hibernateutil.java

用struts+hibernate实现案例

package hibernate;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.xml.*;


public class HibernateUtil {
	public static final SessionFactory sf;
	static{
		Configuration cfg=new Configuration().configure();
		sf=cfg.buildSessionFactory();		
	}
	public static final ThreadLocal tl=new ThreadLocal();

	public static Session currentSession(){
		Logger logger=Logger.getRootLogger();
		Session s=(Session)tl.get();
		logger.error("set session");
		if (s==null){
			logger.error("open session");
			s=sf.openSession();
			
		}
		return s;
	}
	
	public static void setSession(){
		Session se=(Session)tl.get();
		if (se==null){
			se=sf.openSession();
			tl.set(se);
		}
		
	}
}