最近做了一個項(xiàng)目其中有需求，要實(shí)現(xiàn)自動登錄功能，通過查閱相關(guān)資料，打算用session監(jiān)聽來做，下面給大家列出了配置監(jiān)聽器的方法：
1.在項(xiàng)目的web.xml文件中添加如下代碼：
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2.編寫java類。
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public class SessionListener implements HttpSessionListener {public void sessionCreated(HttpSessionEvent arg0) {// session創(chuàng)建時(shí)執(zhí)行SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");String nowtimes = simpleFormat.format(new Date());User u=null;//System.out.println("執(zhí)行。。 當(dāng)前時(shí)間："+nowtimes+"_"+u);HttpSession ses= arg0.getSession();String id=ses.getId()+"_"+ses.getCreationTime();}public void sessionDestroyed(HttpSessionEvent arg0) {// session失效時(shí)執(zhí)行SimpleDateFormat simpleFormat = new SimpleDateFormat("mm-ss-ms");String nowtimes = simpleFormat.format(new Date()); //System.out.println("session失效了。。 結(jié)束時(shí)間： "+nowtimes);}} |
配置完成后等session失效后成功進(jìn)入sessionDestroyed方法，準(zhǔn)備進(jìn)行頁面跳轉(zhuǎn)操作，突然發(fā)現(xiàn)怎么寫跳轉(zhuǎn)，愣住了，繼續(xù)上網(wǎng)請教大神，發(fā)現(xiàn)這個監(jiān)聽是做一些后臺統(tǒng)計(jì)處理的，無法實(shí)現(xiàn)頁面跳轉(zhuǎn)的功能。
只能放棄這方法了，開始使用過濾器實(shí)現(xiàn)
1、web.xml中添加過濾器配置
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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類，實(shí)現(xiàn)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();// 登陸urlString loginUrl = httpRequest.getContextPath() + "/admin/login.jsp";String url = httpRequest.getRequestURI();String path = url.substring(url.lastIndexOf("/"));// 超時(shí)處理，ajax請求超時(shí)設(shè)置超時(shí)狀態(tài)，頁面請求超時(shí)則返回提示并重定向if (path.indexOf(".action") != -1&& session.getAttribute("LOGIN_SUCCESS") == null) {// 判斷是否為ajax請求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，否則請求會出錯} else {String str = "<script language='javascript'>alert('會話過期,請重新登錄');"+ "window.top.location.href='"+ loginUrl+ "';</script>";response.setContentType("text/html;charset=UTF-8");// 解決中文亂碼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、客戶端JS，用于ajax請求session超時(shí)
對于jquery
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<script type="text/javascript">$(document).ajaxComplete(function(event, xhr, settings) { if(xhr.getResponseHeader("sessionstatus")=="timeOut"){ if(xhr.getResponseHeader("loginPath")){alert("會話過期，請重新登陸!");window.location.replace(xhr.getResponseHeader("loginPath")); }else{ alert("請求超時(shí)請重新登陸 !"); } } }); </script> |
對于extjs的ajax請求
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Ext.Ajax.on('requestcomplete',checkUserSessionStatus, this);function checkUserSessionStatus(conn,response,options){if(response.getResponseHeader("sessionstatus") == 'timeout'){if(response.getResponseHeader("loginPath")){alert("會話過期，請重新登陸!");window.top.location.href = response.getResponseHeader("loginPath");}else{alert("請求超時(shí)請重新登陸 !");}}} |
如果使某個ajax請求不受全局方法的影響，那么可以在使用$.ajax()方法時(shí)，將參數(shù)中的global設(shè)置為false，jquery代碼如下：
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$.ajax({url:"test.html",global:false//不觸發(fā)全局ajax事件}) |
以上所述是小編給大家介紹的Session過期后自動跳轉(zhuǎn)到登錄頁面的實(shí)例代碼，希望對大家有所幫助，如果大家想了解更多內(nèi)容敬請關(guān)注服務(wù)器之家網(wǎng)站！
