今天客户说服务器重启日志就有空指针错误，经研究是session过期而客户前台界面未刷新继续发送ajax请求导致，ajax走fiter session为空时不会重定向，解决思路filter继续返回错误界面，easyui datagrid onLoadError做判断
filter代码，很粗糙
@H_
404_7@if (hRequest.getSession().getAttribute(SOperationResource.SESSION_USER) == null) {
PrintWriter out = hResponse.getWriter();
out.println("<html>");
out.println("<script>");
out.println("window.open('" + request.getServletContext().getContextPath() + "/index.html','_top');");
out.println("</script>");
out.println("</html>");
return;
}
@H_
404_7@datagrid端：onLoadError:function(data){
if(data.responseText.toString().indexOf("账户")){
location.href="../index.html"
}
},
