SpringBoot封装Elasticsearch搜索引擎实现全文检索

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）

java 复制代码

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

java 复制代码

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

java 复制代码

/**
     * 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
即可完成对Elasticsearch的全文分页检索、不分页检索