hibernatefilter.java

ajax博客系统,该文件内容部分综合网上的资源,自己进行了改进,转载请注明 汪建伟

package cn.hxex.blog.servlet;

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.blog.hibernate.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 {
 		request.setCharacterEncoding("GBK");

		SessionFactory sf = HibernateUtil.getSessionFactory();
		try {
			log.debug("Starting a database transaction");
			sf.getCurrentSession().beginTransaction();

			log.debug("Request Path:\t"
					+ ((HttpServletRequest) request).getServletPath());
			chain.doFilter(request, response);

			log.debug("Committing the database transaction");
			sf.getCurrentSession().getTransaction().commit();
		} catch (Throwable e) {
			e.printStackTrace();
			try {
				log.debug("Trying to rollback database transaction after exception");
				sf.getCurrentSession().getTransaction().rollback();
			} catch (Throwable rbEx) {
				log.error("Could not rollback transaction after exception!", rbEx);
			}
			throw new ServletException(e);
		}
	}

	public void init(FilterConfig filterConfig) throws ServletException {
	}

	public void destroy() {
	}

}