java - 调用 Spring Data Rest Repository 方法不返回链接

Question

我有存储库“ClientRepository”:

public interface ClientRepository extends PagingAndSortingRepository<Client, Long> {
}

当我请求http://localhost:8080/clients/1时然后服务器响应

{
  "algorithmId" : 1,
  "lastNameTxt" : "***",
  "firstNameTxt" : "**",
  "middleNameTxt" : "**",
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/clients/1121495168"
    },
    "client" : {
      "href" : "http://localhost:8080/clients/1121495168"
    }
  }
}

响应具有预期的链接。

当我在另一个 Controller 中调用存储库继承的方法 findOne 时

@RestController
public class SearchRestController {

    @Autowired
        public SearchRestController(ClientRepository clientRepository) {
            this.clientRepository = clientRepository;
    }

    @RequestMapping(value = "/search", method = RequestMethod.GET)
        Client readAgreement(@RequestParam(value = "query") String query,
                @RequestParam(value = "category") String category) {
    return clientRepository.findOne(Long.parseLong(query));
    }
}

它响应

{
      "algorithmId" : 1,
      "lastNameTxt" : "***",
      "firstNameTxt" : "**",
      "middleNameTxt" : "**"
}

为什么在第二种情况下响应不包含链接？如何让 Spring 将它们添加到响应中？

Answer 1

Why doesn't response contain links in the second case?

因为 Spring 返回您告诉它返回的内容:客户端。

What to do to make Spring add them to response?

在你的 Controller 方法中，你必须构建 Resource 并返回它。

根据您的代码，以下内容应该可以满足您的需求:

@RequestMapping(value = "/search", method = RequestMethod.GET)
Client readAgreement(@RequestParam(value = "query") String query,
                     @RequestParam(value = "category") String category) {
    Client client = clientRepository.findOne(Long.parseLong(query));
    BasicLinkBuilder builder = BasicLinkBuilder.linkToCurrentMapping()
                                               .slash("clients")
                                               .slash(client.getId());
    return new Resource<>(client,
                          builder.withSelfRel(),
                          builder.withRel("client"));
}

在此基础上，我还建议您:

• 使用/clients/search而不是/search，因为您搜索客户端(对于RESTful服务更有意义)
• 使用 RepositoryRestController，原因如下 here

这应该给你类似的东西:

@RepositoryRestController
@RequestMapping("/clients")
@ResponseBody
public class SearchRestController {

    @Autowired
    private ClientRepository clientRepository;

    @RequestMapping(value = "/search", method = RequestMethod.GET)
    Client readAgreement(@RequestParam(value = "query") String query,
                         @RequestParam(value = "category") String category) {
        Client client = clientRepository.findOne(Long.parseLong(query));
        ControllerLinkBuilder builder = linkTo(SearchRestController.class).slash(client.getId());

        return new Resource<>(client,
                builder.withSelfRel(),
                builder.withRel("client"));
    }
}