JSTL - 输出未按预期输出

发布于 2024-12-26 11:57:40 字数 907 浏览 1 评论 0原文

下面是我使用 jstl 1.2 在 index.jsp 中的代码。

 <%@ taglib prefix = "c" uri="http://java.sun.com/jstl/core"%>
 <% String[] setName = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
 request.setAttribute("getName", setName);
 %>
 <html>
 <body>
 <table>
 <tr><td>Print</td></tr>
 <c:forEach var="itemName" items="#{getName}" >
 <tr>
 <td>${itemName}</td>
 </tr>
 </c:forEach>
 </table>
 </body>
 </html>

我期望的输出如下

 Print
 Hello
 you
 are
 using
 jstl
 in
 jsp

但是下面是我得到的

  Print
  #{name}

请让我知道我缺少的地方

下面是我在 WEB-INF/lib 文件夹中唯一的 jar 文件 jstl-1.2.jar

先谢谢

Fahim

注意： 添加 Java 和 JSP 标签，因为了解 Java 和 JSP 的人可能会知道 JSTL也...

原文

Below is the code I have in index.jsp using jstl 1.2.

 <%@ taglib prefix = "c" uri="http://java.sun.com/jstl/core"%>
 <% String[] setName = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
 request.setAttribute("getName", setName);
 %>
 <html>
 <body>
 <table>
 <tr><td>Print</td></tr>
 <c:forEach var="itemName" items="#{getName}" >
 <tr>
 <td>${itemName}</td>
 </tr>
 </c:forEach>
 </table>
 </body>
 </html>

The output I was expecting is as below

 Print
 Hello
 you
 are
 using
 jstl
 in
 jsp

However below is what I am getting

  Print
  #{name}

Please let me know where I am missing

Below is the only jar file I have in WEB-INF/lib folder
jstl-1.2.jar

Thanks in advance

Fahim

Note: Adding Java and JSP tag as person who have knowledge of Java and JSP might be knowing JSTL too...

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似梦非梦 2025-01-02 11:57:40

在这里，

<%@ taglib prefix = "c" uri="http://java.sun.com/jstl/core"%>

您指定了错误的 JSTL 标记库 URL。这是针对 JSTL 1.0 的。在 JSTL 1.1 之后，路径中需要有 /jsp。另请参阅 JSTL 1.1 标记库文档。

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

至于代码的（并回复所有抱怨使用 ${} 代替的重复答案），#{} 语法仅在 JSP 中有效目标是 Servlet 2.5 / 2.1 兼容容器，其 web.xml 符合 Servlet 2.5 规范。 Tomcat 6.0 就是此类容器的一个示例。 #{} 确实无法在 Tomcat 5.5 或更早版本等旧容器上的 JSP 标记中工作。

为了清楚起见并避免初学者混淆，最好在 JSP 标记中始终使用 ${}。还最好使用自记录变量名称。

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<% 
    String[] names = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
    request.setAttribute("names", names);
%>
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>JSTL demo</title>
    </head>
    <body>
        <table>
            <tr><td>Print</td></tr>
            <c:forEach items="${names}" var="name">
                <tr><td>${name}</td></tr>
            </c:forEach>
        </table>
    </body>
</html>

另请参阅：

Here,

<%@ taglib prefix = "c" uri="http://java.sun.com/jstl/core"%>

You're specifying the wrong JSTL taglib URL. This one is for JSTL 1.0. After JSTL 1.1 it requires a /jsp in the path. See also the JSTL 1.1 tag library documentation.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

As to the of the code (and to reply on all those duplicate answers complaining to use ${} instead), the #{} syntax will only work inside JSP when you're targeting a Servlet 2.5 / 2.1 compatible container with a web.xml conforming Servlet 2.5 spec. Tomcat 6.0 is an example of such a container. The #{} will indeed not work in JSP tags on older containers such as Tomcat 5.5 or older.

For clarity and to avoid confusion among starters, better use ${} all the time in JSP tags. Also better use self-documenting variable names.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<% 
    String[] names = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
    request.setAttribute("names", names);
%>
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>JSTL demo</title>
    </head>
    <body>
        <table>
            <tr><td>Print</td></tr>
            <c:forEach items="${names}" var="name">
                <tr><td>${name}</td></tr>
            </c:forEach>
        </table>
    </body>
</html>

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 

 "http://www.w3.org/TR/html4/loose.dtd">

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 <% String[] setName = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
 request.setAttribute("getName", setName);
 %>
 <html>
 <body>
 <table>
 <tr><td>Print</td></tr>
 <c:forEach var="itemName" items="#{getName}">
 <tr>
 <td>${itemName}</td>
 </tr>
 </c:forEach>
 </table>
 </body>
 </html>

学习：我正在使用 <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> 而不是 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

Below is the final code I am using and it is running...

Posting so that someone can use it... Might help me tomorrow ;)

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 

 "http://www.w3.org/TR/html4/loose.dtd">

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 <% String[] setName = {"Hello", "you", "are", "using", "jstl", "in", "jsp"};
 request.setAttribute("getName", setName);
 %>
 <html>
 <body>
 <table>
 <tr><td>Print</td></tr>
 <c:forEach var="itemName" items="#{getName}">
 <tr>
 <td>${itemName}</td>
 </tr>
 </c:forEach>
 </table>
 </body>
 </html>

Learning : I was using <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> instead of <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

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