1. IF 문장 기본
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>If with Body</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">
<c:if test="${param.guess=='5'}">You guessed my number!
<br />
<br />
<br />
</c:if>
<c:if test="${param.guess!='5'}">You did not guess my number!
<br />
<br />
<br />
</c:if>
</c:if>
<form method="post">Guess what number I am thinking of?
<input type="text" name="guess" />
<input type="submit" value="Try!" />
<br />
</form>
</body>
</html>
2. if ~ else 문
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>Using Choose,Otherwise and When</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">Ok, we'll
send
<c:out value="${param.enter}" />
<c:choose>
<c:when test="${param.enter=='1'}">pizza.
<br />
</c:when>
<c:otherwise>pizzas.
<br />
</c:otherwise>
</c:choose>
</c:if>
<form method="post">Enter a number between 1 and 5:
<input type="text" name="enter" />
<input type="submit" value="Accept" />
<br />
</form>
</body>
</html>
3. 논리 연산자 And와 Or을 이용한 if
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<html>
<head>
<title>EL Expression Examples</title>
</head>
<body>
<h1>EL Expression Examples</h1>
<h2>Logical Operators</h2>
<c:set var="guess" value="12"/>
<b>Your guess is </b>
<c:out value="${guess}"/>
<br/>
<c:if test="${(guess >= 10) && (guess <= 20)}">
<b>You're in range!</b><br/>
</c:if>
<c:if test="${(guess < 10) || (guess > 20)}">
<b>Try again!</b><br/>
</c:if>
</body>
</html>
4. true 값과 if문의 처리
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<HTML>
<HEAD><TITLE>JSTL 'if' tag</TITLE></HEAD>
<BODY>
<c:if test="true">Hello world!</c:if>
</BODY>
</HTML>
5. 본문이 없이 if구문 처리하는 예제
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>If with NO Body</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">
<c:if test="${param.guess=='5'}" var="result" />
I tested to see if you picked my number, the result was
<c:out value="${result}" />
</c:if>
<form method="post">Guess what number I am thinking of?
<input type="text" name="guess" />
<input type="submit" value="Try!" />
<br />
</form>
</body>
</html>
6. 테스트 결과를 변수에 넣기, 이렇게 해서 결과를 재 사용할 수 있다.
<html>
<head>
<title>Tag Plugin Examples: if</title>
</head>
<body>
<h1>Tag Plugin Examples - <c:if></h1>
<hr>
<font color="#000000"/>
</br>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<h3>Set the test result to a variable</h3>
<c:if test="${1==1}" var="theTruth" scope="session"/>
The result of testing for (1==1) is: ${theTruth}
<h3>Conditionally execute the body</h3>
<c:if test="${2>0}">
It's true that (2>0)!
</c:if>
</body>
</html>
7. 널과 Boolean
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<html>
<head>
<title>EL Expression Examples</title>
</head>
<body>
<h1>EL Expression Examples</h1>
<h2>Boolean and Null Values</h2>
<c:set var="StrVar" value="true"/>
<c:if test="${StrVar}">
equal!
</c:if><br/>
null == null
<c:out value="${null == null}"/>
</body>
</html>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>If with Body</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">
<c:if test="${param.guess=='5'}">You guessed my number!
<br />
<br />
<br />
</c:if>
<c:if test="${param.guess!='5'}">You did not guess my number!
<br />
<br />
<br />
</c:if>
</c:if>
<form method="post">Guess what number I am thinking of?
<input type="text" name="guess" />
<input type="submit" value="Try!" />
<br />
</form>
</body>
</html>
2. if ~ else 문
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>Using Choose,Otherwise and When</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">Ok, we'll
send
<c:out value="${param.enter}" />
<c:choose>
<c:when test="${param.enter=='1'}">pizza.
<br />
</c:when>
<c:otherwise>pizzas.
<br />
</c:otherwise>
</c:choose>
</c:if>
<form method="post">Enter a number between 1 and 5:
<input type="text" name="enter" />
<input type="submit" value="Accept" />
<br />
</form>
</body>
</html>
3. 논리 연산자 And와 Or을 이용한 if
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<html>
<head>
<title>EL Expression Examples</title>
</head>
<body>
<h1>EL Expression Examples</h1>
<h2>Logical Operators</h2>
<c:set var="guess" value="12"/>
<b>Your guess is </b>
<c:out value="${guess}"/>
<br/>
<c:if test="${(guess >= 10) && (guess <= 20)}">
<b>You're in range!</b><br/>
</c:if>
<c:if test="${(guess < 10) || (guess > 20)}">
<b>Try again!</b><br/>
</c:if>
</body>
</html>
4. true 값과 if문의 처리
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<HTML>
<HEAD><TITLE>JSTL 'if' tag</TITLE></HEAD>
<BODY>
<c:if test="true">Hello world!</c:if>
</BODY>
</HTML>
5. 본문이 없이 if구문 처리하는 예제
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>If with NO Body</title>
</head>
<body>
<c:if test="${pageContext.request.method=='POST'}">
<c:if test="${param.guess=='5'}" var="result" />
I tested to see if you picked my number, the result was
<c:out value="${result}" />
</c:if>
<form method="post">Guess what number I am thinking of?
<input type="text" name="guess" />
<input type="submit" value="Try!" />
<br />
</form>
</body>
</html>
6. 테스트 결과를 변수에 넣기, 이렇게 해서 결과를 재 사용할 수 있다.
<html>
<head>
<title>Tag Plugin Examples: if</title>
</head>
<body>
<h1>Tag Plugin Examples - <c:if></h1>
<hr>
<font color="#000000"/>
</br>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<h3>Set the test result to a variable</h3>
<c:if test="${1==1}" var="theTruth" scope="session"/>
The result of testing for (1==1) is: ${theTruth}
<h3>Conditionally execute the body</h3>
<c:if test="${2>0}">
It's true that (2>0)!
</c:if>
</body>
</html>
7. 널과 Boolean
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<html>
<head>
<title>EL Expression Examples</title>
</head>
<body>
<h1>EL Expression Examples</h1>
<h2>Boolean and Null Values</h2>
<c:set var="StrVar" value="true"/>
<c:if test="${StrVar}">
equal!
</c:if><br/>
null == null
<c:out value="${null == null}"/>
</body>
</html>
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