一個過濾器不僅解決了會話標識未更新同時還順帶解決了已解密的登錄請求

廢話不多說直接上代碼，少點套路，多點真誠。

過濾器代碼如下：

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;

/**
 * 
 * 會話標識未更新 
 * */
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相對地址  
                String url = httpRequest.getRequestURI();    
               System.out.println(url);    
                if (httpRequest.getSession() != null) {  
                    System.out.println("NewSessionFilter doFilter httpRequest.getSession().getId()"+ httpRequest.getSession().getId());  
                   //--------復制 session到臨時變量  
                    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());  
                    }  
                      
                   //-----------------復制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：

<!--配置過濾器 會話標識未更新 過濾  -->
    
    <filter>  
        <filter-name>NewSessionFilter</filter-name>  
        <filter-class>com.filter.NewSessionFilter</filter-class>  
    </filter> 
    <!--映射過濾器--> 
    <filter-mapping>
      <filter-name>NewSessionFilter</filter-name>
        <!--“/*”表示攔截所有的請求 -->
        <url-pattern>/*</url-pattern>
    </filter-mapping>