourcesAssembler
,如下所示:https ://stackoverflow.com/a/16794740/1321564
@RequestMapping(value="", method=RequestMethod.GET)
PagedResources<UserResource> get(@PageableDefault Pageable p, PagedResourcesAssembler assembler) {
Page<User> u = service.get(p)
return assembler.toResource(u);
}
这不会调用UserResourceAssembler
,只是User
返回的内容而不是我的 custom UserResource
。
返回单个资源有效:
@Autowired
UserResourceAssembler assembler;
@RequestMapping(value="{id}", method=RequestMethod.GET)
UserResource getById(@PathVariable ObjectId id) throws NotFoundException {
return assembler.toResource(service.getById(id));
}
PagedResourcesAssembler
需要一些通用参数,但是我不能使用T toResource(T)
,因为我不想将我的转换为Page<User>
,PagedResources<User>
特别是因为User
它是 POJO 并且没有资源。
所以问题是:它是如何工作的?
编辑:
我的 WebMvcConfigurationSupport:
@Configuration
@ComponentScan
@EnableHypermediaSupport
public class WebMvcConfig extends WebMvcConfigurationSupport {
@Override
protected void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
argumentResolvers.add(pageableResolver());
argumentResolvers.add(sortResolver());
argumentResolvers.add(pagedResourcesAssemblerArgumentResolver());
}
@Bean
public HateoasPageableHandlerMethodArgumentResolver pageableResolver() {
return new HateoasPageableHandlerMethodArgumentResolver(sortResolver());
}
@Bean
public HateoasSortHandlerMethodArgumentResolver sortResolver() {
return new HateoasSortHandlerMethodArgumentResolver();
}
@Bean
public PagedResourcesAssembler<?> pagedResourcesAssembler() {
return new PagedResourcesAssembler<Object>(pageableResolver(), null);
}
@Bean
public PagedResourcesAssemblerArgumentResolver pagedResourcesAssemblerArgumentResolver() {
return new PagedResourcesAssemblerArgumentResolver(pageableResolver(), null);
}
/* ... */
}
解决方案:
@Autowired
UserResourceAssembler assembler;
@RequestMapping(value="", method=RequestMethod.GET)
PagedResources<UserResource> get(@PageableDefault Pageable p, PagedResourcesAssembler pagedAssembler) {
Page<User> u = service.get(p)
return pagedAssembler.toResource(u, assembler);
}