Apache的commons-pool池创建多线程使用WebClient

package test;

import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.apache.log4j.Logger;

import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.NicelyResynchronizingAjaxController;
import com.gargoylesoftware.htmlunit.WebClient;
//http://blog.csdn.net/m13321169565/article/details/8081410
public class PooledClientFactory{
    private static Logger log = Logger.getLogger(PooledClientFactory.class);
    private final static PooledClientFactory instance =new PooledClientFactory();
    //另外一种方案或许更为合适——对象池化技术。
    //基于Apache的commons-pool池
    private final GenericObjectPool clientPool =new GenericObjectPool();
    public static PooledClientFactory getInstance() {
        return instance;
    }
    
    public PooledClientFactory(){
        
        //实现对象池的对象创建工厂接口
        clientPool.setFactory(new PoolableObjectFactory() {
             // 创建对象实例，用于填充对象池。同时可以分配这个对象适用的资源。  
            @Override
            public Object makeObject() throws Exception  {
                log.info("为线程 [ " + Thread.currentThread().getName()+ 
                        " ] 创建新的WebClient实例!");
                
                 WebClient webClient = new WebClient(BrowserVersion.FIREFOX_17);  
                    
                   //设置webClient的相关参数  
                  webClient.getCookieManager().setCookiesEnabled(true);// 开启cookie管理
                    webClient.getOptions().setJavaScriptEnabled(true);// 开启js解析
                    webClient.getOptions().setCssEnabled(false);
                    // 当出现Http error时，程序不抛异常继续执行
                    webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
                    // 防止js语法错误抛出异常
                    webClient.getOptions().setThrowExceptionOnScriptError(false); // js运行错误时，是否抛出异常
                    webClient.getOptions().setTimeout(10000);
                    // 默认是false, 设置为true的话不让你的浏览行为被记录
                    webClient.getOptions().setDoNotTrackEnabled(false);
                    // 设置Ajax异步处理控制器即启用Ajax支持
                    webClient
                            .setAjaxController(new NicelyResynchronizingAjaxController());
                    return webClient;
            }
            
             // 销毁对象,销毁对象池时被调用,连接池调用invalidateObject(obj)时被调用 
            @Override
            public void destroyObject(Object arg0) throws Exception {
                  log.info("销毁对象：" + arg0);  
                WebClient client = (WebClient) arg0;
                client.closeAllWindows();
                client = null;
            }
            
            //  查询对象有效性,需要对象池设置setTestOnBorrow(true),无效对象将被destroy
            @Override
            public boolean validateObject(Object arg0) {
                 log.info("检查对象有效性：" + arg0);  
                return true;
            }

              // 激活一个对象,从对象池获取对象时被调用  

            @Override
            public void activateObject(Object arg0) throws Exception {
                 log.info("激活对象：" + arg0);  
            }
            
             // 挂起(钝化)一个对象,将对象还给对象池时被调用
            @Override
            public void passivateObject(Object arg0) throws Exception {
                
                 log.info("挂起对象：" + arg0);  
            }

        });
        
        clientPool.setTestOnBorrow(true);
        //借出对象达到最大值的最大等待时间,5s等待时间过后抛出异常
        //clientPool.setMaxWait(5000);
        //设置最大可借出数量,默认为8
        clientPool.setMaxActive(10);
    }

    
    
    
    
    
    
    public WebClient getClient()  {
        try {
            return (WebClient)this.clientPool.borrowObject();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        
    }
    
    public void returnClient(WebClient client) {
        try {
            this.clientPool.returnObject(client);
        } catch (Exception e) {
            e.printStackTrace();
        }
        }

    
      //测试对象池
      public static void main(String[] args) {
          try {
              //CursorableLinkedList
            //得到池中空闲的对象数量,如果不可用返回负数
                log.info(PooledClientFactory.getInstance().clientPool.getNumIdle());
                
       //取出对象1
        Object obj1=    PooledClientFactory.getInstance().getClient();
        //取出对象2
        Object obj2=    PooledClientFactory.getInstance().getClient();
        //取出对象3
                Object obj3=    PooledClientFactory.getInstance().getClient();    
            //如果对象借出达到最大数量MaxActive,程序会一直等待有可用的对象(归还的),也可以通过DEFAULT_MAX_WAIT设置等待时间，默认为-1一直等待
                PooledClientFactory.getInstance().getClient();    
                PooledClientFactory.getInstance().getClient();    
                PooledClientFactory.getInstance().getClient();    
                PooledClientFactory.getInstance().getClient();    
                PooledClientFactory.getInstance().getClient();    
                PooledClientFactory.getInstance().getClient();    
            //归还对象1
                
            
        PooledClientFactory.getInstance().returnClient((WebClient) obj1);
        
        //得到池中空闲的对象数量
        log.info(PooledClientFactory.getInstance().clientPool.getNumIdle());
         //    返回从池中借出的对象数量
        log.info(PooledClientFactory.getInstance().clientPool.getNumActive());
        
        //最大可借出数量
        log.info(PooledClientFactory.getInstance().clientPool.getMaxActive());
        //最大空闲数量
        log.info(PooledClientFactory.getInstance().clientPool.getMaxIdle());
        //最小空闲数量
        log.info(PooledClientFactory.getInstance().clientPool.getMinIdle());
        
        
        PooledClientFactory.getInstance().clientPool.clear();
        PooledClientFactory.getInstance().clientPool.close();
        
        //使用工厂创建一个对象
        PooledClientFactory.getInstance().clientPool.getMaxActive();
        } catch (Exception e) {
            
            e.printStackTrace();
        }
        
    }
}

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