如何格式化Struts 2 select标签中的日期列表? [英] How would I format a list of dates within a struts 2 select tag?

问题描述

我正在尝试在struts 2 select标签内设置日期格式，但是这样做有困难.我知道这里有一个struts 2日期标签，但我不认为这是我想要的.

I am trying to format dates within a struts 2 select tag but I am having difficulty doing so. I know there is a struts 2 date tag but I don't think that is what I am looking for.

我在这里所做的是在一个选择框内填充一个(周末)日期列表，在这里我可以选择要添加到员工休假表中的日期.基本上，我正在尝试对它们进行格式化，以使其显示得很好且整洁(MM/dd/yyyy)，但我似乎找不到正确的方法来做到这一点.我尝试在下面的列表之间插入格式标签，尝试在标签中使用format.date参数，并尝试使用listValue格式化日期，但似乎无济于事.我在这里想念东西吗?

What I am doing here is populating a select box with a list of (week end)dates where I can choose which dates to add to an employee's time off sheet. Basically I am trying to format them so that it shows up nice and neat (MM/dd/yyyy) but I can't seem to find the correct way to do this. I have tried inserting a format tag in between my list below, I have tried using a format.date parameter in the tag, and I have tried using listValue to format the dates but nothing seems to be working. Am I missing something here?

<s:select size="25" id="inputExclusionDates" name="available" list="availableExclusions" multiple="true" cssClass="multi-select" />

推荐答案

出于乐趣，我花时间弄清楚了如何在OGNL中执行此操作，由于出现了一些奇怪的皱纹，这并不像我预期的那么容易.

For fun I took the time to figure out how to do this in OGNL which was not as easy as I expected because of some strange wrinkle.

以下内容与提供java.text.SimpleDateFormat属性的操作一起使用，该属性称为simpleDateFormat(请注意，在这些select标记中唯一不同的部分是listValue属性):

The following works with an action which supplies a java.text.SimpleDateFormat property called simpleDateFormat (Note the only part that is different in these select tags is the listValue property):

<s:select listValue="simpleDateFormat.format(new java.util.Date(#this[0].time))" size="25" id="inputExclusionDates" name="available" list="availableExclusions" multiple="true" cssClass="multi-select" />

以下内容与上述相同，但是在JSP中执行了所有操作:

The following does the same as the above but does everything in the JSP:

<s:select listValue="(new java.text.SimpleDateFormat('MM/dd/yyyy')).format(new java.util.Date(#this[0].time))" size="25" id="inputExclusionDates" name="available" list="availableExclusions" multiple="true" cssClass="multi-select" />

现在我提到了皱纹，那些有好眼睛的人会注意到表面上似乎多余的表情new java.util.Date(#this[0].time)，毕竟我应该只能说#this[0].毕竟这是有道理的，但不起作用.因此，由于这让我有些困惑，所以我会问一个问题: Strange在s中使用#this时的OGNL行为:选择

Now I mentioned a wrinkle, those with good eyes will have noted the seemingly redundant expression new java.util.Date(#this[0].time) after all I should just be able to say #this[0]. That would make sense after all but it does not work. So since this confused me somewhat I'll ask a question about it: Strange OGNL behaviour when using #this in s:select

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