session在頁面刷新後關閉

 要使session在頁面刷新後關閉，可使用Filter過濾器。使用這種方法session必須是由ThreadLocal來管理，下myeclipse自動生成的SessionFactory類：


package com.sessionFactory;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

public class HibernateSessionFactory {

    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private  static Configuration configuration = new Configuration();  
    private static org.hibernate.SessionFactory sessionFactory;
    private static String configFile = CONFIG_FILE_LOCATION;

    static {
        try {
            configuration.configure(configFile);
            sessionFactory = configuration.buildSessionFactory();
        } catch (Exception e) {
            System.err
                    .println("%%%% Error Creating SessionFactory %%%%");
            e.printStackTrace();
        }
    }
    private HibernateSessionFactory() {
    }
  
  
    public static Session getSession() throws HibernateException {
        Session session = (Session) threadLocal.get();

        if (session == null || !session.isOpen()) {
            if (sessionFactory == null) {
                rebuildSessionFactory();
            }
            session = (sessionFactory != null) ? sessionFactory.openSession()
                    : null;
            threadLocal.set(session);
        }

        return session;
    }

  
    public static void rebuildSessionFactory() {
        try {
            configuration.configure(configFile);
            sessionFactory = configuration.buildSessionFactory();
        } catch (Exception e) {
            System.err
                    .println("%%%% Error Creating SessionFactory %%%%");
            e.printStackTrace();
        }
    }

    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) {
            session.close();
        }
    }

  
    public static org.hibernate.SessionFactory getSessionFactory() {
        return sessionFactory;
    }

  
    public static void setConfigFile(String configFile) {
        HibernateSessionFactory.configFile = configFile;
        sessionFactory = null;
    }

  
    public static Configuration getConfiguration() {
        return configuration;
    }

}



Filter類：


package com.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 com.sessionFactory.HibernateSessionFactory;

public class CloseSessionFilter implements Filter{

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

    public void doFilter(ServletRequest arg0, ServletResponse arg1,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
      
      
        try{
            chain.doFilter(arg0, arg1);
        }finally{
            try{
                HibernateSessionFactory.closeSession();
            }catch(Exception exc){
                exc.printStackTrace();
            }
        }
      
      
      
    }

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

}


最後在web.xml中添加過濾配置：


<filter>
    <filter-name>closeSessionFilter</filter-name>
    <filter-class>com.filter.CloseSessionFilter</filter-class>
  </filter>
  <filter-mapping>
        <filter-name>closeSessionFilter</filter-name>
        <url-pattern>需要過濾的頁面或其它</url-pattern>
  </filter-mapping>