Hibernate综合运用内部留言本（五）

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一懒加载优化方式

使用openSessionInView来优化懒加载。

二 openSessionInView原理图

三过滤器代码

package com.sina.filter;import java.io.IOException;import java.io.PrintWriter;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.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.hibernate.Session;import org.hibernate.Transaction;import com.sina.util.HibernateUtil;public class MyFilter1 extends HttpServlet implements Filter {    public void doFilter(ServletRequest arg0, ServletResponse arg1,            FilterChain arg2) throws IOException, ServletException {        // TODO Auto-generated method stub        Session s = null;        Transaction tx = null;        try {            s = HibernateUtil.getCurrentSession();            tx = s.beginTransaction();            arg2.doFilter(arg0, arg1);            // System.out.println("ok");            tx.commit();        } catch (Exception e) {            if (tx != null) {                tx.rollback();            }            throw new RuntimeException(e.getMessage());            // TODO: handle exception        } finally {            HibernateUtil.closeCurrentSession();        }    }    public void init(FilterConfig arg0) throws ServletException {        // TODO Auto-generated method stub            }}

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