构建基于Hibernate的servlet(1)

xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

tomcatJndi.HibernateAppListener


Retrieval
tomcatJndi.Retrieval


RetrieveViaHibernate
tomcatJndi.RetrieveViaHibernate


InsertViaHibernate
tomcatJndi.InsertViaHibernate 
 

Retrieval
/Retrieval


RetrieveViaHibernate
/RetrieveViaHibernate


InsertViaHibernate
/InsertViaHibernate

package tomcatJndi;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletContextEvent;
import org.apache.log4j.Logger;
import org.hibernate.Session;
public class HibernateAppListener implements ServletContextListener {
/*应用程序启动事件*/
public void contextInitialized(ServletContextEvent ce) {
Logger loggerConnect = Logger.getLogger("Connect");
try  {
loggerConnect.debug("In HibernateAppListener.contextInitialized");
Class.forName("tomcatJndi.HibernateUtil").newInstance();   
loggerConnect.debug("In HibernateAppListener， Class.forName for 
tomcatJndi.HibernateUtil successful");
}
catch (Exception e)  {
loggerConnect.debug("In HibernateAppListener， Class.forName for 
tomcatJndi.HibernateUtil throws Exception");
}
}
/*应用程序退出事件*/
public void contextDestroyed(ServletContextEvent ce) {}
}

package tomcatJndi;
import org.hibernate.*;
import org.hibernate.cfg.*;
import org.apache.log4j.Logger;
public class HibernateUtil { 
private static final SessionFactory sessionFactory;
static {
try {
Logger loggerRoot = Logger.getRootLogger();
Logger loggerConnect = Logger.getLogger("Connect");
loggerRoot.debug("In HibernateUtil try-clause");
loggerRoot.error("In HibernateUtil try-clause");
loggerConnect.debug("In HibernateUtil try-clause via loggerConnect DEBUG*****");
//从hibernate.cfg.xml中创建SessionFactory
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}