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小编典典

实现Spring Data存储库的自定义方法并通过REST公开它们

spring

我正在尝试将自定义方法添加到我的Spring Data存储库中PersonRepository，如针对Spring Data存储库的1.3自定义实现中所述，并通过REST公开这些方法。初始代码来自使用REST示例访问JPA数据，这是添加/修改的类的代码：

interface PersonRepositoryCustom {
  List<Person> findByFistName(String name);
}

class PersonRepositoryImpl implements PersonRepositoryCustom, InitializingBean {
  @Override
  public void afterPropertiesSet() throws Exception {
    // initialization here
  }
  @Override
  public List<Person> findByFistName(String name) {
    // find the list of persons with the given firstname
  }
}

@RepositoryRestResource(collectionResourceRel = "people", path = "people")
public interface PersonRepository extends PagingAndSortingRepository<Person, Long> {
  List<Person> findByLastName(@Param("name") String name);  
}

运行应用程序并访问时http://localhost:8080/portfolio/search/，我得到以下响应正文：

{
  "_links" : {
    "findByLastName" : {
      "href" : "http://localhost:8080/people/search/findByLastName{?name}",
      "templated" : true
     }
  }
}

为什么findByFirstName即使在PersonRepository界面中可用也不暴露？

另外，有没有办法动态/以编程方式添加要通过REST公开的存储库？


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2020-04-12

共2个答案

小编典典

这些方法未公开的原因是，你基本上可以自由地在自定义存储库方法中实现所需的任何内容，因此不可能推理出支持该特定资源的正确HTTP方法。

在你的情况下，使用Plain可能很好GET，在其他情况下，可能必须使用a，POST因为该方法的执行会产生副作用。

当前的解决方案是设计一个自定义控制器来调用存储库方法。

2020-04-12
小编典典

我以这种方式解决了。

Custom Repository Interface:

public interface PersonRepositoryCustom {
    Page<Person> customFind(String param1, String param2, Pageable pageable);
}

Custom Repository Implementation

public class PersonRepositoryImpl implements PersonRepositoryCustom{

    @Override
    public Page<Person> customFind(String param1, String param2, Pageable pageable) {
        // custom query by mongo template, entity manager...
    }
}

Spring Data Repository:

@RepositoryRestResource(collectionResourceRel = "person", path = "person")
public interface PersonRepository extends MongoRepository<Person, String>, PersonRepositoryCustom {
    Page<Person> findByName(@Param("name") String name, Pageable pageable);
}

Bean Resource representation

public class PersonResource extends org.springframework.hateoas.Resource<Person>{

    public PersonResource(Person content, Iterable<Link> links) {
        super(content, links);
    }
}

Resource Assembler

@Component
public class PersonResourceAssembler extends ResourceAssemblerSupport<Person, PersonResource> {

    @Autowired
    RepositoryEntityLinks repositoryEntityLinks;

    public PersonResourceAssembler() {
        super(PersonCustomSearchController.class, PersonResource.class);
    }

    @Override
    public PersonResource toResource(Person person) {
        Link personLink = repositoryEntityLinks.linkToSingleResource(Person.class, person.getId());
        Link selfLink = new Link(personLink.getHref(), Link.REL_SELF);
        return new PersonResource(person, Arrays.asList(selfLink, personLink));
    }

}

Custom Spring MVC Controller

@BasePathAwareController
@RequestMapping("person/search")
public class PersonCustomSearchController implements ResourceProcessor<RepositorySearchesResource> {

    @Autowired
    PersonRepository personRepository;

    @Autowired
    PersonResourceAssembler personResourceAssembler;

    @Autowired
    private PagedResourcesAssembler<Person> pagedResourcesAssembler;

    @RequestMapping(value="customFind", method=RequestMethod.GET)
    public ResponseEntity<PagedResources> customFind(@RequestParam String param1, @RequestParam String param2, @PageableDefault Pageable pageable) {
        Page personPage = personRepository.customFind(param1, param2, pageable);
        PagedResources adminPagedResources = pagedResourcesAssembler.toResource(personPage, personResourceAssembler);

        if (personPage.getContent()==null || personPage.getContent().isEmpty()){
            EmbeddedWrappers wrappers = new EmbeddedWrappers(false);
            EmbeddedWrapper wrapper = wrappers.emptyCollectionOf(Person.class);
            List<EmbeddedWrapper> embedded = Collections.singletonList(wrapper);
            adminPagedResources = new PagedResources(embedded, adminPagedResources.getMetadata(), adminPagedResources.getLinks());
        }

        return new ResponseEntity<PagedResources>(adminPagedResources, HttpStatus.OK);
    }

    @Override
    public RepositorySearchesResource process(RepositorySearchesResource repositorySearchesResource) {
        final String search = repositorySearchesResource.getId().getHref();
        final Link customLink = new Link(search + "/customFind{?param1,param2,page,size,sort}").withRel("customFind");
        repositorySearchesResource.add(customLink);
        return repositorySearchesResource;
    }

}
2020-04-12