Java/JSTL/Collections
Версия от 18:01, 31 мая 2010; (обсуждение)
JSTL Iteration over tokens
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>Updatable Collections</title>
</head>
<body>
<table border="0">
<form method="post">
<tr bgcolor="blue">
<td>
<p align="center">
<b>
<font color="#FFFFFF">Parse for Tokens</font>
</b>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p align="left">Enter a sentence:
<br />
<input width="20" maxwidth="20" name="text"
size="50" />
<br />
 </p>
</td>
</tr>
<tr>
<td valign="top">
<p align="center">
<input type="submit" name="parse" value="Parse" />
</p>
</td>
</tr>
</form>
</table>
<c:if test="${pageContext.request.method=="POST"}">
<table border="1">
<c:set var="i" value="1" />
<c:forTokens items="${param.text}" var="word"
delims=" ,.?!">
<c:set var="i" value="${i}" />
<tr>
<td>
<b>Word
<c:out value="${i}" />
</b>
</td>
<td>
<c:out value="${word}" />
</td>
</tr>
</c:forTokens>
</table>
</c:if>
</body>
</html>
JSTL Modify a collection
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<c:if test="${pageContext.request.method=="POST"}">
<c:choose>
<c:when test="${param.add!=null}">
<c:if test="${list!=null}">
<c:set var="list" value="${list}," scope="session" />
</c:if>
<c:set var="list" value="${list}${param.item}"
scope="session" />
</c:when>
<c:when test="${param.remove!=null}">
<c:set var="list2" value="" />
<c:forEach var="item" items="${list}">
<c:if test="${item!=param.item}">
<c:if test="${list2!=""}">
<c:set var="list2" value="${list2}," />
</c:if>
<c:set var="list2" value="${list2}${item}" />
</c:if>
</c:forEach>
<c:set var="list" value="${list2}" scope="session" />
<c:remove var="list2" />
</c:when>
</c:choose>
</c:if>
<html>
<head>
<title>Updatable Collections</title>
</head>
<body>
<table border="0">
<form method="post">
<tr bgcolor="blue">
<td colspan="2">
<font color="white">Updatable Collections</font>
</td>
</tr>
<tr>
<td valign="top">
<select NAME="choice" SIZE="5" width="20">
<c:forEach var="item" items="${list}">
<option>
<c:out value="${item}" />
</option>
</c:forEach>
</select>
</td>
<td valign="top">Enter a item to add or remove.
<br />
<input width="20" maxwidth="20" name="item" size="20" />
<br />
<input type="submit" name="add" value="Add" />
<input type="submit" name="remove" value="Remove" />
</td>
</tr>
</form>
</table>
</body>
</html>
String Collection Examples
<%@ taglib uri="http://java.sun.ru/jstl/core" prefix="c" %>
<html>
<head>
<title>String Collection Examples</title>
</head>
<body>
<h3>String Collection Example</h3>
<c:set var="str"
value="Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday" />
<b>Input String:</b>
<br />
<br />
<c:out value="${str}" />
<br />
<br />
<b>Iterating:</b>
<br />
<br />
<c:forEach var="day" items="${str}">
<c:out value="${day}" />
<br />
</c:forEach>
</body>
</html>
