📄 c_set2.jsp

📁 《精通JSP编程》源代码(赵强那本) 很有用的源代码

💻 JSP

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<%@ page contentType="text/html;charset=GB2312" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
  <title> Core_set_remove</title>
</head>
<body>

<h2><c:out value="<c:set>和<c:remove> 的用法" /></h2>

<c:set scope="page" var="number">
<c:out value="${1+1}"/>
</c:set>

<c:set scope="request" var="number">
<%= 3 %>
</c:set>

<c:set scope="session" var="number">
4
</c:set>

初始设置
<table border="1" width="30%">
<tr>
  <th>pageScope.number</th>
  <td><c:out value="${pageScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>requestScope.number</th>
  <td><c:out value="${requestScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>sessionScope.number</th>
  <td><c:out value="${sessionScope.number}" default="No Data" /></td>
</tr>
</table></br>

<c:out value='<c:remove var="number" scope="page" />之后'/>
<c:remove var="number" scope="page" />
<table border="1" width="30%">
<tr>
  <th>pageScope.number</th>
  <td><c:out value="${pageScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>requestScope.number</th>
  <td><c:out value="${requestScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>sessionScope.number</th>
  <td><c:out value="${sessionScope.number}" default="No Data" /></td>
</tr>
</table></br>

<c:out value='<c:remove var="number" />之后'/>
<c:remove var="number" />
<table border="1" width="30%">
<tr>
  <th>pageScope.number</th>
  <td><c:out value="${pageScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>requestScope.number</th>
  <td><c:out value="${requestScope.number}" default="No Data" /></td>
</tr>
<tr>
  <th>sessionScope.number</th>
  <td><c:out value="${sessionScope.number}" default="No Data" /></td>
</tr>
</table>
</body>
</html>

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