Elasticsearch7.8.0版本入门——JavaAPI操作（索引操作）

Posted 2023-02-16 小志的博客

目录

• • 一、创建索引代码示例
  • 二、查询索引代码示例
  • 二、删除索引代码示例

一、创建索引代码示例

• 创建索引代码示例

  package com.xz.esdemo.day1;
  
  import org.apache.http.HttpHost;
  import org.elasticsearch.client.RequestOptions;
  import org.elasticsearch.client.RestClient;
  import org.elasticsearch.client.RestHighLevelClient;
  import org.elasticsearch.client.indices.CreateIndexRequest;
  import org.elasticsearch.client.indices.CreateIndexResponse;
  
  import java.io.IOException;
  
  /**
   * @description: 创建索引
   * @author: xz
   */
  public class EsIndexCreate 
      public static void main(String[] args) throws IOException 
          // 创建 es 客户端对象
          RestHighLevelClient client = new RestHighLevelClient(
                  RestClient.builder(new HttpHost("localhost", 9200, "http"))
          );
  
          // 创建索引 - 请求对象
          CreateIndexRequest createIndexRequest = new CreateIndexRequest("role");
          // 发送请求，获取响应
          CreateIndexResponse createIndexResponse = client.indices().create(createIndexRequest, RequestOptions.DEFAULT);
          // 响应状态
          boolean acknowledged = createIndexResponse.isAcknowledged();
          System.out.println("响应状态===="+acknowledged);
  
          // 关闭 es 客户端连接
          client.close();
      
  
  

• 执行代码，查看控制台信息
  

• 使用postman工具查看创建索引是否成功,如下图表示JavaAPI操作创建索引成功
  

二、查询索引代码示例

• 查询索引代码示例

  package com.xz.esdemo.day1;
  
  import org.apache.http.HttpHost;
  import org.elasticsearch.client.RequestOptions;
  import org.elasticsearch.client.RestClient;
  import org.elasticsearch.client.RestHighLevelClient;
  import org.elasticsearch.client.indices.GetIndexRequest;
  import org.elasticsearch.client.indices.GetIndexResponse;
  
  import java.io.IOException;
  
  /**
   * @description: 查询索引
   * @author: xz
   */
  public class EsIndexSearch 
      public static void main(String[] args) throws IOException 
          // 创建 es 客户端对象
          RestHighLevelClient client = new RestHighLevelClient(
                  RestClient.builder(new HttpHost("localhost", 9200, "http"))
          );
  
          // 查询索引 请求对象
          GetIndexRequest request = new GetIndexRequest("role");
          // 发送请求，获取响应
          GetIndexResponse response = client.indices().get(request,
                  RequestOptions.DEFAULT);
  
          System.out.println("aliases:"+response.getAliases());
          System.out.println("mappings:"+response.getMappings());
          System.out.println("settings:"+response.getSettings());
  
          // 关闭 es 客户端连接
          client.close();
      
  
  

• 执行代码，查看控制台信息
  

二、删除索引代码示例

• 删除索引代码示例

  package com.xz.esdemo.day1;
  
  import org.apache.http.HttpHost;
  import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
  import org.elasticsearch.action.support.master.AcknowledgedResponse;
  import org.elasticsearch.client.RequestOptions;
  import org.elasticsearch.client.RestClient;
  import org.elasticsearch.client.RestHighLevelClient;
  import java.io.IOException;
  
  /**
   * @description: 删除索引
   * @author: xz
   */
  public class EsIndexDelete 
      public static void main(String[] args) throws IOException 
          // 创建 es 客户端对象
          RestHighLevelClient client = new RestHighLevelClient(
                  RestClient.builder(new HttpHost("localhost", 9200, "http"))
          );
  
          // 删除索引 请求对象
          DeleteIndexRequest request = new DeleteIndexRequest("role");
          // 发送请求，获取响应
          AcknowledgedResponse delete = client.indices().delete(request,
                  RequestOptions.DEFAULT);
  
          System.out.println("acknowledged:"+delete.isAcknowledged());
  
          // 关闭 es 客户端连接
          client.close();
      
  
  

• 执行代码，查看控制台信息
  

• 再使用postman工具查看删除索引是否成功,如下图表示JavaAPI操作删除索引成功。