java实现遍历树形菜单方法——OpenSessionView实现

/**  
* @Title: OpenSessionView.java
* @Package org.util
* @Description: TODO该方法的主要作用：
* @author A18ccms A18ccms_gmail_com  
* @date 2017-5-6 下午1:48:25
* @version V1.0  
*/
package org.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 org.dao.BaseHibernateDao;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
 /**   
 *    
 * 项目名称：votedemo   
 * 类名称：OpenSessionView   
 * 类描述：   让session 始终保持着一个打开的状态
 * 创建人：Mu Xiongxiong  
 * 创建时间：2017-5-6 下午1:48:25   
 * 修改人：Mu Xiongxiong   
 * 修改时间：2017-5-6 下午1:48:25   
 * 修改备注：   
 * @version    
 *    
 */
public class OpenSessionView extends BaseHibernateDao implements Filter {
  /**(非 Javadoc)
   * <p>Title: destroy</p>
   * <p>Description(描述): </p>
   * @see javax.servlet.Filter#destroy()
   */
  @Override
  public void destroy() {
    // TODO Auto-generated method stub
  }
  /**(非 Javadoc)
   * <p>Title: doFilter</p>
   * <p>Description(描述): </p>
   * @param arg0
   * @param arg1
   * @param arg2
   * @throws IOException
   * @throws ServletException
   * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
   */
  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1,
      FilterChain arg2) throws IOException, ServletException {
    Session session = null;
    Transaction tx  = null;
    
    try {
      session = getSession();
      tx = session.beginTransaction();
      arg2.doFilter(arg0, arg1);
      tx.commit();
    } catch (Exception e) {
      e.printStackTrace();
      tx.rollback();
    }finally{
      closeSession();
    }
    
  }
  /**(非 Javadoc)
   * <p>Title: init</p>
   * <p>Description(描述): </p>
   * @param arg0
   * @throws ServletException
   * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
   */
  @Override
  public void init(FilterConfig arg0) throws ServletException {
    // TODO Auto-generated method stub
  }
}