Elasticsearch - java客户端连接

写在前面的话：读书破万卷，编码如有神
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最简单的在java客户端连接es服务器

（仅作为快速简单使用demo）

 package com.es.util.elasticsearch;

 import lombok.Data;
 import org.apache.log4j.Logger;
 import org.elasticsearch.action.search.SearchRequestBuilder;
 import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.client.transport.TransportClient;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.transport.client.PreBuiltTransportClient;
 import org.springframework.stereotype.Component;

 import javax.annotation.PostConstruct;
 import java.net.InetAddress;
 import java.net.UnknownHostException;

 /**
  * @author : huobaopaocai
  * @date : 2018/2/15 - 10:31
  * @Description : elasticsearch客户端
  */
 @Component("elasticsearchConstant")
 @Data
 public class ElasticsearchConstant {

     public static final Logger LOG = Logger.getLogger(ElasticsearchConstant.class);

     /**
      * es服务器地址
      */
     private String host = "127.0.0.1";

     /**
      * es服务器端口
      */
     private Integer port = 9300;

     /**
      * es集群名称
      */
     private String clusterName = "huobaopaocai-es-cluster";

     /**
      * es索引名称
      */
     private String esIndex = "ecommerce";

     /**
      * es索引下type名称
      */
     private String esType = "product";

     public TransportClient client = null;

     private SearchRequestBuilder requestBuilder;

     private Long TIME_OUT = 20L;

     @PostConstruct
     public void init() {
         Settings settings = Settings.builder()
                 .put("cluster.name", clusterName)
                 .put("client.transport.sniff", true)
                 .put("client.transport.ping_timeout", "600s")
                 .build();
         try {
             client = new PreBuiltTransportClient(settings)
                     .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port));
         } catch (UnknownHostException e) {
             LOG.error(e, e.getCause());
         }
     }

     /**
      * 初始化SearchRequestBuilder
      * @return
      */
     public SearchRequestBuilder initRequestBuilder() {
         requestBuilder = client.prepareSearch(esIndex).setTypes(esType);
         return requestBuilder;
     }

     /**
      * 执行es操作
      * @param requestBuilder
      * @return
      */
     public SearchResponse execute(SearchRequestBuilder requestBuilder) {
         SearchResponse searchResponse = requestBuilder.setTimeout(TimeValue.timeValueSeconds(TIME_OUT)).execute().actionGet();
         return searchResponse;
     }
 }

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