一 SpringBoot + Elasticsearch 项目环境搭建

1.1 修改pom文件添加依赖

目前使用spring-boot-starter-parent版本为2.2.8.RELEASE

对应spring-data-elasticsearch版本为2.2.8.RELEASE，版本对应可以自行百度，如果不行直接用elasticsearch-rest-high-level-client工具类吧

      <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId><version>2.2.8.RELEASE</version></dependency><dependency><groupId>org.elasticsearch</groupId><artifactId>elasticsearch</artifactId><version>7.5.0</version></dependency><dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-client</artifactId><version>7.5.0</version></dependency><dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-high-level-client</artifactId><version>7.5.0</version></dependency>

1.2 新建配置文件

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** ES配置类** @author lc* @version 1.0* @date 2022/3/25 10:53*/
@Configuration
public class ElasticSearchClientConfig {@Beanpublic RestHighLevelClient restHighLevelClient() {RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.1.100", 9200, "http")));return client;}
}

二 RestHighLevelClient的使用

RestHighLevelClient是Elasticsearch 的操作方法，我们先进行引用吧。

@Autowired
private RestHighLevelClient client;

1、创建索引

 @Testvoid testCreateIndex() throws IOException {//1 创建索引请求CreateIndexRequest request = new CreateIndexRequest("zlc_index");//2 客户端执行请求CreateIndexResponse createIndexResponse =client.indices().create(request, RequestOptions.DEFAULT);System.out.println(createIndexResponse);}

2、索引是否存在

@Testvoid testExistIndex() throws IOException {GetIndexRequest request = new GetIndexRequest("zlc_index");boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);System.out.println(exists);}

3、删除索引

@Testvoid testDeleteIndex() throws IOException {DeleteIndexRequest request = new DeleteIndexRequest("zlc_index");AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT);System.out.println(delete.isAcknowledged());}

4、添加文档

@Testvoid testAddDocument() throws IOException {//创建对象UserES user = new UserES();user.setUserName("suwerw");user.setUserPhone("178245774");//创建请求IndexRequest request = new IndexRequest("zlc_index");//规则 put /zlc_index/_doc/1request.id("1");request.timeout(TimeValue.timeValueSeconds(1));request.timeout("1s");//将数据放入请求request.source(JSON.toJSONString(user), XContentType.JSON);//客户端发送请求，获取响应结果IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);System.out.println(indexResponse.toString());System.out.println(indexResponse.status());}

5、判断文档是否存在

@Testvoid testIsExists() throws IOException {GetRequest getRequest = new GetRequest("zlc_index", "1");//不获取返回的 _source 的上下文，提高效率getRequest.fetchSourceContext(new FetchSourceContext(false));getRequest.storedFields("_none_");boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);System.out.println(exists);}

6、获取文档

 @Testvoid testGetDocument() throws IOException {GetRequest getRequest = new GetRequest("zlc_index", "1");GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);System.out.println(getResponse);System.out.println(getResponse.getSourceAsString());}

7、更新文档信息

 @Testvoid testUpdateDocument() throws IOException {UpdateRequest updateRequest = new UpdateRequest("zlc_index", "1");updateRequest.timeout("1s");UserES user = new UserES();user.setUserName("Zhou_LC");user.setUserPhone("233669");updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);System.out.println(updateResponse);System.out.println(updateResponse.status());}

8、删除文档

  @Testvoid testDeleteDocument() throws IOException {DeleteRequest deleteRequest = new DeleteRequest("zlc_index", "1");deleteRequest.timeout("1s");DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);System.out.println(deleteResponse);System.out.println(deleteResponse.status());}