Java 用 JSTL 比较字符串
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Comparing strings with JSTL
提问by Moon13
I have two strings that i need to compare, but even if they have the same values or different , it alwaysenters the statement...
我有两个需要比较的字符串，但即使它们具有相同或不同的值，它也总是进入语句...
<c:when test="#{bean.name1 != bean.name2}">
fields that are supposed to appear _only_ when name1 is different from name2
</c:when>
采纳答案by John Vint
The problem is that you probably did not wrap the when in a choose tag.
问题是您可能没有将 when 包装在选择标签中。
if you have:
如果你有：
<c:choose>
<c:when test="${bean.name1 != bean.name2}">
fields that are supposed to appear _only_ when name1 is different from name2
</c:when>
</c:choose>
It will work
它会工作
回答by Zinc
Try this...
尝试这个...
<c:if test="${bean.name1 ne bean.name2}">
fields that are supposed to appear _only_ when name1 is different from name2
</c:if>
ne = not equal
ne = 不相等
Also
还
# should be $
# 应该是 $
回答by fastcodejava
Should it be fields that are supposed to appear onlywhen name1 is different from name2
是否应该是仅在 name1 与 name2 不同 时才出现的字段
回答by fastcodejava
Should it be ?
应该是吗？
<c:if test="#{bean.name1 != bean.name2}">
// code
</c:if>
EDIT : <c:when>is supposed to be inside <c:choose>. Cannot ask why, that is just the syntax. It is like asking why ifwill not work in place of switchin C/C++/Java. They are just different animals.
编辑： <c:when>应该在里面<c:choose>。不能问为什么，这只是语法。这就像问为什么if不能代替switchC/C++/Java 一样工作。他们只是不同的动物。
回答by u7867
Does it make any difference if you do this:
如果你这样做有什么区别吗：
<c:when test="${bean.name1 != bean.name2}">
fields that are supposed to appear _only_ when name1 is different from name2
</c:when>
回答by GreenieMeanie
I have noticed some flakiness when using c:if or c:choose and c:when inside some jsf iteration components, such as rich:datatable. What is the full context?
我注意到在某些 jsf 迭代组件（例如 Rich:datatable）中使用 c:if 或 c:choose 和 c:when 时有些不稳定。完整的上下文是什么？
As a workaround, I would commonly have to wrap things in an a4j:outputPanel and set the rendered attribute accordingly.
作为一种解决方法，我通常必须将内容包装在 a4j:outputPanel 中并相应地设置呈现的属性。
