JSTL日期比较

Question

I've seen some posts about date comparisons in JSTL, but I still can't get it to work. 我在JSTL上看过一些关于日期比较的帖子，但我仍然无法让它发挥作用。

I have a date field, which I want to test whether is after 01-01-1970 . 我有一个日期字段，我想测试是否在01-01-1970之后。

<c:if test="${user.BirthDate > whatGoesHere}">
    <doSomeLogic/>
</c:if>

Maybe a bean should be used? 也许应该使用豆子？

Thanks ! 谢谢！

Answer 1

Just use <fmt:formatDate> to extract the year from it so that you can do the math on it. 只需使用<fmt:formatDate>从中提取年份，以便您可以对其进行数学运算。

<fmt:formatDate value="${user.birthDate}" pattern="yyyy" var="userBirthYear" />
<c:if test="${userBirthYear le 1970}">
    <doSomeLogic/>
</c:if>

Answer 2

U can use jstl and usebean something like this 你可以使用jstl和usebean这样的东西

    <jsp:useBean id="now" class="java.util.Date"/>
    <c:if test="${someEvent.startDate lt now}"> 
    It's history!</c:if>

Answer 3

You could also add a boolean getter to you bean: 你也可以给你的bean添加一个布尔getter：

public boolean isBirthDateAfter1970(){
    return birthDate.after(dateOf1970);
}

So you can use the following EL: 所以你可以使用以下EL：

<c:if test="${user.birthDateAfter1970}">
   You were born after the sixties.
</c:if>

Answer 4

<c:if test="${date1.time > date2.time}">...</c:if>

or lt , = , gt : 或lt ， = ， gt ：

<c:if test="${date1.time gt date2.time}">...</c:if>

We exploit Long getTime() method of java.util.Date . 我们利用java.util.Date Long getTime()方法。

Answer 5

You can use the (deprecated) methods getYear() , getMonth() , etc. 您可以使用（不推荐使用）方法getYear() ， getMonth()等。

<c:if test="${user.BirthDate.year > 99}">
  <doSomeLogic/>
</c:if>

Note that getYear() returns the year number - 1900. 请注意， getYear()返回年份编号 - 1900。