在Spring Boot Data Rest中向HATEOAS响应添加更多信息

Question

我有以下REST控制器。

@RepositoryRestController
@RequestMapping(value = "/booksCustom")
public class BooksController extends ResourceSupport {

    @Autowired
    public BooksService booksService;

    @Autowired
    private PagedResourcesAssembler<Books> booksAssembler;

    @RequestMapping("/search")
    public HttpEntity<PagedResources<Resource<Books>>> search(@RequestParam(value = "q", required = false) String query, @PageableDefault(page = 0, size = 20) Pageable pageable) {
        pageable = new PageRequest(0, 20);

        Page<Books> booksResult = BooksService.findBookText(query, pageable);

        return new ResponseEntity<PagedResources<Resource<Books>>>(BooksAssembler.toResource(BooksResult), HttpStatus.OK);

    }

我的<代码>页

编辑：

型号：

@SolrDocument(solrCoreName = "Books_Core")
public class Books {
    @Field
    private String id;

    @Field
    private String filename;

    @Field("full_text")
    private String fullText;

    //Getters and setters omitted 
    ...
}

当搜索和SolrRepository被调用时（例如BooksService.findBookText（查询，可分页）；）我得到这些对象。

然而，在我的REST回复中，我只看到了“内容”。我希望能够将“突出显示的”对象添加到REST响应中。看起来HATEOAS只发送“content”对象中的信息（请参见下面的对象）。

{
  "_embedded" : {
    "solrBooks" : [ {
      "filename" : "ABookName",
      "fullText" : "ABook Text"
    } ]
  },
  "_links" : {
    "first" : {
      "href" : "http://localhost:8080/booksCustom/search?q=ABook&page=0&size=20"
    },
    "self" : {
      "href" : "http://localhost:8080/booksCustom/search?q=ABook"
    },
    "next" : {
      "href" : "http://localhost:8080/booksCustom/search?q=ABook&page=0&size=20"
    },
    "last" : {
      "href" : "http://localhost:8080/booksCustom/search?q=ABook&page=0&size=20"
    }
  },
  "page" : {
    "size" : 1,
    "totalElements" : 1,
    "totalPages" : 1,
    "number" : 0
  }
}

这是支持BooksService的存储库，您可以全面了解它。服务所做的就是调用这个SolrCrudRepository方法。

public interface SolrBooksRepository extends SolrCrudRepository<Books, String> {

    @Highlight(prefix = "<highlight>", postfix = "</highlight>", fragsize = 20, snipplets = 3)
    HighlightPage<SolrTestDocuments> findBookText(@Param("fullText") String fullText, Pageable pageable);

}

Answer 1

我正在使用页面

@RepositoryRestController
@RequestMapping(value = "/booksCustom")
public class BooksController extends ResourceSupport {

    @Autowired
    public BooksService booksService;

    @Autowired
    private PagedResourcesAssembler<Books> booksAssembler;

    @RequestMapping("/search")
    public HttpEntity<PagedResources<Resource<HighlightPage>>> search(@RequestParam(value = "q", required = false) String query, @PageableDefault(page = 0, size = 20) Pageable pageable) {

        HighlightPage solrBookResult = booksService.findBookText(query, pageable);
        Page<Books> highlightedPages = new PageImpl(solrBookResult.getHighlighted(), pageable, solrBookResult.getTotalElements());
        return new ResponseEntity<PagedResources<Resource<HighlightPage>>>(booksAssembler.toResource(highlightedPages), HttpStatus.OK); 
    }

可能是一种更好的方法，但是我找不到任何可以在不更改大量代码的情况下完成我想要它做的事情。希望这有所帮助！

Answer 2

好的，我是这样做的：我写了我的HighlightPagedResources

public class HighlightPagedResources<R,T> extends PagedResources<R> {

    private List<HighlightEntry<T>> phrases;

    public HighlightPagedResources(Collection<R> content, PageMetadata metadata, List<HighlightEntry<T>> highlightPhrases, Link... links) {
        super(content, metadata, links);
        this.phrases = highlightPhrases;
    }

    @JsonProperty("highlighting")
    public List<HighlightEntry<T>> getHighlightedPhrases() {
        return phrases;
    }
}

和HighlightPagedResourcesAssembler：

public class HighlightPagedResourcesAssembler<T> extends PagedResourcesAssembler<T> {

    public HighlightPagedResourcesAssembler(HateoasPageableHandlerMethodArgumentResolver resolver, UriComponents baseUri) {
        super(resolver, baseUri);
    }


    public <R extends ResourceSupport> HighlightPagedResources<R,T> toResource(HighlightPage<T> page, ResourceAssembler<T, R> assembler) {
        final PagedResources<R> rs = super.toResource(page, assembler);
        final Link[] links = new Link[rs.getLinks().size()];
        return new HighlightPagedResources<R, T>(rs.getContent(), rs.getMetadata(), page.getHighlighted(), rs.getLinks().toArray(links));
    }
}

我必须添加到我的SpringRepositoryRestMvcConfiguration.java：

@Primary
@Bean
public HighlightPagedResourcesAssembler solrPagedResourcesAssembler() {
    return new HighlightPagedResourcesAssembler<Object>(pageableResolver(), null);
}

在cotroller中，我不得不将PagedResourcesAssembler更改为新实现的一个，并在请求方法中使用新的HighlightPagedResources：

@Autowired
private HighlightPagedResourcesAssembler<Object> highlightPagedResourcesAssembler;

@RequestMapping(value = "/conversations/search", method = POST)

public HighlightPagedResources<PersistentEntityResource, Object> findAll(
        @RequestBody ConversationSearch search,
        @SortDefault(sort = FIELD_LATEST_SEGMENT_START_DATE_TIME, direction = DESC) Pageable pageable,
        PersistentEntityResourceAssembler assembler) {

    HighlightPage page = conversationRepository.findByConversationSearch(search, pageable);
    return highlightPagedResourcesAssembler.toResource(page, assembler);
}

结果：

  {
  "_embedded": {
    "conversations": [
    ..our stuff..
    ]
  },
  "_links": {
    ...as you know them...
  },
  "page": {
    "size": 1,
    "totalElements": 25,
    "totalPages": 25,
    "number": 0
  },
  "highlighting": [
    {
      "entity": {
        "conversationId": "a2127d01-747e-4312-b230-01c63dacac5a",
        ...
      },
      "highlights": [
        {
          "field": {
            "name": "textBody"
          },
          "snipplets": [
            "Additional XXX License for YYY Servers DCL-2016-PO0422 \n   \n<em>hi</em> bodgan  \n    \nwe urgently need the",
            "Additional XXX License for YYY Servers DCL-2016-PO0422\n \n<em>hi</em> bodgan\n \nwe urgently need the permanent"
          ]
        }
      ]
    }
  ]
}