This article mainly introduces the example code of rewriting ajax to implement session timeout to jump to the login page. Friends who need it can refer to the following
Question: When using window.location.href to jump to the page, The backend only needs to implement a filter to redirect to the login page if the session times out. But what about using ajax? Using ajax to execute will result in a 302 error and it is impossible to jump to the page. Below I will post my front-end and back-end code to address this issue.
1. Session filter
import java.io.IOException; <p style="text-align: center"><img alt=""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; <p style="text-align: center"><img alt=""public class SessionFilter implements Filter { <p style="text-align: center"><img alt="" public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; <p style="text-align: center"><img alt="" String requestUri = request.getRequestURI(); <p style="text-align: center"><img alt="" if (requestUri.indexOf("/login.html") > 0 || requestUri.indexOf("/system/login") > 0) { return ; } <p style="text-align: center"><img alt="" HttpSession session = request.getSession(false); <p style="text-align: center"><img alt="" if (session == null) { // 如果是session超时,在此处做处理。 response.sendRedirect(request.getContextPath() + "/login.html"); return ; } try { filterChain.doFilter(request, response); } catch (Exception e) { e.printStackTrace(); } return ; } }
2. Add configuration to web.xml:
<filter> <filter-name>sessionFilter</filter-name> <filter-class>com.manager.filter.SessionFilter</filter-class> </filter> <filter-mapping> <filter-name>sessionFilter</filter-name> <url-pattern>/manager/*</url-pattern> </filter-mapping>
*3 , Rewrite ajax
Note: This code is placed on the index page
jQuery(function($){ var _ajax=$.ajax; $.ajax=function(opt){ var _success = opt && opt.success || function(a, b){}; var _opt = $.extend(opt, { success:function(data, textStatus){ _success(data, textStatus); }, error:function(XMLHttpRequest, textStatus, errorThrown){ //alert(XMLHttpRequest.responseText); //如果请求发生错误,会返回登陆页面源代码,如果源代码里面存在lovnx这个字符串,前端就重定向到登陆页面 var reData = XMLHttpRequest.responseText + ""; if(reData.indexOf('lovnx') != -1) { window.location.href="/manager/login.html" rel="external nofollow" ; return; } } }); return _ajax(_opt); }; });
4. Add code to the login page
<input type="hidden" value="lovnx">
The above is I compiled it for everyone, I hope it will be helpful to everyone in the future.
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