Linux用docker安装Elasticsearch&&SpringBoot整合ES

一. 部署Elasticsearch

1. docker查询docker容器中的es

docker search elasticsearch

2. 安装（PS：查看自己的springBoot的版本号 对应的es版本安装）

docker pull elasticsearch:7.6.2

3. 查看已安装的docker镜像

docker images

4. 创建挂在目录

mkdir -p /data/elk/es/{config,data,logs}

5. 授权：docker中elasticsearch的用户UID是1000.

chown -R 1000:1000 /data/elk/es

6. 创建挂载配置文件

cd /data/elk/es/config
touch elasticsearch.yml
sudo vi elasticsearch.yml

#[elasticsearch.yml]
cluster.name: "geb-es"
network.host: 0.0.0.0
http.port: 9200

7. 运行elasticsearch

通过镜像，启动一个容器，并将9200和9300端口映射到本机（elasticsearch的默认端口是9200，我们把宿主环境9200端口映射到Docker容器中的4200端口）

docker run -it -d -p 4200:9200 -p 4300:9300 --name es -e ES_JAVA_OPTS="-Xms1g -Xmx1g" -e "discovery.type=single-node" --restart=always -v /date/data/elk/es/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml -v /date/data/elk/es/data:/usr/share/elasticsearch/data -v /date/data/elk/es/logs:/usr/share/elasticsearch/logs elasticsearch:7.6.2

8. 验证是否安装成功

curl http://localhost:4200

如上 es安装完成。

9. PS： ES的索引类似于milvus中的集合Collection不可重复

ES可以分不同的索引进行查询 然后不同索引中存储json格式的document文档来存储

二. SpringBoot整合ES

1. Java Maven项目中pom.xml引入ES的SDK

还是看springBoot对应的elasticsearch的版本，自行查看~

        <!-- ES 7.6.2 SDK -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.6.2</version>
        </dependency>

2. application.yml文件，设置es相关配置

elasticsearch:
  ip: 10.100.111.11
  port: 4200

3. 新建ES配置类（实体类略~）

package com.geb.common.config;

import org.apache.http.HttpHost;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class ElasticSearchConfig {

    @Value("${elasticsearch.ip}")
    private String ip;

    @Value("${elasticsearch.port}")
    private Integer port;

    @Bean
    public RestHighLevelClient restHighLevelClient() {
        return new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost(ip, port, "http")));
    }



}

4. Service业务接口处理类

package com.geb.service;


import com.baomidou.mybatisplus.extension.service.IService;
import com.geb.domain.IndexText;

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

/**
 * ES公共操作接口 service层
 * @author jx
 */
public interface EsService extends IService<IndexText> {

    /**
     * 判断索引库是否存在
     * @param index
     * @return
     */
    boolean checkIndexExists(String index) throws IOException;

    /**
     * 删除索引
     * @param index
     * @return
     * @throws IOException
     */
    boolean deleteIndex(String index) throws IOException;


    /**
     * 批量删除文本文档
     * @param index
     * @param idList
     * @throws IOException
     */
    void deleteDocument(String index, List<Long> idList) throws IOException;


    /**
     * 创建Es索引并存入documents数据入文档
     * @param indexTextList
     * @param indexName
     * @throws IOException
     */
    void saveData(List<IndexText> indexTextList, String indexName) throws IOException;


    /**
     * 根据keyword查询es相匹配的数据
     *
     * @param keyword  查询分词器
     * @param pageNo   当前页
     * @param pageSize 每页条数
     * @param indexName 索引名称
     * @return List<IndexText>
     */
    List<IndexText> search(String keyword, Integer pageNo, Integer pageSize, String indexName) throws Exception ;


}

5. Service业务具体实现类

package com.geb.service.impl;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.geb.common.utils.StringUtils;
import com.geb.domain.IndexText;
import com.geb.mapper.WdIndexTextMapper;
import com.geb.service.EsService;
import com.google.common.collect.Lists;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * ES服务实现类
 * @author aaa
 */
@Slf4j
@Service
@AllArgsConstructor
public class EsServiceImpl extends ServiceImpl<WdIndexTextMapper, IndexText> implements EsService {

    @Autowired
    private RestHighLevelClient client;

    private static final String TEXT = "text";

    /**************************************************************************** 索引操作 - 类似于milvus中的集合cllection **********************************************************************/

    // 创建索引
    public boolean createIndex(String index) throws IOException {
        CreateIndexRequest request = new CreateIndexRequest(index);
        CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println("索引创建状态: " + createIndexResponse.isAcknowledged());
        return createIndexResponse.isAcknowledged();
    }


    // 检查索引是否存在
    @Override
    public boolean checkIndexExists(String index) throws IOException {
        GetIndexRequest request = new GetIndexRequest();
        request.indices(index);
        boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
        System.out.println("索引存在: " + exists);
        return exists;
    }


    // 删除索引
    @Override
    public boolean deleteIndex(String index) throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest(index);
        AcknowledgedResponse deleteIndexResponse = client.indices().delete(request, RequestOptions.DEFAULT);
        System.out.println("索引删除状态: " + deleteIndexResponse.isAcknowledged());
        return deleteIndexResponse.isAcknowledged();
    }



    /**************************************************************************** documents操作 - 类似于milvus中的向量数据 **********************************************************************/


    /**
     * 删除文档
     * @param index
     * @param idList
     * @throws IOException
     */
    @Override
    public void deleteDocument(String index, List<Long> idList) throws IOException {
        // 批量删除数据
        BulkRequest request = new BulkRequest();
        for (Long id : idList) {
            request.add(new DeleteRequest().index(index).id(String.valueOf(id)));
        }
        BulkResponse response = client.bulk(request, RequestOptions.DEFAULT);
    }


    /**
     * 创建Es索引并存入documents数据入文档
     * @param indexTextList
     * @param indexName
     * @throws IOException
     */
    @Override
    public void saveData(List<IndexText> indexTextList, String indexName) throws IOException {
        // 判断该索引是否储存在
        boolean indexExit = checkIndexExists(indexName);
        // 不存在则直接创建索引
        if(!indexExit){
            createIndex(indexName);
        }
        // 存在-则批量存储在该索引中的数据文本document - 从数据库查询所有数据
        BulkRequest bulkRequest = new BulkRequest(indexName);
        for (IndexText indexText : indexTextList) {
            IndexRequest request = new IndexRequest();
            request.id(indexText.getId().toString());
            String jsonString = JSON.toJSONString(indexText);
            request.source(jsonString, XContentType.JSON);
            bulkRequest.add(request);
        }
        BulkResponse responses = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        System.out.println(responses.status());
    }



    /**
     * 根据keyword查询es相匹配的数据
     *
     * @param keyword  查询分词器
     * @param pageNo   当前页
     * @param pageSize 每页条数
     * @param indexName 索引名称
     * @return List<IndexText>
     */
    @Override
    public List<IndexText> search(String keyword, Integer pageNo, Integer pageSize, String indexName) throws Exception {
        List<Map<String, Object>> mapList = Lists.newArrayList(); // 获取到的List<Map<String, Object>>对象
        List<IndexText> resultList = Lists.newArrayList();
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.from((pageNo - 1) * pageSize);
        builder.size(pageSize);
        if (StringUtils.isBlank(keyword)) {  // 根据indexName全量查询该索引中的数据
            builder.query(QueryBuilders.matchAllQuery());
        } else {           // 根据keyword分词查询该索引中匹配的数据
            builder.query(QueryBuilders.matchQuery(TEXT, keyword));
        }
        builder.timeout(new TimeValue(60L, TimeUnit.SECONDS));
        try {
            SearchResponse response = client.search(new SearchRequest(indexName).source(builder), RequestOptions.DEFAULT);
            SearchHits responseHits = response.getHits();
            SearchHit[] hits = responseHits.getHits();
            if (hits.length > 0) {
                Arrays.stream(hits).forEach(e -> {
//                    float source = e.getScore();
//                    String sourceAsString = e.getSourceAsString();
                    mapList.add(e.getSourceAsMap());
                });
            }
            // 查询到的es数据Map -> List
            JSONArray jsonArray = new JSONArray();
            jsonArray.addAll(mapList);
            resultList = jsonArray.toJavaList(IndexText.class);
        } catch (Exception e) {
            throw new Exception(e);
        }
        return resultList;
    }


}

6. 测试结果查询（可自行编写单元测试/接口测试）

package com.geb.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.geb.common.core.controller.BaseController;
import com.geb.common.domain.R;
import com.geb.domain.IndexText;
import com.geb.domain.dto.VectorTextDataDto;
import com.geb.mapper.WdIndexTextMapper;
import com.geb.service.EsService;
import com.geb.service.IWdKnowledgeBaseService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

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


@RestController
@RequestMapping("/vector")
@Slf4j
public class VectorController extends BaseController {

    @Autowired
    private WdIndexTextMapper wdIndexTextMapper;

    @Autowired
    private EsService esService;


    @PostMapping("/saveEsData")
    @ApiOperation(value = "将用户信息保存进es中")
    public R<String> saveEsData() throws IOException {
        List<IndexText> indexTextList = wdIndexTextMapper.selectList(new LambdaQueryWrapper<IndexText>().eq(IndexText::getFileId, 56));
        esService.saveData(indexTextList, "test-es");
        return R.ok();
    }


    @GetMapping("/searchData/{query}")
    @ApiOperation(value = "es中查询数据")
    public R<List<IndexText>> searchData(@PathVariable String query) throws Exception {
        esService.checkIndexExists("test-es");
        return R.ok(esService.search(null, 1, 20, "test-es"));
    }


    @PostMapping("/createIndex")
    @ApiOperation(value = "es创建索引")
    public R<String> createIndex() throws IOException {
        esService.checkIndexExists("test-es");
        esService.deleteIndex("test-es");
//        List<Long> idList = new ArrayList<>();
//        idList.add(355L);
//        idList.add(362L);
//        idList.add(361L);
//        idList.add(360L);
//        idList.add(359L);
//        idList.add(358L);
//        esService.deleteDocument("test-es", idList);
        return R.ok();
    }
}