hibernate的OpenSessionInViewFilter用于管理session

OpenSessionInViewFilter.java

用到hibernate框架时可以在每一个项目中都写一个OpenSessionInViewFilter，用于管理session

package cn.jbit.auction.web;

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.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import cn.jbit.auction.dao.HibernateUtil;
import cn.jbit.auction.entity.Auctionuser;

public class OpenSessionInViewFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain arg2) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)arg0;
        
        Session session = null;
        Transaction tx = null;
        try {
            // 请求到达时，打开Session并启动事务
            session = HibernateUtil.currentSession();
            tx = session.beginTransaction();
            // 执行请求处理链
            arg2.doFilter(arg0, arg1);
            // 返回响应时，提交事务
            tx.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
            if (tx != null)
                tx.rollback();
        } finally {
            // 关闭session
            HibernateUtil.closeSession();
        }
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}