hibernatefilter.java

这是本人做的投票系统的源码

package cn.hxex.vote.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.SessionFactory;

import cn.hxex.vote.util.HibernateUtil;

public class HibernateFilter implements Filter {
	private static Log log = LogFactory.getLog(HibernateFilter.class);
	
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		SessionFactory sf = HibernateUtil.getSessionFactory();
		if (sf!=null)
			System.out.println("in HibernateUtil: sf is not null");
		else
			System.out.println("in HibernateUtil: sf is null");
		try {
			log.debug("Starting a database transaction");
			sf.getCurrentSession().beginTransaction();
			
			log.debug("Request Path:\t" + ((HttpServletRequest)request).getServletPath());
			
			request.setCharacterEncoding("GB2312");
			chain.doFilter(request,response);
			
			log.debug("Committing the database transaction");
			sf.getCurrentSession().getTransaction().commit();
		}
		catch (Throwable ex) {
			ex.printStackTrace();
			try {
				sf.getCurrentSession().getTransaction().rollback();
			}
			catch (Throwable e) {
				log.error("Could not RollBack!", e);
			}
			throw new ServletException(ex);
		}
		finally {
			//sf.getCurrentSession().close();
		}
	}
	
	public void init(FilterConfig config) throws ServletException {
		
	}
	
	public void destroy() {
		
	}
}