手把手教你Spring Boot2.x整合Elasticsearch（ES）

文末会附上完整的代码包供大家下载参考，码字不易，如果对你有帮助请给个点赞和关注，谢谢！

如果只是想看java对于Elasticsearch的操作可以直接看第四大点

一、docker部署Elasticsearch(下面简称es)单机版教程

1、部署es

• 拉取es镜像（这里我使用的版本是7.5.1）

  docker pull docker.elastic.co/elasticsearch/elasticsearch:7.5.1
  

• 构建容器并启动

  docker run -di --restart=always --name=es -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" -e ES_JAVA_OPTS="-Xms512m -Xmx512m" docker.elastic.co/elasticsearch/elasticsearch:7.5.1
  

  注意：es默认占用2G内存，我这里添加 -e ES_JAVA_OPTS="-Xms512m -Xmx512m" 参数指定占用内存

• 此时如果你访问 服务器ip:9200会出现无法访问的情况，这是因为还需要开启es的跨域访问

2、配置es允许跨域访问

• 进入es的容器

  docker exec -it es /bin/bash
  

• 执行命令 vi /usr/share/elasticsearch/config/elasticsearch.yml 编辑配置文件，在文件末尾添加下面的配置然后 wq 保存退出

  http.cors.enabled: true
  http.cors.allow-origin: "*"
  

• 执行 exit 命令退出容器，然后执行 docker restart es 命令重启es，然后再访问 服务器ip:9200 ，出现下图就表示单机版es搭建完成并可以远程访问了

注意：如果此时出现还是无法访问的，稍等几分钟后再刷新页面就好了，因为es重启是需要一些时间的

二、Elasticsearch(下面简称es)安装ik分词器教程

由于es自带没有中文分词器，所以这里添加大家用的比较多的ik分词器（注意ik分词器的版本必须和es版本一致）

• 首先执行docker exec -it es bash进入es的容器

• 然后执行cd /usr/share/elasticsearch/bin/进入bin目录然后执行下面的命令在线安装ik分词器

  ./elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.5.4/elasticsearch-analysis-ik-7.5.1.zip
  

• 执行cd ../plugins/进入plugins查看ik分词器是否成功安装

三、Elasticsearch(下面简称es)安装可视化插件head教程

• 拉取elasticsearch-head镜像

  docker pull mobz/elasticsearch-head:5
  

• 创建并启动容器

  docker run --restart=always --name elasticsearch-head -di -p 9100:9100 docker.io/mobz/elasticsearch-head:5
  

• 访问服务器ip:9100，然后输入服务器ip:9200，点击“连接”按钮

四、SpringBoot2.x整合Elasticsearch(下面简称es)教程

1、老规矩，先在pom.xml中添加es的依赖

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

2、在application.yml中添加es的配置

#elasticsearch配置
elasticsearch:
  rest:
    #es节点地址，集群则用逗号隔开
    uris: 10.24.56.154:9200

3、添加es的工具类ElasticSearchUtils.java，工具类中我只添加了常用的一些方法，大家可以根据需要自行完善

package com.example.study.util;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpHost;
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.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

/**
 * ElasticSearch工具类
 *
 * @author 154594742@qq.com
 * @date 2021/3/4 19:34
 */

@Slf4j
@Component
public class ElasticSearchUtils {

    @Value("${spring.elasticsearch.rest.uris}")
    private String uris;

    private RestHighLevelClient restHighLevelClient;

    /**
     * 在Servlet容器初始化前执行
     */
    @PostConstruct
    private void init() {
        try {
            if (restHighLevelClient != null) {
                restHighLevelClient.close();
            }
            if (StringUtils.isBlank(uris)) {
                log.error("spring.elasticsearch.rest.uris is blank");
                return;
            }

            //解析yml中的配置转化为HttpHost数组
            String[] uriArr = uris.split(",");
            HttpHost[] httpHostArr = new HttpHost[uriArr.length];
            int i = 0;
            for (String uri : uriArr) {
                if (StringUtils.isEmpty(uris)) {
                    continue;
                }

                try {
                    //拆分出ip和端口号
                    String[] split = uri.split(":");
                    String host = split[0];
                    String port = split[1];
                    HttpHost httpHost = new HttpHost(host, Integer.parseInt(port), "http");
                    httpHostArr[i++] = httpHost;
                } catch (Exception e) {
                    log.error(e.getMessage());
                }
            }
            RestClientBuilder builder = RestClient.builder(httpHostArr);
            restHighLevelClient = new RestHighLevelClient(builder);
        } catch (IOException e) {
            log.error(e.getMessage());
        }
    }

    /**
     * 创建索引
     *
     * @param index
     * @return
     */
    public boolean createIndex(String index) throws IOException {
        if (isIndexExist(index)) {
            log.error("Index is  exits!");
            return false;
        }
        //1.创建索引请求
        CreateIndexRequest request = new CreateIndexRequest(index);
        //2.执行客户端请求
        CreateIndexResponse response = restHighLevelClient.indices()
                .create(request, RequestOptions.DEFAULT);
        return response.isAcknowledged();
    }

    /**
     * 判断索引是否存在
     *
     * @param index
     * @return
     */
    public boolean isIndexExist(String index) throws IOException {
        GetIndexRequest request = new GetIndexRequest(index);
        return restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
    }

    /**
     * 删除索引
     *
     * @param index
     * @return
     */
    public boolean deleteIndex(String index) throws IOException {
        if (!isIndexExist(index)) {
            log.error("Index is not exits!");
            return false;
        }
        DeleteIndexRequest request = new DeleteIndexRequest(index);
        AcknowledgedResponse delete = restHighLevelClient.indices()
                .delete(request, RequestOptions.DEFAULT);
        return delete.isAcknowledged();
    }

    /**
     * 新增/更新数据
     *
     * @param object 要新增/更新的数据
     * @param index  索引，类似数据库
     * @param id     数据ID
     * @return
     */
    public String submitData(Object object, String index, String id) throws IOException {
        if (null == id) {
            return addData(object, index);
        }
        if (this.existsById(index, id)) {
            return this.updateDataByIdNoRealTime(object, index, id);
        } else {
            return addData(object, index, id);
        }
    }

    /**
     * 新增数据，自定义id
     *
     * @param object 要增加的数据
     * @param index  索引，类似数据库
     * @param id     数据ID,为null时es随机生成
     * @return
     */
    public String addData(Object object, String index, String id) throws IOException {
        if (null == id) {
            return addData(object, index);
        }
        if (this.existsById(index, id)) {
            return this.updateDataByIdNoRealTime(object, index, id);
        }
        //创建请求
        IndexRequest request = new IndexRequest(index);
        request.id(id);
        request.timeout(TimeValue.timeValueSeconds(1));
        //将数据放入请求 json
        request.source(JSON.toJSONString(object), XContentType.JSON);
        //客户端发送请求
        IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
        log.info("添加数据成功 索引为: {}, response 状态: {}, id为: {}", index, response.status().getStatus(), response.getId());
        return response.getId();
    }

    /**
     * 数据添加 随机id
     *
     * @param object 要增加的数据
     * @param index  索引，类似数据库
     * @return
     */
    public String addData(Object object, String index) throws IOException {
        return addData(object, index, UUID.randomUUID().toString().replaceAll("-", "").toUpperCase());
    }

    /**
     * 通过ID删除数据
     *
     * @param index 索引，类似数据库
     * @param id    数据ID
     * @return
     */
    public String deleteDataById(String index, String id) throws IOException {
        DeleteRequest request = new DeleteRequest(index, id);
        DeleteResponse deleteResponse = restHighLevelClient.delete(request, RequestOptions.DEFAULT);
        return deleteResponse.getId();
    }

    /**
     * 通过ID 更新数据
     *
     * @param object 要更新数据
     * @param index  索引，类似数据库
     * @param id     数据ID
     * @return
     */
    public String updateDataById(Object object, String index, String id) throws IOException {
        UpdateRequest updateRequest = new UpdateRequest(index, id);
        updateRequest.timeout("1s");
        updateRequest.doc(JSON.toJSONString(object), XContentType.JSON);
        UpdateResponse updateResponse = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
        log.info("索引为: {}, id为: {},updateResponseID：{}, 更新数据成功", index, id, updateResponse.getId());
        return updateResponse.getId();
    }

    /**
     * 通过ID 更新数据,保证实时性
     *
     * @param object 要增加的数据
     * @param index  索引，类似数据库
     * @param id     数据ID
     * @return
     */
    public String updateDataByIdNoRealTime(Object object, String index, String id) throws IOException {
        //更新请求
        UpdateRequest updateRequest = new UpdateRequest(index, id);

        //保证数据实时更新
        updateRequest.setRefreshPolicy("wait_for");

        updateRequest.timeout("1s");
        updateRequest.doc(JSON.toJSONString(object), XContentType.JSON);
        //执行更新请求
        UpdateResponse updateResponse = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
        log.info("索引为: {}, id为: {},updateResponseID：{}, 实时更新数据成功", index, id, updateResponse.getId());
        return updateResponse.getId();
    }

    /**
     * 通过ID获取数据
     *
     * @param index  索引，类似数据库
     * @param id     数据ID
     * @param fields 需要显示的字段，逗号分隔（缺省为全部字段）
     * @return
     */
    public Map<String, Object> searchDataById(String index, String id, String fields) throws IOException {
        GetRequest request = new GetRequest(index, id);
        if (StringUtils.isNotEmpty(fields)) {
            //只查询特定字段。如果需要查询所有字段则不设置该项。
            request.fetchSourceContext(new FetchSourceContext(true, fields.split(","), Strings.EMPTY_ARRAY));
        }
        GetResponse response = restHighLevelClient.get(request, RequestOptions.DEFAULT);
        return response.getSource();
    }

    /**
     * 通过ID判断文档是否存在
     *
     * @param index 索引，类似数据库
     * @param id    数据ID
     * @return
     */
    public boolean existsById(String index, String id) throws IOException {
        GetRequest request = new GetRequest(index, id);
        //不获取返回的_source的上下文
        request.fetchSourceContext(new FetchSourceContext(false));
        request.storedFields("_none_");
        return restHighLevelClient.exists(request, RequestOptions.DEFAULT);
    }

    /**
     * 批量插入false成功
     *
     * @param index   索引，类似数据库
     * @param objects 数据
     * @return
     */
    public boolean bulkPost(String index, List<?> objects) {
        BulkRequest bulkRequest = new BulkRequest();
        BulkResponse response = null;
        //最大数量不得超过20万
        for (Object object : objects) {
            IndexRequest request = new IndexRequest(index);
            request.source(JSON.toJSONString(object), XContentType.JSON);
            bulkRequest.add(request);
        }
        try {
            response = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null != response && response.hasFailures();
    }

    /**
     * 获取低水平客户端
     *
     * @return
     */
    public RestClient getLowLevelClient() {
        return restHighLevelClient.getLowLevelClient();
    }

    /**
     * 高亮结果集 特殊处理
     * map转对象 JSONObject.parseObject(JSONObject.toJSONString(map), Content.class)
     *
     * @param searchResponse
     * @param highlightField
     */
    private List<Map<String, Object>> setSearchResponse(SearchResponse searchResponse, String highlightField) {
        //解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            Map<String, HighlightField> high = hit.getHighlightFields();
            HighlightField title = high.get(highlightField);
            //原来的结果
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            //解析高亮字段,将原来的字段换为高亮字段
            if (title != null) {
                Text[] texts = title.fragments();
                StringBuilder nTitle = new StringBuilder();
                for (Text text : texts) {
                    nTitle.append(text);
                }
                //替换
                sourceAsMap.put(highlightField, nTitle.toString());
            }
            list.add(sourceAsMap);
        }
        return list;
    }

    /**
     * 查询并分页
     *
     * @param index          索引名称
     * @param query          查询条件
     * @param highlightField 高亮字段
     * @return
     */
    public List<Map<String, Object>> searchListData(String index,
                                                    SearchSourceBuilder query,
                                                    String highlightField) throws IOException {
        SearchRequest request = new SearchRequest(index);

        //高亮
        HighlightBuilder highlight = new HighlightBuilder();
        highlight.field(highlightField);
        //关闭多个高亮
        highlight.requireFieldMatch(false);
        highlight.preTags("<span style='color:red'>");
        highlight.postTags("</span>");
        query.highlighter(highlight);
        //不返回源数据。只有条数之类的数据。
        //builder.fetchSource(false);
        request.source(query);
        SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
        log.info("totalHits:" + response.getHits().getTotalHits());
        if (response.status().getStatus() == 200) {
            // 解析对象
            return setSearchResponse(response, highlightField);
        }
        return null;
    }
}

4、添加es控制器ElasticSearchController.java作为测试使用

package com.example.study.controller;

import com.example.study.model.entity.UserEntity;
import com.example.study.model.vo.ResponseVo;
import com.example.study.util.BuildResponseUtils;
import com.example.study.util.ElasticSearchUtils;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.common.Strings;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;
import java.util.Map;

/**
 * ElasticSearch控制器
 *
 * @author 154594742@qq.com
 * @date 2021/3/5 10:02
 */

@Api(tags = "ElasticSearch控制器")
@RestController
@RequestMapping("elasticSearch")
public class ElasticSearchController {

    @Autowired
    private ElasticSearchUtils elasticSearchUtils;

    /**
     * 新增索引
     *
     * @param index 索引
     * @return ResponseVo
     */
    @ApiOperation("新增索引")
    @PostMapping("index")
    public ResponseVo<?> createIndex(String index) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.createIndex(index));
    }

    /**
     * 索引是否存在
     *
     * @param index index
     * @return ResponseVo
     */
    @ApiOperation("索引是否存在")
    @GetMapping("index/{index}")
    public ResponseVo<?> existIndex(@PathVariable String index) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.isIndexExist(index));
    }

    /**
     * 删除索引
     *
     * @param index index
     * @return ResponseVo
     */
    @ApiOperation("删除索引")
    @DeleteMapping("index/{index}")
    public ResponseVo<?> deleteIndex(@PathVariable String index) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.deleteIndex(index));
    }

    /**
     * 新增/更新数据
     *
     * @param entity 数据
     * @param index  索引
     * @param esId   esId
     * @return ResponseVo
     */
    @ApiOperation("新增/更新数据")
    @PostMapping("data")
    public ResponseVo<String> submitData(UserEntity entity, String index, String esId) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.submitData(entity, index, esId));
    }

    /**
     * 通过id删除数据
     *
     * @param index index
     * @param id    id
     * @return ResponseVo
     */
    @ApiOperation("通过id删除数据")
    @DeleteMapping("data/{index}/{id}")
    public ResponseVo<String> deleteDataById(@PathVariable String index, @PathVariable String id) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.deleteDataById(index, id));
    }

    /**
     * 通过id查询数据
     *
     * @param index  index
     * @param id     id
     * @param fields 需要显示的字段，逗号分隔（缺省为全部字段）
     * @return ResponseVo
     */
    @ApiOperation("通过id查询数据")
    @GetMapping("data")
    public ResponseVo<Map<String, Object>> searchDataById(String index, String id, String fields) throws IOException {
        return BuildResponseUtils.buildResponse(elasticSearchUtils.searchDataById(index, id, fields));
    }

    /**
     * 分页查询（这只是一个demo）
     *
     * @param index index
     * @return ResponseVo
     */
    @ApiOperation("分页查询")
    @GetMapping("data/page")
    public ResponseVo<?> selectPage(String index) throws IOException {
        //构建查询条件
        BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
        //精确查询
        //boolQueryBuilder.must(QueryBuilders.wildcardQuery("name", "张三"));
        // 模糊查询
        boolQueryBuilder.filter(QueryBuilders.wildcardQuery("name", "张"));
        // 范围查询 from:相当于闭区间; gt:相当于开区间(>) gte:相当于闭区间 (>=) lt:开区间(<) lte:闭区间 (<=)
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("age").from(18).to(32));
        SearchSourceBuilder query = new SearchSourceBuilder();
        query.query(boolQueryBuilder);
        //需要查询的字段，缺省则查询全部
        String fields = "";
        //需要高亮显示的字段
        String highlightField = "name";
        if (StringUtils.isNotBlank(fields)) {
            //只查询特定字段。如果需要查询所有字段则不设置该项。
            query.fetchSource(new FetchSourceContext(true, fields.split(","), Strings.EMPTY_ARRAY));
        }
        //分页参数，相当于pageNum
        Integer from = 0;
        //分页参数，相当于pageSize
        Integer size = 2;
        //设置分页参数
        query.from(from);
        query.size(size);

        //设置排序字段和排序方式，注意：字段是text类型需要拼接.keyword
        //query.sort("age", SortOrder.DESC);
        query.sort("name" + ".keyword", SortOrder.ASC);

        return BuildResponseUtils.buildResponse(elasticSearchUtils.searchListData(index, query, highlightField));
    }
}

5、运行项目，然后访问 http://localhost:8080/swagger-ui.html 测试一下效果吧

* 这里我就只贴上分页查询的效果（相信这也是大家最需要的），其余的大家自行体验

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