Ajax请求session过期处理

后端过滤器处理：

// 处理Ajax请求HttpServletResponse response = (HttpServletResponse) arg1;if ("XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"))) {response.setCharacterEncoding("UTF-8");response.getWriter().write("{\"status\": 302, \"msg\": \"请先登录！\"}");} else {response.sendRedirect(request.getContextPath() + "/index.jsp");}

前端处理（Ajax全局设置）：

$.ajaxSetup({    complete: function(r, status) {    var json = JSON.parse(r.responseText);    if(json.status == 302){    top.location.href = "${pageContext.request.contextPath }/";    }    }});