如何在JSTL if语句中执行按位逻辑? [英] How do I perform bitwise logic within JSTL if statements?

问题描述

我需要在JSP中执行按位测试，但是我一生都无法弄清楚如何使用EL进行测试.

I have a need to perform a bitwise test within a JSP but can't for the life of me figure out how to do it with EL.

我想做类似的事情:

<c:if test="${(test & testFor) == testFor}">
  <h3>Test Passed</h3>
</c:if>

我当然可以使用普通的JSP语法做到这一点:

Of course I can do it with ordinary JSP syntax:

<% if ((test & testFor) == testFor) { %>
  <h3>Test Passed</h3>
<% } %>

推荐答案

我认为JSTL中未实现按位运算符(

I think bitwise operators are not implemented in JSTL (see here)

您可以实现名为bitwiseAnd(int, int)的JSTL函数，并以Java代码执行按位测试

You can implement a JSTL function, called bitwiseAnd(int, int) and perform the bitwise test in Java code

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