JSP:不计算 EL 表达式 [英] JSP: EL expression is not evaluated

问题描述

我有一个在 Tomcat 5.5 上运行的 JSP 页面.我有以下代码:

I have a JSP page running on Tomcat 5.5. I have the following code:

 <c:forEach var="i" begin="1" end="10" step="1">
  <c:out value="${i}" />
  <br />
</c:forEach>

我得到的输出是:

${i} 
${i} 
${i} 
${i} 
${i} 
${i} 
${i} 
${i} 
${i} 
${i} 

我不知道为什么 forEach 循环有效但输出无效.任何人可以提供的任何帮助都会很棒.

I cant work out why the forEach loop is working but the output is not working. Any help any one could give would be great.

推荐答案

我知道它应该在默认情况下打开，但我时不时地跨页面(甚至是改变行为的同一页面)运行 EL 处理不不会发生将以下内容添加到任何此类页面的顶部应该可以解决问题:

I know it's supposed to be on by default, but I run across pages now and again (or even the same page that changes behavior) where the EL processing doesn't happen. Adding the following to the top of any such pages should resolve the issue:

<%@ page isELIgnored="false" %> 

我把它添加到每个页面，因为它不会受到伤害，但我仍然不知道偶尔导致页面停止解释 EL 表达式的根本原因.

I add it to every page because it doesn't hurt, and I still don't know the root cause that occasionally causes a page to stop interpreting the EL expressions.

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