<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ page import="com.runzhixing.constant.Constant" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> My JSP 'common.jsp' starting page <% String un = (String)session.getAttribute(Constant.userName); if(un==null||un==""){ response.sendRedirect(basePath+"jsp/login/loginType.jsp"); return; } %>