先说下主要的类和接口
ObjectPool 接口是“池”定义，GenericObjectPool 是它的实现。
PooledObject 接口是“池对象”定义，DefaultPooledObject 是它的实现。
PooledObjectFactory 接口是“产生池对象的工厂”定义，BasePooledObjectFactory是它的实现。
下面我们先用以上几个类和接口搭建一个租车实例。
package com.pulsar.pool;
import org.apache.commons.pool2.BasePooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.commons.pool2.impl.GenericObjectPool; public class CPool { public static void main(String[] args){ CarFactory poolFactory = new CarFactory(); GenericObjectPool<Car> pool = new GenericObjectPool<>(poolFactory); try { Car car = pool.borrowObject(); System.out.println(car); } catch (Exception e) { e.printStackTrace(); } } static public class Car { public String toString(){ return "BMW"; } } static public class CarFactory extends BasePooledObjectFactory { @Override public Object create() throws Exception { return new DefaultPooledObject(new Car()); } @Override public PooledObject wrap(Object o) { return (PooledObject)o; } } }