<%@page import="org.apache.jasper.tagplugins.jstl.core.ForEach"%>
<%@page import="java.util.Map"%>
<%@page import="java.util.HashMap"%>
<%@page import="java.util.ArrayList"%>
<%@page import="dto.MemberDto"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!--
EL: 표현식(값, 판별)
Core: 제어문(for, if) -> EL tag와 같이 사용한다
-->
<%
request.setAttribute("data", "JSTL입니다"); // set
%>
${ data }
<br>
<%
String cdata = "core JSTL입니다";
request.setAttribute("data", cdata);
%>
<!-- 위와 같다 -->
<!-- set -->
<c:set var="cdata" value="core JSTL입니다" />
${ cdata }
<br>
<br>
<!-- out(내장객체_ -->
<%
out.println(cdata);
%>
<%
session.setAttribute("sessionData", "저장된 데이터");
%>
<c:set var="sdate" value="${sessionData}"></c:set>
<c:out value="${ sdate }" />
<br>
<br>
<!-- if -->
<%
request.setAttribute("count", "10");
%>
<%
String sCount = (String) request.getAttribute("count");
int count = Integer.parseInt(sCount);
if (count >= 10) {
%>
<p>
count:<%=count%></p>
<%
}
%>
<!-- 위와 아래는 완전히 같다 -->
<c:if test="${count >= 10}">
<p>
core count:
<c:out value="${count}" />
</p>
</c:if>
<br>
<br>
<%
request.setAttribute("name", "홍길동");
%>
<c:if test="${ name eq '홍길동' }">
<p>제이름은 홍길동이 맞습니다</p>
</c:if>
<br>
<br>
<%
request.setAttribute("name", "일지매");
%>
<c:if test="${ name eq '일지매' }" var="flg" />
<c:if test="${flg }">
<p>이름은 일지매입니다</p>
</c:if>
<!-- for -->
<%
for (int i = 0; i < 10; i++) {
%>
<%=i%>
<%
}
%>
<br>
<c:forEach begin="0" end="9" step="1" varStatus="i">
<c:out value="${i.index }"></c:out>
</c:forEach>
<br>
<br>
<%
List<MemberDto> list = new ArrayList<>();
MemberDto mem = new MemberDto();
mem.setMessage("하이");
list.add(mem);
mem = new MemberDto();
mem.setMessage("안녕");
;
list.add(mem);
mem = new MemberDto();
mem.setMessage("건강히");
list.add(mem);
request.setAttribute("list", list);
%>
<%-- <%
for(int i = 0; i< list.size(); i++){
MemberDto m = list.get(i);
}
for(MemberDto m : list){
}
%> --%>
<!-- 끝의길이를 적어주지 않아도 된다 -->
<c:forEach begin="0" end="2" var="m" items="${list }" varStatus="i">
<p>
index:
<c:out value="${i.index }" />
</p>
<p>
data:
<c:out value="${m.message }"></c:out>
</p>
</c:forEach>
<!-- Map -->
<%
Map<String, String> map = new HashMap<>();
map.put("apple", "사과");
map.put("pear", "배");
map.put("banana", "바나나");
request.setAttribute("map", map);
%>
<c:forEach var="obj" items="${map }">
key:<c:out value="${obj.key }"></c:out>
value:<c:out value="${obj.value }"></c:out>
</c:forEach>
</body>
</html>
Java/java 기초
