705
No
EL
ex01.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%-- EL(Expression Language) ${변수 } or ${식 } --%>
${2+5 } <br>
${4/5 } <br><!-- 몫 -->
${7 mod 5 } <br> <!-- 나머지 -->
${2 < 3 }<br>
${3.1 le 3.2 } <br> <!-- less 작다 true false 결과 true -->
${ 3 gt 2 } <br><!-- 크다 true false 결과 true -->
${(5 > 3) ? 5: 3 } <br> <!-- 삼항연산자 -->
</body>
</html>
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7
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ex02.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<!-- action 이 생략되면 현재 페이지로 값을 보냄
method 생략 => get 방식
-->
<form method="get">
이름 <input name="name">
<input type="submit" value="확인">
</form>
<%
String name=request.getParameter("name");
if(name==null)name="";
%>
이름 : <%= name %> <br>
이름 : ${param.name }
</body>
</html>
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이름 :
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ex03.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<form method="post" action="ex03_result.jsp">
숫자 <input type="number" name="num">
<input type="submit" value="확인">
</form>
</body>
</html>
ex03_result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%
int num=0;
if(request.getParameter("num")!=null){
num =Integer.valueOf(request.getParameter("num"));
int sum=0;
for(int i=1; i<=num; i++){
sum +=i;
}
%>
합계 : <%= sum %> <br>
<%
}else{
out.print("ex03.jsp 에서 실행하세요");
}
%>
<hr>
<!-- EL은 단독으로 사용되기보다는 JSTL 과 함께 사용됨 -->
<!-- set var="변수명" value="값" -->
<c:set var="sum" value="0" />
<!-- forEach var="루프변수" begin="시작" end="끝" -->
<c:forEach var="i" begin="1" end="${param.num }">
<c:set var="sum" value="${sum +i }" />
</c:forEach>
합계 : ${sum }
</body>
</html>
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숫자
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합계 : 5050 합계 : 5050
|
ex04.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<h2>EL 세션변수</h2>
<!--
scope : page, request, session, application
기본값은 page
-->
<%
//session.setAttribute("name", "김철수");
//session.getAttribute("name")
//${sessionScope.name}
%>
<c:set var="name" value="김철수" scope="session" />
<c:set var="age" value="20" scope="session" />
<c:set var="job" value="dba" scope="session" />
세션변수가 저장되었습니다. <br>
<a href="ex04_result.jsp">확인</a>
</body>
</html>
ex04_result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
이름 : ${sessionScope.name } <br>
나이 : ${sessionScope.age } <br>
직업 : ${sessionScope.job }<br>
<hr>
${name }<br>
${age }<br>
${job } <br>
</body>
</html>
EL 세션변수세션변수가 저장되었습니다.
|
|
이름 : 김철수 김철수
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ex05.jsp
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%
ArrayList<String> items=new ArrayList<>();
items.add("오렌지");
items.add("사과");
items.add("포도");
items.add("복숭아");
// request.setAttribute("items", items);
%>
<c:set var="items" value="<%=items %>" scope="request" />
<jsp:forward page="ex05_result.jsp" />
</body>
</html>
ex05_result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<!-- forEach var="루프변수" begin="시작" end="끝"
forEach var="개별값" items="집합" -->
<c:forEach var="fruit" items="${items}" >
${fruit}<br>
</c:forEach>
</body>
</html>
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오렌지
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ex06.jsp
<%@page import="java.util.HashMap"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%
HashMap<String, String> map =new HashMap<>();
map.put("포도", "grape");
map.put("오렌지", "orange");
map.put("바나나", "banana");
map.put("사과", "apple");
%>
<c:set var="map" value="<%= map %>" scope="request" />
<jsp:forward page="ex06_result.jsp" />
</body>
</html>
ex06_result.jsp
<%@page import="java.util.HashMap"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%-- ${맵.변수 } or ${ 맵["변수"] } --%>
<%-- ${map.포도 }<br> 한글변수명을 사용하면 에러 --%>
${map["포도"] }<br>
${map["오렌지"] }<br>
${map["바나나"] }<br>
${map["사과"] }<br>
<hr>
<%
HashMap<String, String> map =(HashMap<String,String>)request.getAttribute("map");
out.println(map.get("포도") +"<br>");
out.println(map.get("오렌지") +"<br>");
out.println(map.get("바나나") +"<br>");
out.println(map.get("사과") +"<br>");
%>
</body>
</html>
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grape grape
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ex07.jsp
<%@page import="member.MemberDTO"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<%
MemberDTO dto =new MemberDTO();
dto.setUserid("kim");
dto.setPasswd("1234");
dto.setName("홍길동");
%>
<c:set var="dto" value="<%= dto %>" scope="request" />
<jsp:forward page="ex07_result.jsp" ></jsp:forward>
</body>
</html>
ex07_result.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
<!--
request 영역의 변수는
requestScope.변수에서 requestScope 생략
dto.userid => getUserid() 가 호출됨
-->
아이디 : ${ requestScope.dto.userid} <br>
비번 : ${ dto.passwd }<br>
이름 : ${ dto.name }<br>
</body>
</html>
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아이디 : kim
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