★ jstl 실습
Model2 라는 프로젝트를 만들어 준다(jstl을 실습할 것이므로 jstl 폴더만 만들어준다).
1. eltest.jsp
바디
<%
session.setAttribute("test", "Session Test");
%>
<form action="eltest2.jsp" method="post">
이름:<input type="text" name="name" value="홍길동">
<input type="submit" value="전송">
</form>
2. eltest2.jsp
바디
<%
request.setCharacterEncoding("utf-8");
%>
<!-- 세션값 출력 가능 -->
<h3>${sessionScope.test }</h3>
<!-- 이름이 name인 input태그 파라미터값을 가져옴 -->
<h3>${param.name }</h3>
<h3>\${10%3 }= ${10%3 }</h3>
<h3>\${5!=7 }= ${5!=7 }</h3>
3. jstlcore.jsp
<!-- 태그 라이브러리 설치 -->
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
바디
<c:set var="test" value="Hello jstl"/>
<h3>변수값 출력:<c:out value="${test }"/></h3>
<h3>삭제후 변수값 출력:<c:remove var="test"/></h3>
<c:catch var="err">
<%=10/0 %>
</c:catch>
<h3>오류:<c:out value="${err }"/></h3>
<c:if test="${5<10 }">
<h3>5는 10보다 작다</h3>
</c:if>
<c:choose>
<c:when test="${5+10==50 }">
<h3>5+10은 50이다</h3>
</c:when>
<c:otherwise>
<h3>5+10은 50이 아니다</h3>
</c:otherwise>
</c:choose>
4. jstlcore2.jsp
태그 라이브러리
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
바디
<c:forEach var="test" begin="1" end="10" step="2">
<b>${test }</b>
</c:forEach>
<br>
<c:forTokens var="alphabet" items="a,b,c,d,e,f,g,h" delims=",">
<b>${alphabet }</b>
</c:forTokens>
<br>
<c:set var="data" value="홍길동,이길동,김길동" />
<c:forTokens var="name" items="${data }" delims=",">
<b>${name }</b>
</c:forTokens>
5. jstlfmt.jsp
태그 라이브러리
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
바디
<fmt:setLocale value="en_US"/>
<fmt:formatNumber value="50000" type="currency"/><br>
<fmt:formatNumber value="0.15" type="percent"/><br>
<fmt:formatNumber value="500567300" pattern="###,###,###"/><br><br>
<jsp:useBean id="date" class="java.util.Date"/>
<fmt:formatDate value="${date }" type="date" /><br>
<fmt:formatDate value="${date }" type="time" /><br>
<fmt:formatDate value="${date }" type="both" /><br>
<fmt:formatDate value="${date }" type="both" timeStyle="short" dateStyle="short"/><br>
<fmt:formatDate value="${date }" type="both" timeStyle="long" dateStyle="long"/><br>
6. jstlsql.jsp
태그 라이브러리
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
바디
<sql:setDataSource var="con"
driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/jspbeginner"
user="jspid"
password="jsppass"/>
<sql:update dataSource="${con }">
insert into test(num,name) values(1,'홍길동')
</sql:update>
<sql:update dataSource="${con }">
insert into test(num,name) values(2,'김길동')
</sql:update>
<sql:update dataSource="${con }">
insert into test(num,name) values(3,'홍길순')
</sql:update>
<sql:update dataSource="${con }">
insert into test(num,name) values(4,'김길순')
</sql:update>
<sql:query var="rs" dataSource="${con }">
select *from test where name=?
<sql:param>홍길동</sql:param>
</sql:query>
<c:forEach var="data" items="${rs.rows }">
<c:out value="${data['num'] }"/>
<c:out value="${data['name'] }"/>
<br>
</c:forEach>
7. jstlxml.jsp
태그 라이브러리
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
바디
<x:parse var="xmldata">
<students>
<student>
<name>김광천</name>
<age>28</age>
<gender>남</gender>
<phone>010-111-1111</phone>
</student>
<student>
<name>김길동</name>
<age>19</age>
<gender>남</gender>
<phone>010-111-1111</phone>
</student>
<student>
<name>김길순</name>
<age>25</age>
<gender>여</gender>
<phone>없음</phone>
</student>
<student>
<name>홍길순</name>
<age>10</age>
<gender>여</gender>
<phone>없음</phone>
</student>
</students>
</x:parse>
<x:forEach select="$xmldata//student">
<x:if select="./name!='홍길순'">
<x:out select="./name"/>
<x:out select="./age"/>
<x:out select="./gender"/>
<x:choose>
<x:when select="./phone!='없음'">
[전화번호:<x:out select="./phone"/>]
</x:when>
<x:otherwise>
[전화 없음]
</x:otherwise>
</x:choose>
<br>
</x:if>
</x:forEach>
★ 첨부
- jar 파일
jstl.jar