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WebContent에 jstl이라는 폴더 만들고 adder.jsp 복사 붙여넣기. action에 addResult_jstl 로 변경
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jstl 라이브러리 다운받기
https://mvnrepository.com/artifact/javax.servlet/jstl/1.2 에서 jar 파일 다운로드, WEB-INF에 넣기
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adder.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>
<body>
<form action="addResult_jstl.jsp">
첫번째 수 : <input type="text" name="num1"><br>
두번째 수 : <input type="text" name="num2"><br>
<input type="submit" value="더하기">
</form>
</body>
</html>-
addResult_jstl.jsp
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set: 변수 지정 키워드
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choose & when: 조건문
<%@ 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>
첫번째: ${param.num1}<br/>
첫번째: ${param.num2}<br/>
<hr/>
결과: ${param.num1+param.num2}<br/>
<c:set var="no" value="${param.num1}"/>
no: ${no }
<hr/>
<c:choose>
<c:when test="${no mod 2==0}">
짝수
</c:when>
<c:otherwise>
홀수
</c:otherwise>
</c:choose>
<hr>
<c:if test="${no%2==0 }">
짝수
</c:if>
<c:if test="${no%2!=0 }">
홀수
</c:if>
</body>
</html>
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color.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>
<body>
<form action="colorResult.jsp">
ID:<input type="text" name="id"><br>
Color:
<select name="color">
<option value="yellow">노랑</option>
<option value="blue">blue</option>
<option value="orange">orange</option>
<option value="pink">pink</option>
</select>
<input type="submit" value="보내기">
</form>
</body>
</html>
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colorResult.jsp:출력값 (choose를 써야 when을 쓸 수 있음)
<%@ 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>
<c:if test="${param.id!=null}">
<c:set var="id" value="${param.id }"/>
</c:if>
<c:if test="${param.id==null || param.id==''}">
<c:set var="id" value="GUEST"/>
</c:if>
color:${param.color} <br>
<c:choose>
<c:when test="${param.color=='yellow'}">
<c:set var="c" value="노랑"/>
</c:when>
<c:when test="${param.color=='blue'}">
<c:set var="c" value="파랑"/>
</c:when>
<c:when test="${param.color=='pink'}">
<c:set var="c" value="분홍"/>
</c:when>
<c:when test="${param.color=='orange'}">
<c:set var="c" value="주황"/>
</c:when>
</c:choose>
${id}님이 좋아하는 색깔은
<span style="background-color: ${param.color}">${c}</span>입니다.
</body>
</html>
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