$.ajaxSetup({contentType : "application/x-www-form-urlencoded;charset=utf-8",complete : function(xhr, textStatus) {if (xhr.status == 520) {//如果返回狀態碼是520window.location..reload();//刷新頁面，執行登錄邏輯return;}} });

java代碼：

　　1. 寫一個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 SessionTimeoutFilter 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;// 判斷session里是否有用戶信息if (req.getSession().getAttribute("username") == null){// 如果是ajax請求響應頭會有，x-requested-with；if (req.getHeader("x-requested-with") != null && req.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")){res.setStatus(520);//表示session timeout}else{chain.doFilter(req, res);}}else{chain.doFilter(req, res);}}public void init(FilterConfig chain) throws ServletException {} }

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轉載地址：?https://www.cnblogs.com/cxyj/p/3884964.html

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