一、前言
注:本文实现了Java对Elasticseach的分页检索/不分页检索的封装
ES就不用过多介绍了,直接上代码:
二、实现步骤:
- 创建Store类(与ES字段对应,用于接收ES数据)
import com.alibaba.fastjson2.annotation.JSONField;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
/**
* indexName 索引名称 理解为数据库名 限定小写
* type 理解为数据库的表名称
* shards 默认分区数
* replicas 每个分区默认的备份数
* refreshInterval 刷新间隔
* indexStoreType 索引文件存储类型
**/
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Document(indexName = yourIndex, shards = n, replicas = n, refreshInterval = n)
public class Store implements Serializable {
/**
* 属性,与ES字段对应
* 注:@Field注解:
* 若Java属性名与ES字段名不同,则根据@Field的name属性匹配ES字段
* 若Java属性名与ES字段名完全相同,则不用加该注解或name属性
*/
@Field(name = "yourESfield")
private String yourAttribute;
}
- Elasticsearch全文检索接口:不分页检索
import com.alibaba.fastjson2.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
@Slf4j
@Component
public class Elasticsearch{
@Autowired
private RestHighLevelClient restHighLevelClient;
/**
* 不分页检索
*
* @param yourIndex 索引
* @param builder 搜索条件
* @param sortField 排序属性
* @param sortOrder 排序方式
* @param clazz 返回类
* @param <T> 泛型
* @return 分页表格
*/
@SuppressWarnings("checkstyle:ParameterNumber")
public <T> List<T> searchListByCond(String yourIndex, BoolQueryBuilder builder, String sortField, SortOrder sortOrder, Class<T> clazz) {
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(builder);
if (StringUtils.isNotBlank(sortField)) {
sourceBuilder.sort(sortField, sortOrder);
}
SearchRequest request = new SearchRequest(yourIndex);
request.source(sourceBuilder);
SearchResponse response = null;
try {
response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
} catch (Exception e) {
log.error("Search Elasticsearch Error!", e);
}
if (response == null) {
return Collections.emptyList();
}
return Arrays.stream(response.getHits().getHits()).map(v -> JSON.parseObject(v.getSourceAsString(), clazz)).collect(Collectors.toList());
}
}
- Elasticsearch全文检索接口:分页检索
/**
* 分页检索
*
* @param yourIndex 索引
* @param builder 搜索条件
* @param page 分页参数(自己封装一个分页类,网上很多,easy)
* @param sortField 排序属性
* @param sortOrder 排序方式
* @param clazz 返回类
* @param <T> 泛型
* @return 分页表格
*/
@SuppressWarnings("checkstyle:ParameterNumber")
public <T> Page<T> searchPageByCond(String yourIndex, BoolQueryBuilder builder, Page<T> page, String sortField, SortOrder sortOrder, Class<T> clazz) {
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(builder);
sourceBuilder.from(Math.max(page.getOffset(), 0));
sourceBuilder.size(page.getLimit());
if (StringUtils.isNotBlank(sortField)) {
sourceBuilder.sort(sortField, sortOrder);
}
SearchRequest request = new SearchRequest(yourIndex);
request.source(sourceBuilder);
SearchResponse response = null;
try {
response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
} catch (Exception e) {
log.error("Search Elasticsearch Error!", e);
}
if (response == null) {
page.setRows(Collections.emptyList());
page.setTotal(0);
return page;
}
page.setRows(Arrays.stream(response.getHits().getHits()).map(v -> JSON.parseObject(v.getSourceAsString(), clazz)).collect(Collectors.toList()));
page.setTotal((int) response.getHits().getTotalHits().value);
return page;
}
三、总结
-
本文实现了Java对Elasticsearch搜索引擎全文检索的封装
-
传入索引、BoolQueryBuilder查询条件(选传)、排序方式(选传)、Store数据接收类文章来源:https://www.toymoban.com/news/detail-756950.html
-
即可完成对Elasticsearch的全文分页检索、不分页检索文章来源地址https://www.toymoban.com/news/detail-756950.html
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