如何删除Spring HATEOAS中的"_embedded"属性

Question

我正在使用Spring Boot和HATEOAS来构建REST API,当我的API返回一个集合时,它被包装在一个"_embedded"属性中,如下所示:

{
   "_links":{
      "self":{
         "href":"http://localhost:8080/technologies"
      }
   },
   "_embedded":{
      "technologies":[
         {
            "id":1,
            "description":"A",
            "_links":{
               "self":{
                  "href":"http://localhost:8080/technologies/1"
               }
            }
         },
         {
            "id":2,
            "description":"B",
            "_links":{
               "self":{
                  "href":"http://localhost:8080/technologies/2"
               }
            }
         }
      ]
   }
}

我希望响应是这样的:

{
   "_links":{
      "self":{
         "href":"http://localhost:8080/technologies"
      }
   },
   "technologies":[
      {
         "id":1,
         "description":"A",
         "_links":{
            "self":{
               "href":"http://localhost:8080/technologies/1"
            }
         }
      },
      {
         "id":2,
         "description":"B",
         "_links":{
            "self":{
               "href":"http://localhost:8080/technologies/2"
            }
         }
      }
   ]
}

我的技术控制器:

@RestController
@ExposesResourceFor(Technology.class)
@RequestMapping(value = "/technologies")
public class TechnologiesController {
    ...
    @ResquestMapping(method = RequestMethod.GET, produces = "application/vnd.xpto-technologies.text+json")
    public Resources<Resource<Technology>> getAllTechnologies() {
        List<Technology> technologies = technologyGateway.getAllTechnologies();
        Resources<<Resource<Technology>> resources = new Resources<Resource<Technology>>(technologyResourceAssembler.toResources(technologies));
        resources.add(linkTo(methodOn(TechnologiesController.class).getAllTechnologies()).withSelfRel());
        return resources;
    }

配置类具有注释@EnableHypermediaSupport(type = EnableHypermediaSupport.HypermediaType.HAL).

没有"_embedded"产生响应的最佳方法是什么？

Answer 1

正如文档所说

application/hal + json响应应发送给接受application/json的请求

为了省略_embedded您的回复,您需要添加

spring.hateoas.use-hal-as-default-json-media-type=false

到application.properties.

Answer 2

我关闭了 HAL 功能，因为很难通过 restTemplate 使用资源/资源。我通过以下代码禁用此功能：

public class SpringRestConfiguration implements RepositoryRestConfigurer {
    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {

        config.setDefaultMediaType(MediaType.APPLICATION_JSON);
        config.useHalAsDefaultJsonMediaType(false);
    }
}

它对我有用。如果restTemplate 有更多支持，HAL 会很好。

Answer 3

将此Accept标头添加到请求中:

Accept : application/x-spring-data-verbose+json