在Spring Data Elasticsearch 4.0中,可以通过以下步骤将SearchHits<T>返回类型转换为Page<T>返回类型:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
public interface MyElasticsearchRepository extends ElasticsearchRepository<MyEntity, Long> {
// 自定义查询方法
}
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.SearchHits;
public class MyElasticsearchRepositoryImpl implements MyElasticsearchRepository {
private final ElasticsearchOperations elasticsearchOperations;
public MyElasticsearchRepositoryImpl(ElasticsearchOperations elasticsearchOperations) {
this.elasticsearchOperations = elasticsearchOperations;
}
@Override
public Page<MyEntity> searchEntities(String keyword, Pageable pageable) {
SearchHits<MyEntity> searchHits = elasticsearchOperations.search(
new NativeSearchQueryBuilder()
.withQuery(QueryBuilders.matchQuery("fieldName", keyword))
.withPageable(pageable)
.build(),
MyEntity.class
);
List<MyEntity> entities = searchHits.stream()
.map(SearchHit::getContent)
.collect(Collectors.toList());
return new PageImpl<>(entities, pageable, searchHits.getTotalHits());
}
}
在上述示例中,我们通过ElasticsearchOperations的search方法执行了一个查询,并使用Stream API将SearchHits<T>对象转换为List<T>对象。然后,我们使用PageImpl类创建了一个Page<T>对象,并将转换后的List<T>对象、Pageable对象和总命中数作为参数传递给PageImpl的构造函数。
@Autowired
private MyElasticsearchRepository myElasticsearchRepository;
public Page<MyEntity> searchEntities(String keyword, Pageable pageable) {
return myElasticsearchRepository.searchEntities(keyword, pageable);
}
在上述示例中,我们通过@Autowired注解将自定义的ElasticsearchRepository接口注入到应用程序中,并使用该接口的searchEntities方法执行查询。
这样,你就可以在Spring Data Elasticsearch 4.0中将SearchHits<T>返回类型转换为Page<T>返回类型了。请注意,以上示例中的代码仅供参考,你需要根据自己的实际情况进行调整和扩展。
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