ElasticSearch 7.1 java api 入門教程

ES版本號7.1.0  Transport 7.1.0 

pom.xml 依賴

<dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch</artifactId>
   <version>7.1.0</version>
</dependency>

<dependency>
   <groupId>org.elasticsearch.client</groupId>
   <artifactId>transport</artifactId>
   <version>7.1.0</version>
   <exclusions>
      <exclusion>
         <artifactId>netty</artifactId>
         <groupId>io.netty</groupId>
      </exclusion>
      <exclusion>
         <artifactId>netty-all</artifactId>
         <groupId>io.netty</groupId>
      </exclusion>
      <exclusion>
         <artifactId>transport-netty4-client</artifactId>
         <groupId>org.elasticsearch.plugin</groupId>
      </exclusion>
   </exclusions>
</dependency>

<dependency>
   <groupId>org.elasticsearch.plugin</groupId>
   <artifactId>transport-netty4-client</artifactId>
   <version>7.1.0</version>
</dependency>

package com.example.elastic_search;

import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import java.util.concurrent.ExecutionException;

/**
 * @author finerliu
 * @version 1.0
 * @date 2019-05-29  15:40
 * Created with IDEA 2018
 * copyright(c)
 */
public class EsClient {
    private static final String host_id = "127.0.0.1";
    private static TransportClient client;

    /**
     * 初始化es client
     */
    static {
        Settings setting = Settings.builder()
                .put("cluster.name", "elasticsearch")
                .put("client.transport.sniff", true)
                .build();
        try {
            client = new PreBuiltTransportClient(setting)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName(host_id), 9300));
            //.addTransportAddress(new TransportAddress(InetAddress.getByName("host2"), 9300));
        } catch (UnknownHostException e) {
            System.out.println(e);
        }

    }

    public static void main(String args[]) {
        String json = "{\"first_name\":\"finerliu\",\"last_name\":\"f\",\"age\":28,\"about\":\"I like sport.\",\"interests\":[\"sport\",\"music\"]}";
        //System.out.println(json);

        //put(json);
        //post();
        updateOrAdd();
        close();
    }

    /**
     * 通過手動json 添加數據
     *
     * @param json
     */
    public static void put(String json) {
        IndexResponse response = client.prepareIndex("you index", "employee")
                .setSource(json, XContentType.JSON).get();
        System.out.println(response);
    }

    /**
     * 查詢數據
     */
    public static void get() {
        GetResponse getResponse = client.prepareGet("you index", "employee", "1").get();
        System.out.println(getResponse);
    }

    /**
     * 通過XContentFactory 方式添加
     */
    public static void post() {
        try {
            IndexResponse response = client.prepareIndex("you index", "employee")
                    .setSource(XContentFactory.jsonBuilder()
                            .startObject()
                            .field("first_name", "pikaqiu")
                            .field("last_name", "pika")
                            .field("age", 33)
                            .field("about", "i like u")
                            .field("interests", "sport")
                            .field("date", new Date())
                            .endObject()).get();
            System.out.println(response);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 更新或者添加
     * 如果存在則更新，不存在添加
     */
    public static void updateOrAdd() {
        try {
            IndexRequest indexRequest = new IndexRequest("you index", "employee", "15")
                    .source(XContentFactory.jsonBuilder()
                            .startObject()
                            .field("imac", "10.14.5")
                            .field("name", "小蘋果.")
                            .endObject());

            UpdateRequest updateRequest = new UpdateRequest("you index", "employee", "15")
                    .doc(XContentFactory.jsonBuilder()
                            .startObject()
                            .field("imac", "10.14")
                            .endObject())
                    .upsert(indexRequest);
            UpdateResponse updateResponse = client.update(updateRequest).get();
            System.out.println(updateResponse);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }


    /**
     * 關閉連接
     */
    public static void close() {
        client.close();
    }
}