Java操作Elasticsearch6.x简单示例
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文章目录
环境准备
因为还要使用idea编写Java,性能不够的机器不建议再开集群了,创建单节点的就行。
docker pull elasticsearch:6.5.4
docker run -d --name es -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" elasticsearch:6.5.4
Java操作
Maven
<dependencies>
<!-- elasticsearch依赖2.x的log4j -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.8.2</version>
</dependency>
<!-- elasticsearch的客户端 -->
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>6.5.4</version>
</dependency>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>6.5.4</version>
</dependency>
<!-- junit单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
</dependencies>
连接
package org.examples;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
// 先创建连接,工具类
public class ESClient {
public static RestHighLevelClient getClient(){
// 创建HttpHost对象
HttpHost httpHost = new HttpHost("127.0.0.1",9200);
// 创建RestClientBuilder
RestClientBuilder builder = RestClient.builder(httpHost);
// 创建RestHighLevelClien对象
RestHighLevelClient client = new RestHighLevelClient(builder);
return client;
}
}
示例
package org.examples;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.json.JsonXContent;
import org.codehaus.jackson.map.ObjectMapper;
import org.junit.Test;
import java.io.IOException;
import java.util.Date;
public class ESDemo {
String index = "person";
String type = "man";
@Test
public void createIndex() throws IOException {
//1、 准备关于索引的settings
Settings.Builder settings = Settings.builder()
.put("number_of_shards", 3)
.put("number_of_replicas", 1);
//2、 准备关于索引的结构mappings
XContentBuilder mappings = JsonXContent.contentBuilder()
.startObject()
.startObject("properties")
.startObject("name")
.field("type","text")
.endObject()
.startObject("age")
.field("type","integer")
.endObject()
.startObject("birthday")
.field("type","date")
.field("format","yyyy-MM-dd")
.endObject()
.endObject()
.endObject();
//2 将settings 和 mappings封装成一个request对象
CreateIndexRequest request = new CreateIndexRequest(index)
.settings(settings)
.mapping(type,mappings);
//3 通过client对象去链接es并执行创建索引
RestHighLevelClient client = ESClient.getClient();
CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
//测试
System.out.println("response"+response.toString());
}
//检查索引是否存在
@Test
public void exists() throws IOException {
//1 准备request对象
GetIndexRequest request = new GetIndexRequest();
request.indices(index);
// 2 通过client去检查
RestHighLevelClient client = ESClient.getClient();
boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
System.out.println(exists);
}
}
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