Question

我创建了一个索引（房屋），其类型为“公寓”，其中包含20个文档。我使用邮递员将Json作为二进制文件上传到elasticsearch中。我有一个具有以下类的Spring Boot项目：

EsConfig.java -我已经配置了集群名称，这是application.properties文件中的默认名称。

@Configuration
@EnableElasticsearchRepositories(basePackages = "com.search.repository")
public class EsConfig {

@Value("${elasticsearch.clustername}")
private String EsClusterName;

@Bean
public Client esClient() throws UnknownHostException {
    Settings esSettings = Settings.builder()
            .put("cluster.name", EsClusterName)
            .put("client.transport.sniff", true)
            .put("client.transport.ignore_cluster_name", false)
            .build();


   TransportClient  client = new PreBuiltTransportClient(esSettings)
    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
    return client;

}

@Bean
public ElasticsearchOperations elasticsearchTemplate() throws Exception{
    return new ElasticsearchTemplate(esClient()); 
  }
}

Apartments.java -这是我的数据模型。这些文档在elasticsearch中具有以下字段。

@Document(indexName = "house", type = "apartments")
@JsonIgnoreProperties(ignoreUnknown=true)
public class Apartments {

   @Id
   private String id;
   @JsonProperty("Apartment_Name")
   private String apartmentName;
   @JsonProperty("Apartment_ID")
   private String apartmentId;
   @JsonProperty("Area_Name")
   private String areaName;

   //constructors along with getters and setters
}

ApartmentSearchRepository.java -这是扩展ElasticsearchRepository接口以执行原始操作的接口。

public interface ApartmentSearchRepository extends ElasticsearchRepository<Apartments, String> {
List<Apartments> findByApartmentName(String apartmentName);
}

EsApartmentService.java -

@Service
public class EsApartmentService {

@Autowired
ApartmentSearchRepository apartmentSearchRepository;

public List<Apartments> getApartmentByName(String apartmentName) {
    return apartmentSearchRepository.findByApartmentName(apartmentName);
   }
}

ApartmentController.java -我创建了一个端点，该端点应从elasticsearch中退回那20个文档。（另外，Apartment是我的项目中的POJO，而Apartments是数据模型。）

@Autowired
EsApartmentService esApartmentService;
@GetMapping(path = "/search",produces = "application/json")
public Set<Apartment> searchApartmentByName(
  @RequestParam(value = "apartmentName", defaultValue = "") String apartmentName) throws IOException {
  List<Apartment> apartments= new ArrayList<>();
  esApartmentService.getApartmentByName(apartmentName).forEach(apartment-> {
        apartments.add(new Apartment(apartment.getApartmentName(), apartment.getApartmentId(), apartment.getAreaName()));
    });
  return apartments.stream()
          .collect(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(Apartment::getApartmentId))));
}

此代码返回状态200，但响应为空。我尝试调试，但似乎无法从elasticsearch读取这些文档。我经历了几个解决方案，但是大多数解决方案都是从代码本身内部设置文档数据的。

我无法通过点击控制器中指定的端点来检索这些文档。有人可以让我知道我可能会错过的东西吗？谢谢！：）

编辑：以下屏幕截图显示了Postman中的查询和响应。

Answer 1

据我所知，您可以使用@JsonProperty来将POJO映射到查询响应，但是您失去了使用弹簧数据的动态查找器方法（findBy *）的能力。弹簧数据的动态查找器生成依赖于反射，并且POJO中的字段名称在其中变得很重要。

您介意更改POJO或文档中的字段名称以进行验证吗？或者只是定义一个自定义查询？还有一个功能强大的Java API，您可以在其中定义更复杂的查询：https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#elasticsearch.misc.filter

Answer 2

如上所述，@ ibexit删除了@JsonProperty，并在服务中使用了本机搜索查询构建器。另外，当我给apartment_Name时，它并没有使用Apartment_Name并起作用。（好像Elasticsearch遇到大小写问题，所以我在Camel Case中提供了它。）

我的更改：

Apartments.java -已删除@JsonProperty

@Document(indexName = "house", type = "apartments")
//@JsonIgnoreProperties(ignoreUnknown=true)
public class Apartments {

 @Id
 private String id;

 //@JsonProperty("apartment_ID")
 private String apartment_ID;

 //@JsonProperty("Area_Name")
 private String area_Name;

 //@JsonProperty("Apartment_Name")
 private String apartment_Name;
}

EsApartmentService.java -

@Service
public class EsApartmentService {
@Autowired
private  ElasticsearchTemplate elasticsearchTemplate; 

public List<Apartments> getApartmentByName(String apartmentName) {
   SearchQuery searchQuery = new NativeSearchQueryBuilder()           
  .withQuery(org.elasticsearch.index.query.QueryBuilders
    .matchQuery("apartment_Name", apartmentName)).build();
Page<Apartments> sampleEntities = 
    elasticsearchTemplate.queryForPage(searchQuery,Apartments.class);      
return sampleEntities.getContent();
  }
}

已删除 ApartmentSearchRepository.java 文件。

这些更改给了我所需的回复！：）

如何使用Spring Data从Elasticsearch中读取文档？

2 个答案: