ES入门 (11)Java API 操作（2）DDL 索引操作

ES 服务器正常启动后，可以通过 Java API 客户端对象对 ES 索引进行操作

1 创建索引

package com.atguigu.es.test;

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;

public class ESTest_Index_Create {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 创建索引
        CreateIndexRequest request = new CreateIndexRequest("user");
        CreateIndexResponse createIndexResponse =
                esClient.indices().create(request, RequestOptions.DEFAULT);

        // 响应状态
        boolean acknowledged = createIndexResponse.isAcknowledged();
        System.out.println("索引操作 ：" + acknowledged);

        esClient.close();
    }
}

操作结果:

2 查看索引

// 查询索引 - 请求对象
GetIndexRequest request = new GetIndexRequest("user");
// 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());

 

操作结果:

package com.atguigu.es.test;

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 org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.client.indices.GetIndexResponse;

public class ESTest_Index_Delete {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 查询索引
        DeleteIndexRequest request = new DeleteIndexRequest("user");

        AcknowledgedResponse response = esClient.indices().delete(request, RequestOptions.DEFAULT);

        // 响应状态
        System.out.println(response.isAcknowledged());

        esClient.close();
    }
}

3  删除索引

package com.atguigu.es.test;

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 org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.client.indices.GetIndexResponse;

public class ESTest_Index_Delete {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 查询索引
        DeleteIndexRequest request = new DeleteIndexRequest("user");

        AcknowledgedResponse response = esClient.indices().delete(request, RequestOptions.DEFAULT);

        // 响应状态
        System.out.println(response.isAcknowledged());

        esClient.close();
    }
}