Apache的commons
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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