在JSP中获取今天的日期并将其与Date变量进行比较

问题描述

下面显示了今天抓取的日期/时间，然后再显示在IF语句中进行比较。我确定我硬编码的格式是错误的，但输出的格式是默认的格式。所以问题是如何查看一个日期是否低于另一个日期？如何才能将日期格式化为日期？

  < p> 
< c：set var =testmevalue =<％= new java.util.Date（）％>/> 
< b>< c：out value =$ {testme}/>< / b> 
< / p> 
 
< c：if test =$ {testme lt'Tue Jan 29 16:02:58 GMT 2013'}> 
< p>< b>< span class =wrap>测试日期较少。< / span>< / b>< / p> 
< / c：if> 
  

解决方案

对于初学者，不要混合 和taglibs / EL。这只是麻烦的食谱。使用一个或另一个，而不是两个。假设你想继续使用taglibs / EL，那么你可以这样做：

 < p> 
< jsp：useBean id =todayclass =java.util.Date/> 
< b>< c：out value =$ {today}/>< / b> 
< / p> 
 
< fmt：setLocale value =en_US/> 
< fmt：parseDate var =testdatevalue =Tue Jan 29 16:02:58 GMT 2013​​pattern =EEE MMM dd HH：mm：ss z yyyy/> 
< c：if test =$ {today.time gt testdate.time}> 
< p>< b>< span class =wrap>测试日期小于现在。< / span>< / b>< / p> 
< / c：if> 
  

请注意，我还在变量名称和描述中修复了一些奇怪的对比逻辑。

I am trying to compare dates, on a basic example and cannot work out the best way of doing it.

The below shows grabbing todays date/time and then comparing it in an IF statement. I am sure the format I have hard coded in is wrong, but when outputing the format that is the format it defaults to. So the question is how do I see if one date is lower than the other and how do I format them to date only?

<p>
    <c:set var="testme" value="<%=new java.util.Date()%>"/>
    <b><c:out value="${testme}"/></b>
</p>

<c:if test="${testme lt 'Tue Jan 29 16:02:58 GMT 2013'}">
    <p><b><span class="wrap">Test date is less.</span></b></p>
</c:if>

解决方案

For starters, don't mix Scriptlets and taglibs/EL. That's just recipe for trouble. Use the one or the other and not both. Assuming that you want to go ahead with taglibs/EL, here's how you could do it:

<p>
    <jsp:useBean id="today" class="java.util.Date" />
    <b><c:out value="${today}"/></b>
</p>

<fmt:setLocale value="en_US" />
<fmt:parseDate var="testdate" value="Tue Jan 29 16:02:58 GMT 2013" pattern="EEE MMM dd HH:mm:ss z yyyy" />
<c:if test="${today.time gt testdate.time}">
    <p><b><span class="wrap">Test date is less than now.</span></b></p>
</c:if>

Note that I also fixed some strange contra-logic in variable names and descriptions.

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