filter 攔截ajax請求

1.filter
public class SessonFilter implements Filter { private static Logger log = LoggerFactory.getLogger(SessonFilter.class); @Override public void init(FilterConfig filterConfig) throws ServletException { //empty implement } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; HttpSession session = httpRequest.getSession(); String uri = httpRequest.getRequestURI(); String ctxpath = httpRequest.getContextPath(); String userid = (String)session.getAttribute("userid"); if(uri.contains("/user/login") || uri.contains("/user/regPage") ){ chain.doFilter(request, response); }else{ if(userid == null){ String contextPath = httpRequest.getContextPath(); String redirect = contextPath ; //ajax session 過時處理 //1:判斷是不是ajax請求 if (httpRequest.getHeader("x-requested-with") != null && "XMLHttpRequest".equalsIgnoreCase(httpRequest.getHeader("x-requested-with"))) { //向http頭添加 狀態 sessionstatus httpResponse.setHeader("sessionstatus","timeout"); httpResponse.setStatus(403); //向http頭添加登陸的url httpResponse.addHeader("loginPath", ctxpath); chain.doFilter(request, response); log.debug("ajax request"); return ; } httpResponse.sendRedirect(redirect); return; }else{ chain.doFilter(request, response); } } } @Override public void destroy() { //empty implement } }

2.核心代碼

//ajax session 過時處理 //1:判斷是不是ajax請求 if (httpRequest.getHeader("x-requested-with") != null && "XMLHttpRequest".equalsIgnoreCase(httpRequest.getHeader("x-requested-with"))) { //向http頭添加 狀態 sessionstatus httpResponse.setHeader("sessionstatus","timeout"); httpResponse.setStatus(403); //向http頭添加登陸的url httpResponse.addHeader("loginPath", ctxpath); chain.doFilter(request, response); log.debug("ajax request"); return ; }

3.JS

//ajax完成時回調函數 $(document).ajaxComplete(function(event, xhr, settings) { //從http頭信息取出 在filter定義的sessionstatus，判斷是不是 timeout if(xhr.getResponseHeader("sessionstatus")=="timeout"){ //從http頭信息取出登陸的url ＝ loginPath if(xhr.getResponseHeader("loginPath")){ alert("會話過時，請從新登錄!"); //打會到登陸頁面 window.location.replace(xhr.getResponseHeader("loginPath")); }else{ alert("請求超時請從新登錄 !"); } } });