JAVA操控ES

1.在pom.xml中引入依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    <version>2.6.7</version>
</dependency>

2.在application.yml进行配置

为了方便对常量的管理

elasticsearch.host=47.114.114.78:9200

3.编写Config类

import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.client.ClientConfiguration;
import org.springframework.data.elasticsearch.client.RestClients;
import org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;

@Configuration
public class RestClientConfig  extends AbstractElasticsearchConfiguration {
    @Value("${elasticsearch.host}")//体现出yml文件的作用
    private String host;
    @Override
    @Bean
    public RestHighLevelClient elasticsearchClient() {
        final ClientConfiguration clientConfiguration=ClientConfiguration.builder().connectedTo(host).build();
        return RestClients.create(clientConfiguration).rest();
    }
}

4.编写测试类

import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.xcontent.XContentType;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.IOException;

@SpringBootTest
public class TestIndex {
    private final RestHighLevelClient restHighLevelClient;
    @Autowired
    public TestIndex(RestHighLevelClient restHighLevelClient){
        this.restHighLevelClient=restHighLevelClient;
    }
    //创建索引和映射
    @Test
    public void testIndexAndMapping() throws IOException{
        CreateIndexRequest createIndexRequest = new CreateIndexRequest("products");
        createIndexRequest.mapping("{\n" +
                "   \"properties\": {\n" +
                "     \"id\":{\n" +
                "       \"type\": \"integer\"\n" +
                "     },\n" +
                "     \"title\":{\n" +
                "       \"type\": \"keyword\"\n" +
                "     },\n" +
                "     \"desc\":{\n" +
                "       \"type\":\"text\",\n" +
                "       \"analyzer\": \"ik_max_word\"\n" +
                "     }\n" +
                "   }\n" +
                " } ", XContentType.JSON);
        CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
        System.out.println("创建状态"+createIndexResponse.isAcknowledged());
        restHighLevelClient.close();
    }
    //删除索引
    @Test
    public void testDeleteIndex() throws IOException {
        AcknowledgedResponse acknowledgedResponse = restHighLevelClient.indices().delete(new DeleteIndexRequest("products"), RequestOptions.DEFAULT);
        System.out.println(acknowledgedResponse.isAcknowledged());
    }
}