10、ES实战：在Spring框架中建立持久化连接-程序员快看-教程，程序员编程资料站

1、问题

后台跟Elasticsearch打交道需要建立起起客户端的连接，才能对Elasticsearch进行读写操作，频繁的建立连接、断开，将降低Elasticsearch的工作效率；建立持久化将减少后台与Elasticsearch建立客户端连接的时间，大大提高工作效率。

通过spring的配置文件将Elasticsearch以注入的方式建立持久化的连接将可以解决这个问题。

2、解决：

A、配置Spring文件

<!-- 数据仓库连接器 -->
<bean id="dwClient" class="com.ygsoft.apm.support.ElasticSearchClientFactoryBean">
     <property name="clusterName">
         <value>${dw.elasticsearch.clusterName}</value>
     </property>
     <property name="host">
         <value>${dw.elasticsearch.host}</value>
     </property>
     <property name="port">
         <value>${dw.elasticsearch.port}</value>
     </property>
</bean>

B、创建ElasticSearchClientFactoryBean.java

package com.ygsoft.apm.support;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.elasticsearch.client.Client;
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 org.springframework.beans.factory.FactoryBean;

/**
 * 功能描述：ElasticSearchClientFactoryBean
 * 作者：***
 * 创建时间：****年**月**日
 * 修改时间：
 * *******有限公司
 */
public class ElasticSearchClientFactoryBean implements FactoryBean<Client>{
   
     

    private String clusterName = "elasticsearch";
    private String host = "10.121.8.3";
    private Integer port = 9300;

    @SuppressWarnings("resource")
    @Override
    public Client getObject() throws Exception {
   
     
        try {
   
     
            //设置集群名称
            Settings settings = Settings.builder()
                .put("cluster.name", clusterName)
                .build();
            //创建client
            TransportClient client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new InetSocketTransportAddress
                    (InetAddress.getByName(host), port));
            return client;
        } catch (UnknownHostException e) {
   
     
            e.printStackTrace();
        }

        return null;
    }

    @Override
    public Class<?> getObjectType() {
   
     
        return Client.class;
    }

    @Override
    public boolean isSingleton() {
   
     
        return false;
    }

    public String getClusterName() {
   
     
        return clusterName;
    }

    public void setClusterName(String clusterName) {
   
     
        this.clusterName = clusterName;
    }

    public String getHost() {
   
     
        return host;
    }

    public void setHost(String host) {
   
     
        this.host = host;
    }

    public Integer getPort() {
   
     
        return port;
    }

    public void setPort(Integer port) {
   
     
        this.port = port;
    }
}

注：clusterName、host、port这三个参数可以通过.properties配置文件中获取，以方便部署。

C、在使用的方法中注入

@RestController
@RequestMapping({"/api/xxxxx"})
public class xxxxxController
{
  @Autowired
  private Client client;

  .......
}