使用java创建ES(ElasticSearch)连接池

1.首先要有一个创建连接的工厂类

package com.aly.util;


import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

/**
 * EliasticSearch连接池工厂对象
 * @author 00000
 *
 */
public class EsClientPoolFactory implements PooledObjectFactory<RestHighLevelClient>{

	@Override
	public void activateObject(PooledObject<RestHighLevelClient> arg0) throws Exception {
		System.out.println("activateObject");
		
	}
	
	/**
	 * 销毁对象
	 */
	@Override
	public void destroyObject(PooledObject<RestHighLevelClient> pooledObject) throws Exception {
		RestHighLevelClient highLevelClient = pooledObject.getObject();
		highLevelClient.close();
	}
	
	/**
	 * 生产对象
	 */
//	@SuppressWarnings({ "resource" })
	@Override
	public PooledObject<RestHighLevelClient> makeObject() throws Exception {
//		Settings settings = Settings.builder().put("cluster.name","elasticsearch").build();
		RestHighLevelClient client = null;
		try {
			/*client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"),9300));*/
			client = new RestHighLevelClient(RestClient.builder(
					new HttpHost("192.168.1.121", 9200, "http"), new HttpHost("192.168.1.122", 9200, "http"),
					new HttpHost("192.168.1.123", 9200, "http"), new HttpHost("192.168.1.125", 9200, "http"),
					new HttpHost("192.168.1.126", 9200, "http"), new HttpHost("192.168.1.127", 9200, "http")));

		} catch (Exception e) {
			e.printStackTrace();
		}
		return new DefaultPooledObject<RestHighLevelClient>(client);
	}

	@Override
	public void passivateObject(PooledObject<RestHighLevelClient> arg0) throws Exception {
		System.out.println("passivateObject");
	}

	@Override
	public boolean validateObject(PooledObject<RestHighLevelClient> arg0) {
		return true;
	}
	
	
}

2.然后再写我们的连接池工具类

package com.aly.util;

import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.elasticsearch.client.RestHighLevelClient;

/**
 * ElasticSearch 连接池工具类
 * 
 * @author 00000
 *
 */
public class ElasticSearchPoolUtil {
	// 对象池配置类，不写也可以，采用默认配置
	private static GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
	// 采用默认配置maxTotal是8，池中有8个client
	{
		poolConfig.setMaxTotal(8);
	}
	// 要池化的对象的工厂类，这个是我们要实现的类
	private static EsClientPoolFactory esClientPoolFactory = new EsClientPoolFactory();
	// 利用对象工厂类和配置类生成对象池
	private static GenericObjectPool<RestHighLevelClient> clientPool = new GenericObjectPool<>(esClientPoolFactory,
			poolConfig);

	/**
	 * 获得对象
	 * 
	 * @return
	 * @throws Exception
	 */
	public static RestHighLevelClient getClient() throws Exception {
		// 从池中取一个对象
		RestHighLevelClient client = clientPool.borrowObject();
		return client;
	}

	/**
	 * 归还对象
	 * 
	 * @param client
	 */
	public static void returnClient(RestHighLevelClient client) {
		// 使用完毕之后，归还对象
		clientPool.returnObject(client);
	}

}