데이터 구조 별로 View에서 EL 이용해서 값 뽑는 방법
1) Number
Controller
request.setAttribute("cnt", 30)
View
request.getAttribute("cnt")
View - EL
${cnt}
2) List
Controller
List list = new ArrayList(){"1", "test", ...};
request.setAttribute("list", list);
View
((List)request.getAttribute("list").get(0))
View - EL
${list[0]}
3) Map
Controller
Map n = new HashMap("title", "제목");
request.setAttribute("n", n);
View
((Map)request.getAttribute("n")).get("title")
View - EL
${n.title}
EL 저장소
spag.java
package com.youngenie.web;
import ...
@WebServlet("/spag")
public class Spag extends HttpServlet{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int num = 0;
String num_ = request.getParameter("n");
if(num_ != null && !num_.equals(""))
num = Integer.parseInt(num_);
String result;
if(num%2 != 0)
result = "홀수";
else
result = "짝수";
request.setAttribute("result", result);
String[] names = {"david", "dragon"};
request.setAttribute("names", names);
Map<String, Object> notice = new HashMap<String, Object>();
notice.put("id", 1);
notice.put("title", "EL is good");
request.setAttribute("notice", notice);
//forward
RequestDispatcher dispatcher = request.getRequestDispatcher("spag.jsp");
dispatcher.forward(request, response);
}
}spag.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!-- -------------------------------------------------- -->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<%
pageContext.setAttribute("result", "hello");
%>
<body>
<%=request.getAttribute("result") %>입니다.
${requestScope.result}<br >
<br >
${names[0]}
<br >
${notice.id}
${notice.title}
${result}
${param.n}
${header.accept}
</body>
</html>
yozzum