Session过期后自动跳转到登录页面的实例代码
1.在项目的web.xml文件中添加如下代码:
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<!--添加Session监听器--><listener><listener-class> 监听器路径 </listener-class></listener> |
2.编写java类。
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public class SessionListener implements HttpSessionListener {public void sessionCreated(HttpSessionEvent arg0) {// session创建时执行SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");String nowtimes = simpleFormat.format(new Date());User u=null;//System.out.println("执行。。 当前时间:"+nowtimes+"_"+u);HttpSession ses= arg0.getSession();String id=ses.getId()+"_"+ses.getCreationTime();}public void sessionDestroyed(HttpSessionEvent arg0) {// session失效时执行SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");String nowtimes = simpleFormat.format(new Date()); //System.out.println("session失效了。。 结束时间: "+nowtimes);}} |
配置完成后等session失效后成功进入sessionDestroyed方法,准备进行页面跳转操作,突然发现怎么写跳转,愣住了,继续上网请教大神,发现这个监听是做一些后台统计处理的,无法实现页面跳转的功能。
只能放弃这方法了,开始使用过滤器实现
1、web.xml中添加过滤器配置
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<filter><filter-name>sessionFilter</filter-name><filter-class>com.orchestrall.web.helper.session.SessionFilter</filter-class></filter><filter-mapping><filter-name>sessionFilter</filter-name><url-pattern>/actions/*</url-pattern></filter-mapping> |
2、新建SessionFilter类,实现Filter接口。
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public class SessionFilterimplements Filter {public void destroy() {// TODO Auto-generated method stub}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urlString loginUrl = httpRequest.getContextPath() + "/admin/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 (path.indexOf(".action") != -1&& session.getAttribute("LOGIN_SUCCESS") == 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);}}@Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}} |
3、客户端JS,用于ajax请求session超时
对于jquery
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<script type="text/javascript">$(document).ajaxComplete(function(event, xhr, settings) { if(xhr.getResponseHeader("sessionstatus")=="timeOut"){ if(xhr.getResponseHeader("loginPath")){alert("会话过期,请重新登陆!");window.location.replace(xhr.getResponseHeader("loginPath")); }else{ alert("请求超时请重新登陆 !"); } } }); </script> |
对于extjs的ajax请求
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Ext.Ajax.on('requestcomplete',checkUserSessionStatus, this);function checkUserSessionStatus(conn,response,options){if(response.getResponseHeader("sessionstatus") == 'timeout'){if(response.getResponseHeader("loginPath")){alert("会话过期,请重新登陆!");window.top.location.href = response.getResponseHeader("loginPath");}else{alert("请求超时请重新登陆 !");}}} |
如果使某个ajax请求不受全局方法的影响,那么可以在使用$.ajax()方法时,将参数中的global设置为false,jquery代码如下:
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$.ajax({url:"test.html",global:false//不触发全局ajax事件}) |

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