java-springboot整合ElasticSearch8.2复杂查询-Toy模板网

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近期有大数据项目需要用到es，而又是比较新的es版本，网上也很少有8.x的java整合教程，所有写下来供各位参考。

首先

1.导包：

<dependency>
   <groupId>co.elastic.clients</groupId>
   <artifactId>elasticsearch-java</artifactId>
   <version>8.2.0</version>
</dependency>
<dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>elasticsearch-rest-client</artifactId>
   <version>8.2.0</version>
</dependency>

2.客户端连接代码EsUtilConfigClint：

一开始按照其他博主的方法，长时间连接不操作查询再次调用查询时会报错timeout，所以要设置RequestConfigCallback

import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.nio.reactor.IOReactorConfig;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

@Configuration
public class EsUtilConfigClint {
    /**
     * 客户端
     * @return
     * @throws IOException
     */
    @Bean
    public ElasticsearchClient elasticsearchClient(){
        RestClient client = RestClient.builder(new HttpHost("127.0.0.1", 9200,"http"))
                .setRequestConfigCallback(new RestClientBuilder.RequestConfigCallback() {
                    //设置修改长时间连接项目会报错timeout
                    @Override
                    public RequestConfig.Builder customizeRequestConfig(RequestConfig.Builder requestConfigBuilder) {
                        return requestConfigBuilder.setConnectTimeout(90000000)//25hours
                                .setSocketTimeout(90000000);
                    }
                })
                .setHttpClientConfigCallback((httpAsyncClientBuilder -> {
                    httpAsyncClientBuilder.disableAuthCaching();//禁用身份验证缓存
                    //显式设置keepAliveStrategy
                    httpAsyncClientBuilder.setKeepAliveStrategy((httpResponse, httpContext) -> TimeUnit.MINUTES.toMillis(3));
                    //显式开启tcp keepalive
                    httpAsyncClientBuilder.setDefaultIOReactorConfig(IOReactorConfig.custom().setSoKeepAlive(true).build());
                    return httpAsyncClientBuilder;
                })).build();
        ElasticsearchTransport transport = new RestClientTransport(client, new JacksonJsonpMapper());
        return new ElasticsearchClient(transport);
    }
}

3.增删改查：

数据实体类：

import lombok.Data;

@Data
public class EsMess {
    private String id;
    private String title;
    private String content;
    private Date createTime;
}

3.1.索引创建方法：

@Service
public class EsIndexService {
    @Resource
    private ElasticsearchClient client;

    public final static String INDEX_NAME = "test";

/**
     * 增加index
     * @throws IOException
     */
    public boolean create() throws IOException {
        CreateIndexResponse indexResponse = client.indices().create(c -> c.index(INDEX_NAME));
        System.out.println(indexResponse.toString());
        return indexResponse.acknowledged();
    }
}

3.2.新增数据：

@Service
public class EsService {
    @Resource
    private ElasticsearchClient client;

    public void add(EsMess esMess) throws IOException {
        IndexResponse indexResponse = client.index(i->i.index(EsIndexService.INDEX_NAME).id(esMess.getId()).document(esMess));
    }
}

3.3.修改数据：

/**
     * 更新Document
     * @throws IOException
     */
    public void update(EsMess esMess) throws IOException {
        UpdateResponse<EsMess> updateResponse = client.update(u -> u
                        .index(EsIndexService.INDEX_NAME)
                        .id(esMess.getId())
                        .doc(esMess)
                , EsMess.class);
    }

3.4.查询单条记录：

/**
     * 查询Document
     * @throws IOException
     */
    public EsMess get(String id) throws IOException {
        GetResponse<EsMess> getResponse = client.get(g -> g
                        .index(EsIndexService.INDEX_NAME)
                        .id(id)
                , EsMess.class
        );
        EsMess esMess = getResponse.source();
        return esMess;

    }

3.5.删除记录：

/**
     * 删除Document
     * @throws IOException
     */
    public void delete(String id) throws IOException {
        DeleteResponse deleteResponse = client.delete(d -> d
                .index(EsIndexService.INDEX_NAME)
                .id(id)
        );
    }

3.6.批量插入：

/**
     * 批量插入Document
     * @throws IOException
     */
    public void bulk(List<EsMess> esMessList) throws IOException {
        List<BulkOperation> bulkOperationArrayList = new ArrayList<>();
        for(EsMess esMess : esMessList){
            bulkOperationArrayList.add(BulkOperation.of(x->x.create(d->d.document(esMess).id(esMess.getId()).index(EsIndexService.INDEX_NAME))));
        }
        BulkResponse bulkResponse = client.bulk(b -> b.index(EsIndexService.INDEX_NAME).operations(bulkOperationArrayList));

    }

4.复杂查询

4.1.分页多字段查询(1w条数据以内):

    /**
     * search
     * key:查询内容
     * page:页数
     * limit:每页条数
     * @throws IOException
     */
public List<EsMess> search(String key,Integer page,Integer limit) throws IOException {
        SearchRequest.Builder builder = new SearchRequest.Builder();
        //设置查询索引
        builder.index(EsIndexService.INDEX_NAME);
        //组装查询条件
        BoolQuery.Builder boolQuery = new BoolQuery.Builder();
        if(StringUtil.isNotBlank(key)){
            boolQuery.should(q -> q.matchPhrasePrefix(m -> m
                    .query(key)
                    //字段名
                    .field("title")
            ));
            //多字段匹配
            boolQuery.should(q->q.matchPhrasePrefix(m->m.query(key).field("content")));
        }
        builder.query(q -> q.bool(boolQuery.build()));
        //分页
        if(page!=null && limit!=null){
            builder.from(page).size(limit);
        }
        //排序
        builder.sort(sortOptionsBuilder -> sortOptionsBuilder
                .field(fieldSortBuilder -> fieldSortBuilder
                        .field("createTime").order(SortOrder.Desc)));
        SearchResponse<EsMess> response = client.search(builder.build(), EsMess.class);
        List<EsMess> list = new ArrayList<>();
        List<Hit<EsMess>> hits = response.hits().hits();
        for (Hit<EsMess> hit : hits) {
            EsMess esMess = hit.source();
            list.add(esMess);
        }

        return list;
    }

4.2.searchafter(1w条数据以后的分页)+高亮查询+时间范围查询等

es中1w条数据以后如果使用form(page).size(limit)会报错Result window is too large, from + size must be less than or equal to: [10000] but was [100001]

有scroll查询或通过配置文件设置最大查询数量也可以解决但是太耗费性能

所以使用searchafter查询，需要注意的是searchafter查询需要对数据进行排序，查询下一页时需要设置唯一值id的排序，我使用的是id和createTime进行排序文章来源地址https://www.toymoban.com/news/detail-513856.html

    /**
     * 1w条数据以后的分页
     * @param key
     * @param page
     * @param limit
     * @param lastId 上一页最后一条数据唯一id
     * @param lastTime 上一页最后一条数据时间
     * @return
     * @throws IOException
     */
public List<EsMess> searchAfter(String key,Integer page,Integer limit,String lastId,long lastTime) throws IOException {
        SearchRequest.Builder builderAfter = new SearchRequest.Builder();
        builderAfter.index(EsIndexService.INDEX_NAME);
        BoolQuery.Builder boolQuery = new BoolQuery.Builder();
        //设置查询条件
        if(StringUtil.isNotBlank(key)){
            boolQuery.should(q -> q.matchPhrasePrefix(m -> m
                    .query(key)
                    .field("title")
            ));
            boolQuery.should(q->q.matchPhrasePrefix(m->m.query(key).field("content")));
        }
        //时间范围查询 paramMap startTime endTime
        //boolQuery.must(q->q.range(r->r.field("createTime").gte(JsonData.of(param.get("startTime"))).lte(JsonData.of(param.get("endTime")))));
        builderAfter.query(q -> q.bool(boolQuery.build()));
        //设置排序
        List<SortOptions> sorts = new ArrayList<>();
        SortOptions sortOptions2 = SortOptions.of(s -> s.field(f -> f.field("id.keyword").order(SortOrder.Desc)));
        SortOptions sortOptions = SortOptions.of(s -> s.field(f -> f.field("createTime").order(SortOrder.Desc)));
        //注意先后顺序
        sorts.add(sortOptions);
        sorts.add(sortOptions2);
        builderAfter.sort(sorts);
        builderAfter.size(limit);
        //第一页不需要设置，当第二页时需要带排序字段
        if(page>0){
            builderAfter.searchAfter(
                    String.valueOf(lastTime),
                    lastId
            );
        }
        //设置所有字段匹配高亮。注：高亮标签可根据前端需求自定义
        if(StringUtil.isNotBlank(key)){
            Highlight.Builder highlightBuilder = new Highlight.Builder();
            highlightBuilder.fields("*",new HighlightField.Builder().build()).preTags("<span style=\"color:red\">").postTags("</span>").requireFieldMatch(false);
            builderAfter.highlight(highlightBuilder.build());
        }
        //发送查询
        SearchResponse response = client.search(builderAfter.build(),EsMess.class);
        List<EsMess> list = new ArrayList<>();
        List<Hit<EsMess>> hits = response.hits().hits();
        for (Hit<EsMess> hit : hits) {
            EsMess esMess = hit.source();
            //获取高亮数据添加到实体类中返回
            Map<String,List<String>> highlightMap = hit.highlight();
            if(highlightMap!=null && !highlightMap.isEmpty()){
                highlightMap.keySet().forEach(k->{
                    try {
                        if(k.contains("keyword")){
                            k = k.replace(".keyword","");
                        }
                        Field field = esMess.getClass().getDeclaredField(k);
                        field.setAccessible(true);
                        field.set(esMess,highlightMap.get(k).get(0));
                    } catch (NoSuchFieldException e) {
                        throw new RuntimeException(e);
                    } catch (IllegalAccessException e) {
                        throw new RuntimeException(e);
                    }
                });
            }
            list.add(esMess);
        }
        return list;
    }

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