手把手教你Spring Boot2.x整合Elasticsearch(ES)
阿新 • • 發佈:2021-03-07
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#如果只是想看java對於Elasticsearch的操作可以直接看第四大點
##一、docker部署Elasticsearch(下面簡稱es)單機版教程
###1、部署es
* 拉取es映象(這裡我使用的版本是7.5.1)
docker pull docker.elastic.co/elasticsearch/elasticsearch:7.5.1
* 構建容器並啟動
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預設佔用2G記憶體,我這裡新增 -e ES_JAVA_OPTS="-Xms512m -Xmx512m" 引數指定佔用記憶體
* 此時如果你訪問 伺服器ip:9200會出現無法訪問的情況,這是因為還需要開啟es的跨域訪問
![](https://img2020.cnblogs.com/blog/1543487/202103/1543487-20210304192423105-1987781301.png)
###2、配置es允許跨域訪問
* 進入es的容器
docker exec -it es /bin/bash
* 執行命令 `vi /usr/share/elasticsearch/config/elasticsearch.yml` 編輯配置檔案,在檔案末尾新增下面的配置然後 `wq` 儲存退出
http.cors.enabled: true
http.cors.allow-origin: "*"
* 執行 `exit` 命令退出容器,然後執行 `docker restart es` 命令重啟es,然後再訪問 伺服器ip:9200 ,出現下圖就表示單機版es搭建完成並可以遠端訪問了
![](https://img2020.cnblogs.com/blog/1543487/202103/1543487-20210304192310443-1519146707.png)
###注意:如果此時出現還是無法訪問的,稍等幾分鐘後再重新整理頁面就好了,因為es重啟是需要一些時間的
##二、Elasticsearch(下面簡稱es)安裝ik分詞器教程
###由於es自帶沒有中文分詞器,所以這裡新增大家用的比較多的ik分詞器(注意ik分詞器的版本必須和es版本一致)
* 首先執行`docker exec -it es bash`進入es的容器
* 然後執行`cd /usr/share/elasticsearch/bin/`進入bin目錄然後執行下面的命令線上安裝ik分詞器
./elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v7.5.1/elasticsearch-analysis-ik-7.5.1.zip
* 執行`cd ../plugins/`進入plugins檢視ik分詞器是否成功安裝
![](https://img2020.cnblogs.com/blog/1543487/202103/1543487-20210304151133551-220966758.png)
##三、Elasticsearch(下面簡稱es)安裝視覺化外掛head教程
* 拉取elasticsearch-head映象
docker pull mobz/elasticsearch-head:5
* 建立並啟動容器
docker run --restart=always --name elasticsearch-head -di -p 9100:9100 docker.io/mobz/elasticsearch-head:5
* 訪問伺服器ip:9100,然後輸入伺服器ip:9200,點選“連線”按鈕
![](https://img2020.cnblogs.com/blog/1543487/202103/1543487-20210304192208738-1172491496.png)
##四、SpringBoot2.x整合Elasticsearch(下面簡稱es)教程
###1、老規矩,先在pom.xml中新增es的依賴
###2、在application.yml中新增es的配置
#elasticsearch配置
elasticsearch:
rest:
#es節點地址,叢集則用逗號隔開
uris: 10.24.56.154:9200
###3、新增es的工具類ElasticSearchUtils.java,工具類中我只添加了常用的一些方法,大家可以根據需要自行完善
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工具類
*
* @author [email protected]
* @date 2021/3/4 19:34
*/
@Slf4j
@Component
public class ElasticSearchUtils {
@Value("${spring.elasticsearch.rest.uris}")
private String uris;
private RestHighLevelClient restHighLevelClient;
/**
* 在Servlet容器初始化前執行
*/
@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中的配置轉化為HttpHost陣列
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和埠號
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());
}
}
/**
* 建立索引
*
* @param index
* @return
*/
public boolean createIndex(String index) throws IOException {
if (isIndexExist(index)) {
log.error("Index is exits!");
return false;
}
//1.建立索引請求
CreateIndexRequest request = new CreateIndexRequest(index);
//2.執行客戶端請求
CreateIndexResponse response = restHighLevelClient.indices()
.create(request, RequestOptions.DEFAULT);
return response.isAcknowledged();
}
/**
* 判斷索引是否存在
*
* @param index
* @return
*/
public boolean isIndexExist(String index) throws IOException {
GetIndexRequest request = new GetIndexRequest(index);
return restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
}
/**
* 刪除索引
*
* @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/更新資料
*
* @param object 要新增/更新的資料
* @param index 索引,類似資料庫
* @param id 資料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);
}
}
/**
* 新增資料,自定義id
*
* @param object 要增加的資料
* @param index 索引,類似資料庫
* @param id 資料ID,為null時es隨機生成
* @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);
}
//建立請求
IndexRequest request = new IndexRequest(index);
request.id(id);
request.timeout(TimeValue.timeValueSeconds(1));
//將資料放入請求 json
request.source(JSON.toJSONString(object), XContentType.JSON);
//客戶端傳送請求
IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
log.info("新增資料成功 索引為: {}, response 狀態: {}, id為: {}", index, response.status().getStatus(), response.getId());
return response.getId();
}
/**
* 資料新增 隨機id
*
* @param object 要增加的資料
* @param index 索引,類似資料庫
* @return
*/
public String addData(Object object, String index) throws IOException {
return addData(object, index, UUID.randomUUID().toString().replaceAll("-", "").toUpperCase());
}
/**
* 通過ID刪除資料
*
* @param index 索引,類似資料庫
* @param id 資料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();
}
/**
* 通過ID 更新資料
*
* @param object 要更新資料
* @param index 索引,類似資料庫
* @param id 資料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("索引為: {}, id為: {},updateResponseID:{}, 更新資料成功", index, id, updateResponse.getId());
return updateResponse.getId();
}
/**
* 通過ID 更新資料,保證實時性
*
* @param object 要增加的資料
* @param index 索引,類似資料庫
* @param id 資料ID
* @return
*/
public String updateDataByIdNoRealTime(Object object, String index, String id) throws IOException {
//更新請求
UpdateRequest updateRequest = new UpdateRequest(index, id);
//保證資料實時更新
updateRequest.setRefreshPolicy("wait_for");
updateRequest.timeout("1s");
updateRequest.doc(JSON.toJSONString(object), XContentType.JSON);
//執行更新請求
UpdateResponse updateResponse = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
log.info("索引為: {}, id為: {},updateResponseID:{}, 實時更新資料成功", index, id, updateResponse.getId());
return updateResponse.getId();
}
/**
* 通過ID獲取資料
*
* @param index 索引,類似資料庫
* @param id 資料ID
* @param fields 需要顯示的欄位,逗號分隔(預設為全部欄位)
* @return
*/
pu