el,jstl

 This is my JSP page. <br>
    <%
    String s ="jack";
    session.setAttribute("s",s);
    String[] arr={"东莞","foshan","zhanjiang"};
    session.setAttribute("city",arr);
     %>
     ${empty sessionScope.s}
     ${sessionScope.city[0] }
     <%
     Map map =new HashMap();
     map.put("011","大连");
     map.put("012","四川");
     map.put("013","南宁");
     session.setAttribute("code",map);
    
      %>
      ${sessionScope.code["012"]}
    

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%
List list =new ArrayList();
list.add("jack");
list.add("rose");
list.add("marry");
session.setAttribute("list",list);

 %>
 <c:forEach items="${sessionScope.list}" var="str">${str}</c:forEach>