此过滤器的功能就是让Session始终保持着一个打开的状态：

 /**  
* @Title: OpenSessionFilter.java
* @Package org.web
* @Description: TODO该方法的主要作用：
* @author A18ccms A18ccms_gmail_com  
* @date 2017-4-19 下午6:51:37
* @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.hibernate.Session;
import org.hibernate.Transaction;
import org.util.HibernateUtil;/**   *    * 项目名称：struts_easyui   * 类名称：OpenSessionFilter   * 类描述：   * 创建人：Mu Xiongxiong  * 创建时间：2017-4-19 下午6:51:37   * 修改人：Mu Xiongxiong   * 修改时间：2017-4-19 下午6:51:37   * 修改备注：   * @version    *    */
public class OpenSessionFilter implements Filter {/**(非 Javadoc)* <p>Title: destroy</p>* <p>Description(描述): </p>* @see javax.servlet.Filter#destroy()*/@Overridepublic 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)*/@Overridepublic void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {Session session =null;Transaction tx=null;try {session =HibernateUtil.getSession();tx=session.beginTransaction();arg2.doFilter(arg0, arg1);tx.commit();} catch (Exception e) {tx.rollback();}}/**(非 Javadoc)* <p>Title: init</p>* <p>Description(描述): </p>* @param arg0* @throws ServletException* @see javax.servlet.Filter#init(javax.servlet.FilterConfig)*/@Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}}