session会话过期，项目返回首页

1.web.xml添加拦截器

2.自定义拦截器

/*
 * Copyright (c) 2017,TravelSky.
 * All Rights Reserved.
 * TravelSky CONFIDENTIAL
 */
package com.travelsky.eventanalysis.filter;

import java.io.IOException;
import java.io.PrintWriter;

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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SessionFilterimplements implements Filter
{

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

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
    {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        HttpSession session = httpRequest.getSession();
        // 登陆url
        String loginUrl = httpRequest.getContextPath() + "/common/login.jsp";
        String url = httpRequest.getRequestURI();
        String path = url.substring(url.lastIndexOf("/"));
        // 超时处理，ajax请求超时设置超时状态，页面请求超时则返回提示并重定向
        if (!"/execute".equals(path) && !"/login.jsp".equals(path) && !"/EventAnalysis/".equals(url) && session.getAttribute("username") == null)
        {
            // 判断是否为ajax请求
            if (httpRequest.getHeader("x-requested-with") != null && httpRequest.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest"))
            {
                httpResponse.addHeader("sessionstatus", "timeOut");
                httpResponse.addHeader("loginPath", loginUrl);
                chain.doFilter(request, response);// 不可少，否则请求会出错
            }
            else
            {
                String str = "<script language='javascript'>alert('会话过期,请重新登录');" + "window.top.location.href='" + loginUrl + "';</script>";
                response.setContentType("text/html;charset=UTF-8");// 解决中文乱码
                try
                {
                    PrintWriter writer = response.getWriter();
                    writer.write(str);
                    writer.flush();
                    writer.close();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
        else
        {
            chain.doFilter(request, response);
        }
    }

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

参考:https://www.jb51.net/article/85800.htm