Springboot整合Elasticsearch新版分页查询

其它插入、删除、简单查询都可以通过Repository调用方法查询。

分页查询

我在Springboot中集成的Elasticsearch的jar包版本是4.4.2。该版本版本已经弃用了ElasticsearchTemplate类，Repository里原来的search方法也已经弃用了。可以使用ElasticsearchRestTemplate类实现分页查询（包含高亮、搜索条件）

代码

package com.lzl.community;

import com.lzl.community.entity.DiscussPost;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.*;
import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@SpringBootTest
public class ElasticsearchTest {

    @Autowired
    private ElasticsearchRestTemplate elasticSearchRestTemplate;
    
    //搜索
    @Test
    public void testSearchByRepository() throws IOException {
        //构建搜索条件
        NativeSearchQuery build = new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.multiMatchQuery("互联网寒冬", "title", "content"))
                .withSorts(SortBuilders.fieldSort("type").order(SortOrder.DESC))
                .withSorts(SortBuilders.fieldSort("score").order(SortOrder.DESC))
                .withSorts(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
                .withPageable(PageRequest.of(0, 10))
                .withHighlightFields(
                        new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),
                        new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")
                )
                .build();
        SearchHits<DiscussPost> search = elasticSearchRestTemplate.search(build, DiscussPost.class);
        SearchPage<DiscussPost> page = SearchHitSupport.searchPageFor(search, build.getPageable());

		System.out.println(page.getTotalElements());
        System.out.println(page.getTotalPages());
        System.out.println(page.getNumber());
        System.out.println(page.getSize());
        for (SearchHit<DiscussPost> discussPostSearchHit : page) {
            System.out.println(discussPostSearchHit.getHighlightFields()); //高亮
            System.out.println(discussPostSearchHit.getContent());
        }

        //下面是将高亮部分封装到Page里边，好像也可以不用，要用到高亮内容时直接使用上边的discussPostSearchHit.getHighlightFields()应该也可以
        System.out.println("==============================================");
        List<DiscussPost> list = new ArrayList<>();
        for (SearchHit<DiscussPost> discussPostSearchHit : page) {
            DiscussPost discussPost = discussPostSearchHit.getContent();
            //discussPostSearchHit.getHighlightFields() //高亮
            if (discussPostSearchHit.getHighlightFields().get("title") != null) {
                discussPost.setTitle(discussPostSearchHit.getHighlightFields().get("title").get(0));
            }

            if (discussPostSearchHit.getHighlightFields().get("content") != null) {
                discussPost.setContent(discussPostSearchHit.getHighlightFields().get("content").get(0));
            }
            //System.out.println(discussPostSearchHit.getContent());
            list.add(discussPost);
        }
        PageImpl<DiscussPost> pageInfo = new PageImpl<DiscussPost>(list, build.getPageable(), search.getTotalHits());
        System.out.println(pageInfo.getTotalElements());
        System.out.println(pageInfo.getTotalPages());
        System.out.println(pageInfo.getNumber());
        System.out.println(pageInfo.getSize());
        for (DiscussPost discussPost : pageInfo) {
            System.out.println(discussPost);
        }
    }
}

结果：总共输出两次，以===============分界