模板中的Freemarker打印日期

Question

我试图在模板激活时打印当前日期。我已经读过，我必须将新的Date（）Java对象传递给模板，但我不知道如何做或者将它放在代码中。

在这种情况下，有人知道如何将Java对象传递给模板吗？

谢谢！

Answer 1

其实你不必通过一个new Date()到您的模板，因为放置一个时间戳到模板的输出是相当普遍的，因此FreeMarker的提供了一个名为special variable其中.now返回当前的日期和时间。您可以在模板中使用这样的：

Page generated: ${.now} 

（FreeMarker的还包含不同的内置插件格式化日期：http://freemarker.org/docs/ref_builtins_date.html）

更新：只与FreeMarker的，2.3.17最新版本的作品。

Answer 2

使用了Freemarker的ObjectConstructor API来创建日历对象和格式化对象，然后将二者结合起来，以打印日期：

<#-- Create constructor object --> 
<#assign objectConstructor = "freemarker.template.utility.ObjectConstructor"?new()> 

<#-- Call calendar constructor --> 
<#assign clock = objectConstructor("java.util.GregorianCalendar")> 

<#-- Call formatter constructor --> 
<#assign mmddyy = objectConstructor("java.text.SimpleDateFormat","MM/dd/yyyy")> 

<#-- Call getTime method to return the date in milliseconds--> 
<#assign date = clock.getTime()> 

<#-- Call format method to pretty print the date --> 
<#assign now = mmddyy.format(date)> 

<#-- Display date --> 
${now} 

The ?new built-in, as it was implemented, was a security hole. Now, it only allows you to instantiate a java object that implements the freemarker.template.TemplateModel interface. If you want the functionality of the ?new built-in as it existed in prior versions, make available an instance of the freemarker.template.utility.ObjectConstructor class to your template. For example:

myDataModel.put("objConstructor", new ObjectConstructor()); 

and then in the template you can do this:

<#assign aList = objConstructor("java.util.ArrayList", 100)>) 

参考

• Freemarker 2.3: Version History

• Tag Developers Guide: Freemarker

• CRUD Operations using Servlet and FreeMarker Template Engine

Answer 3

${.now}是完美的答案。只是想补充一些其他的方法可以从最新获得的直接价值

#-- Predefined format names: --> 

${openingTime?string.short} 
${openingTime?string.medium} 
${openingTime?string.long} 
${openingTime?string.full} 
${openingTime?string.xs} <#-- XSD xs:time --> 
${openingTime?string.iso} <#-- ISO 8601 time --> 

${.now?string.short} 
${.now?string.medium} 
${.now?string.long} 
${.now?string.full} 
${.now?string.xs} <#-- XSD xs:date --> 
${.now?string.iso} <#-- ISO 8601 date --> 

${.now?string.short} 
${.now?string.medium} 
${.now?string.long} 
${.now?string.full} 
${.now?string.medium_short} <#-- medium date, short time --> 
${.now?string.xs} <#-- XSD xs:dateTime --> 
${.now?string.iso} <#-- ISO 8601 combined date and time --> 

<#-- Programmer-defined named format (@ + name): --> 
${.now?string.@fileDate} 

<#-- Advanced ISO 8601 and XSD formatting: --> 
${.now?string.iso_m_u} 
${.now?string.xs_ms_nz} 

<#-- SimpleDateFormat patterns: --> 
${.now?string["dd.MM.yyyy, HH:mm"]} 
${.now?string["EEEE, MMMM dd, yyyy, hh:mm a '('zzz')'"]} 
${.now?string["EEE, MMM d, ''yy"]} 
${.now?string.yyyy} <#-- Same as ${.now?string["yyyy"]} --> 

将输出

01:45 PM 
01:45:09 PM 
01:45:09 PM PST 
01:45:09 PM PST 
13:45:09-08:00 
13:45:09-08:00 

2/20/07 
Apr 20, 2007 
April 20, 2007 
Friday, April 20, 2007 
2007-02-20-08:00 
2007-02-20 

2/20/07 01:45 PM 
Feb 20, 2007 01:45:09 PM 
February 20, 2007 01:45:09 PM PST 
Friday, February 20, 2007 01:45:09 PM PST 
Feb 8, 2003 9:24 PM 
2007-02-20T13:45:09-08:00 
2007-02-20T13:45:09-08:00 

Apr/20/2007 13:45 

2007-02-20T21:45Z 
2007-02-20T13:45:09.000 

08.04.2003 21:24 
Tuesday, April 08, 2003, 09:24 PM (PDT) 
Tue, Apr 8, '03 
2003