daofactory.java

来自「java学习的必要的资料,servlet的说明很好」· Java 代码 · 共 31 行

package com.estore.struts.utils;
/*
 * 产生dao的工厂，绑定在线程上面，单例，线程安全。
 * 
 */
public class DaoFactory {
	private static ThreadLocal<DaoFactory> threadLocal = new ThreadLocal<DaoFactory>();

	private DaoFactory() {

	}
	
	public static DaoFactory getInstance(){
		DaoFactory daoFactory=threadLocal.get();
		if(daoFactory==null){
			daoFactory=new DaoFactory();
			threadLocal.set(daoFactory);
		}
		return daoFactory;
	}
	
	public Object getDao(String daoName) throws StoreException{
		try{
			return Class.forName(daoName).newInstance();
		}catch(Exception ex){
			throw new StoreException(ex);
		}
		
	}
}