ElasticSearch（10）—SpringBoot集成ES

上一篇：ElasticSearch（9）—Rest风格

SpringBoot项目集成ES

一、引入依赖

   首先创建一个springboot项目，并勾选下图中的一些基本依赖：

官方文档es-client依赖

按照官方文档，springboot项目集成es首先需要导入es客户端，但是因为在创建项目的时候勾选了elasticsearch的起步依赖，查看该起步依赖发现底层已经引用了高级客户端 rest-high-level-client依赖。

然后在springboot项目的maven依赖中查看elasticsearch使用的依赖版本是6.8.7，

为了保证我们导入的依赖版本与es版本一致，所以手动调整es依赖的版本号，在pom.xml文件中进行调整：

二、创建客户端实例

@Configuration
public class ElasticSearchClientConfig {

  @Bean
  public RestHighLevelClient restHighLevelClient() {
    RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
        RestClient.builder(
            new HttpHost("127.0.0.1", 9200, "http")));
    //如果是集群，则在此处可以new 多个HttpHost
	//new HttpHost("127.0.0.1", 9201, "http")));
    return restHighLevelClient;
  }
}

二、测试es-api的使用

1.创建一个索引
创建一个实体类，将文档数据声明在该实体类中：

package org.magic.esapi.entiy;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data//生成set get方法
@AllArgsConstructor//有参构造函数
@NoArgsConstructor//无参构造函数
public class User {

  private String name;

  private Integer age;

  private String address;

}

2. 创建客户端实例

@Configuration
public class ElasticSearchClientConfig {

  @Bean
  public RestHighLevelClient restHighLevelClient() {
    RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
            //如果是集群，则此处可以多new 几个HttpHost
//            new HttpHost("localhost", 9200, "http"),
            new HttpHost("localhost", 9200, "http")));
    return client;
  }
}

3. 测试api的使用

以下api操作结果可是结合elasticsearch-head插件来查看操作的结果；

package org.magic.esapi;

import com.alibaba.fastjson.JSON;
import java.io.IOException;
import java.util.ArrayList;
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.RestHighLevelClient;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.search.SearchHit;
import org.junit.jupiter.api.Test;
import org.magic.esapi.entiy.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;

@SpringBootTest
class EsApiApplicationTests {

  private static final String index_name = "user_info";


  @Autowired
  private RestHighLevelClient restHighLevelClient;

  @Autowired
  private ElasticsearchRestTemplate elasticsearchRestTemplate;

  /**
   * 创建一个索引库
   *
   * @throws IOException
   */
  @Test
  void createIndex() throws IOException {
    boolean result = elasticsearchRestTemplate.createIndex("liqiang");
    System.out.println(result);
   /* CreateIndexRequest createIndexRequest = new CreateIndexRequest(index_name);
    CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
    //打印创建结果
    System.out.println(createIndexResponse.isAcknowledged());*/
  }

  /**
   * 判断索引库是否存在
   */
  @Test
  void searchIndex() throws IOException {
    GetIndexRequest request = new GetIndexRequest(index_name);
    boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
    System.out.println(exists);
  }

  /**
   * 删除索引库
   */
  @Test
  void removeIndex() throws IOException {

    DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest(index_name);
    AcknowledgedResponse response = restHighLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);
    //打印删除结果
    System.out.println(response.isAcknowledged());
  }

  /**
   * 创建文档
   */
  @Test
  void createDoc() throws IOException {
    User user = new User("张三", 20, "北京市");
    IndexRequest indexRequest = new IndexRequest(index_name);
    indexRequest.id("1");
    indexRequest.timeout("1s");
    IndexRequest request = indexRequest.source(JSON.toJSONString(user), XContentType.JSON);
    IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
    System.out.println(response.status());
  }

  /**
   * 查询文档
   */
  @Test
  void queryDoc() throws IOException {
    GetRequest getRequest = new GetRequest(index_name, "1");
    GetResponse response = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
    System.out.println(response.getSource());
  }

  /**
   * 修改文档
   */
  @Test
  void updateDoc() throws IOException {
    UpdateRequest updateRequest = new UpdateRequest(index_name, "1");
    User user = new User("李四", 55, "成都市");
    updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);
    updateRequest.timeout("1s");
    UpdateResponse response = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
    System.out.println(response.status());
  }

  /**
   * 删除指定文档
   */
  @Test
  void removeDoc() throws IOException {
    DeleteRequest deleteRequest = new DeleteRequest(index_name, "1");
    DeleteResponse response = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
    System.out.println(response.status());
  }

  /**
   * 批量插入文档
   */
  @Test
  void bulkCreateDoc() throws IOException {
    BulkRequest bulkRequest = new BulkRequest();
    bulkRequest.timeout("10s");
    ArrayList<User> userList = new ArrayList<>();
    for (int i = 0; i < 5; i++) {
      userList.add(new User("张三" + i, 25 + i, "成都" + i));
    }
    for (int i = 0; i < userList.size(); i++) {
      bulkRequest.add(new IndexRequest(index_name)
          .id(String.valueOf(i))
          .source(JSON.toJSONString(userList.get(i)), XContentType.JSON));
    }
    BulkResponse response = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
    System.out.println(response.status());
  }

  /**
   * 批量查询文档
   */
  @Test
  void queryDocList() throws IOException {
    SearchRequest searchRequest = new SearchRequest(index_name);

    /*


    //指定条件查询
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    //查询年龄为25的index_info索引库中的数据
    TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("age", 25);
    searchSourceBuilder.query(termQueryBuilder);
    searchRequest.source(searchSourceBuilder);
    SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    for (SearchHit hit : response.getHits()) {
      System.out.println(hit.getSourceAsString());
    }


     */

    //查询索引库中所有的文档数据
    SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    for (SearchHit hit : response.getHits()) {
      System.out.println(hit.getSourceAsString());
    }
  }
}