废话不多说直接上代码，少点套路，多点真诚。
过滤器代码如下：
package com.filter;import java.io.IOException;import java.util.Enumeration;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;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.HttpSession;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * * 会话标识未更新 * */public class NewSessionFilter extends HttpServlet implements Filter { /** * */ private static final long serialVersionUID = 831349987977760012L; static ServletRequest request; private String url; private static final Logger logger = LoggerFactory.getLogger(NewSessionFilter.class); public static final String NEW_SESSION_INDICATOR = "com.filter.NewSessionFilter"; static HttpServletRequest request2 = (HttpServletRequest) request; public static void newSession(){ HttpSession session = request2.getSession(true); session.setAttribute(NEW_SESSION_INDICATOR, true); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { //System.out.println("NewSessionFilter doFilter"); if (request instanceof HttpServletRequest) { HttpServletRequest httpRequest = (HttpServletRequest) request; //取的url相对地址 String url = httpRequest.getRequestURI(); System.out.println(url); if (httpRequest.getSession() != null) { System.out.println("NewSessionFilter doFilter httpRequest.getSession().getId()"+ httpRequest.getSession().getId()); //--------复制 session到临时变量 HttpSession session = httpRequest.getSession(); HashMap old = new HashMap(); Enumeration keys = (Enumeration) session.getAttributeNames(); while (keys.hasMoreElements()){ String key = (String) keys.nextElement(); if (!NEW_SESSION_INDICATOR.equals(key)){ old.put(key, session.getAttribute(key)); session.removeAttribute(key); } } if (httpRequest.getMethod().equals("POST") && httpRequest.getSession() != null && !httpRequest.getSession().isNew() && httpRequest.getRequestURI().endsWith(url)){ session.invalidate(); session=httpRequest.getSession(true); logger.debug("new Session:" + session.getId()); } //-----------------复制session for (Iterator it = old.entrySet().iterator(); it.hasNext();) { Map.Entry entry = (Entry) it.next(); session.setAttribute((String) entry.getKey(), entry.getValue()); } } } chain.doFilter(request, response); // System.out.println("NewSessionFilter doFilter end"); } @Override public void destroy() { // System.out.println("NewSessionFilter destory"); } @Override public void init(FilterConfig filterConfig) throws ServletException { // System.out.println("NewSessionFilter init"); //System.out.println("NewSessionFilter init end"); }} web.xml配置如下：
NewSessionFilter com.filter.NewSessionFilter NewSessionFilter /*