Elasticsearch的JavaAPI

1、依赖

<dependencies>

        <!-- es的客户端-->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.6.0</version>
        </dependency>

        <!-- 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>

        <!-- 单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>


    </dependencies>

2、代码

import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

import java.net.InetAddress;


public class HelloWorld {

    public static void main(String[] args) {

        try {

            //设置集群名称
            Settings settings = Settings.builder()
                    .put("cluster.name", "my-es")
                    .build();
            //创建client
            TransportClient client = new PreBuiltTransportClient(settings).addTransportAddresses(
                    //用java访问ES用的端口是9300
                    new InetSocketTransportAddress(InetAddress.getByName("hdp-1"), 9300),
                    new InetSocketTransportAddress(InetAddress.getByName("hdp-2"), 9300),
                    new InetSocketTransportAddress(InetAddress.getByName("hdp-3"), 9300));
            //搜索数据（.actionGet()方法是同步的，没有返回就等待）
            GetResponse response = client.prepareGet("search", "article", "1").execute().actionGet();
            //输出结果
            System.out.println(response);
            //关闭client
            client.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}