Session超时后，Ajax请求处理方式

传统的基于B/S的应用中，Session会话超时后通常是跳转到应用的首页，但Ajax请求的处理方式有些不同，下面简单介绍一下Ajax请求的Session超时处理(超时后返回首页)

1.首先创建一个Filter

import java.io.IOException;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;public class AjaxSessionTimeoutFilter implements Filter {public void destroy() {}public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) request;HttpServletResponse res = (HttpServletResponse) response;// 判断session里是否有用户信息if (req.getSession().getAttribute("SPRING_SECURITY_CONTEXT") == null){// 如果是ajax请求响应头会有，x-requested-with；if (req.getHeader("x-requested-with") != null && req.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")){res.setStatus(911);//表示session timeout}else{chain.doFilter(req, res);}}else{chain.doFilter(req, res);}}public void init(FilterConfig chain) throws ServletException {}}

2.在web.xml中增加以下配置

<filter><filter-name>ajaxSessionTimeout</filter-name><filter-class>org.tshark.framework.web.filter.AjaxSessionTimeoutFilter</filter-class></filter><filter-mapping><filter-name>ajaxSessionTimeout</filter-name><url-pattern>/*</url-pattern></filter-mapping>

3.设置Ajax调用全局参数

$.ajaxSetup({contentType : "application/x-www-form-urlencoded;charset=utf-8",complete : function(xhr, textStatus) {$.ts.hideLoading();//session timeoutif (xhr.status == 911) {window.location = rootPath + "/";//返回应用首页return;}}});