${form.test} 打印“var”，但 ${form.test== 'var'} 始终为 false
当我尝试在 JSP 中打印一个值时，它打印名为 "var" 的值，但是当我尝试在 if 条件中使用相同的值时，它似乎不起作用。请有人帮助我...:(:(
<c:out value="${form.test}" /> /* for printing and it's printing "var"*/
<c:if test="${form.test== 'var'}"> /* for if condition which is not working */
when I tried to print a value in JSP, it's printing the value which is named "var" but when I tried to use the same value in a if condition it doesn't seem to be working. Please somebody help me...:(:(
<c:out value="${form.test}" /> /* for printing and it's printing "var"*/
<c:if test="${form.test== 'var'}"> /* for if condition which is not working */
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它应该可以正常工作，假设这些双引号不是值的一部分（即您看到的是
var，而不是"var"）。也许该值周围有一些悬空的空白？您可以通过以下方式调试其中一种或另一种：
它
确实是空格并且您无法在 servlet/SQL 端修剪它，请考虑使用
fn:trim()：如果 “http://download.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fn/tld-summary.html”rel="nofollow">JSTL 函数 标签库可以通过以下方式获得：以下标记库声明：
It should work fine, assuming that those doublequotes are not part of the value (i.e. you're seeing
var, not"var"). Perhaps there's some dangling whitespace around the value?You could debug the one and other the following ways:
and
If it is indeed the whitespace and you cannot trim it in the servlet/SQL end, consider using
fn:trim():The JSTL functions taglibrary is by the way available by the following taglib declaration:
尝试：
Try: