java - 使用 Spring Data Core 中的 PagedResourcesAssembler 进行 HATEOAS 链接生成

Question

在 Spring Data JPA documentation它解释了如何使用 PagedResourcesAssembler 生成链接。该文档引用了 toResources() 方法，但据我所知该方法不存在。我已成功生成资源集合的链接，但我不知道如何生成子资源的链接。

这是我的 Controller :

public HttpEntity<PagedResources<Party>> search(@RequestBody PartySearchRequest request,
                                                    Pageable pageable, PagedResourcesAssembler<Party> assembler ) {

        Map<String,String> searchFilters = RequestValidator.validateContractSearchFilters(request);

        Page<Party> parties = repository.findByFirstNameOrLastName(searchFilters.get("firstName"), searchFilters.get("lastName"), pageable);

        return new ResponseEntity(assembler.toResource(parties), HttpStatus.OK);

    }

这会生成以下 JSON:

{
  "_embedded": {
    "partyList": [
      {
        "firstNm": "John",
        "lastNm": "Doe",
      },
      {
        "firstNm": "Bob",
        "lastNm": "Smith",
       }
        ],
      }
    ]
  },
  "_links": {
    "first": {
      "href": "http://localhost:8080/v1/party/search?page=0&size=2"
    },
    "self": {
      "href": "http://localhost:8080/v1/party/search?page=0&size=2"
    },
    "next": {
      "href": "http://localhost:8080/v1/party/search?page=1&size=2"
    },
    "last": {
      "href": "http://localhost:8080/v1/party/search?page=7&size=2"
    }
  },
  "page": {
    "size": 2,
    "totalElements": 16,
    "totalPages": 8,
    "number": 0
  }
}

正如您所看到的，我获得了整个当事人搜索的链接，但没有获得单个当事人对象的链接。 (我认为我的问题与这个问题类似: How to add HATEOAS links in a sub resource )但我不太确定，所以我发布了自己的问题。

任何帮助将不胜感激!谢谢!

Answer 1

您需要对扩展 ResourceAssemblerSupport 的类的引用。

这应该可行，将 myResourceAssembler 更改为您的类:

在你的 Controller 中:

private final MyResourceAssembler myResourceAssembler;

public MyController(MyResourceAssembler myResourceAssembler) {
   this.myResourceAssembler = myResourceAssembler;
}

public HttpEntity<PagedResources<Party>> search(@RequestBody PartySearchRequest request,
                                                Pageable pageable, PagedResourcesAssembler<Party> assembler ) {

    Map<String,String> searchFilters = RequestValidator.validateContractSearchFilters(request);

    Page<Party> parties = repository.findByFirstNameOrLastName(searchFilters.get("firstName"), searchFilters.get("lastName"), pageable);

    Link selfLink = linkTo(methodOn(this.getClass().view(pageable, null)).withSelfRel();

    return new ResponseEntity(assembler.toResource(parties, myResourceAssembler, selfLink), HttpStatus.OK);

}

而且，如果您不想要 selfLink:

return new ResponseEntity(assembler.toResource(parties, myResourceAssembler), HttpStatus.OK);

引用文献

• ResourceAssemblerSupport
• PagedResourcesAssembler