问题描述
我正在为 OpenCMS 项目构建 Ant 期间编写一个 manifest.xml 文件.
I am writing a manifest.xml file during an Ant build for an OpenCMS project.
我需要能够提取文件的创建日期和文件的上次修改日期.(尽管当前进程为每个文件提供了 Wed, 31 Dec 1969 19:00:00 EST 的时间戳 - 至少在运行构建时的 Windows 机器上是这样.)
I need to be able to pull up a file's create date, and last modified date on a file. (Although the current process is giving each file a timestamp of Wed, 31 Dec 1969 19:00:00 EST anyway -- at least on Windows machines when they run the build.)
有没有办法在 Ant 中提取文件的创建日期时间戳?我正在使用标准 Ant 任务和 Ant-Contrib 任务.
Is there a way I can pull up the creation date timestamp of a file in Ant? I'm using standard Ant tasks and Ant-Contrib tasks.
推荐答案
这取决于您的操作系统，例如Unix 不存储文件创建时间，在此处查看详细信息
两种可能的解决方案:
It depends on your OS, f.e. Unix doesn't store the file creation time, see details here
Two possible solutions :
解决方案 1，仅适用于 Java >= 6 的 Windows，不需要插件
Solution 1, works on Windows only with Java >= 6, no addons needed
<project>
<!-- Works on Windows only, uses the jdk builtin
rhino javascript engine (since jdk6)
use dir command without /T:C to get lastmodificationtime
-->
<macrodef name="getFileTimes">
<attribute name="dir" />
<attribute name="file" />
<attribute name="setprop" default="@{file}_ctime" />
<sequential>
<exec executable="cmd" dir="@{dir}" outputproperty="@{setprop}">
<arg value="/c" />
<arg line="dir @{file} /T:C|find ' @{file}'" />
</exec>
<script language="javascript">
tmp = project.getProperty("@{setprop}").split("\\s+") ;
project.setProperty("@{setprop}", tmp[0] + "/" + tmp[1]) ;
</script>
</sequential>
</macrodef>
<getFileTimes dir="C:/tmp" file="bookmarks.html" />
<echo>
$${bookmarks.html_ctime} => ${bookmarks.html_ctime}
</echo>
</project>
解决方案 2，需要 Java 7 和 groovy-all-xxxjar(包含在 groovy 二进制版本)
根据您的喜好调整 SimpleDateFormat.
在 Unix 文件系统上，当要求创建时间时，您将获得最后修改时间.
Solution 2, needs Java 7 and groovy-all-x.x.x.jar (contained in groovy binary release)
Adjust the SimpleDateFormat to your liking.
On Unix filesystems when asking for creationtime you'll get the last modification time.
<project>
<taskdef name="groovy" classname="org.codehaus.groovy.ant.Groovy"/>
<!-- Solution for Java 7, uses the nio package
needs groovy-all-2.1.0.jar
-->
<macrodef name="getFileTimes">
<attribute name="file"/>
<attribute name="ctimeprop" default="@{file}_ctime"/>
<attribute name="mtimeprop" default="@{file}_mtime"/>
<sequential>
<groovy>
import java.nio.file.*
import java.nio.file.attribute.*
import java.text.*
import java.util.date.*
Path path = Paths.get("@{file}")
BasicFileAttributeView view = Files.getFileAttributeView(path, BasicFileAttributeView.class)
BasicFileAttributes attributes = view.readAttributes()
lastModifiedTime = attributes.lastModifiedTime()
createTime = attributes.creationTime()
DateFormat df = new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss", Locale.US)
df.format(new Date(createTime.toMillis()))
properties.'@{ctimeprop}' = df.format(new Date(createTime.toMillis()))
properties.'@{mtimeprop}' = df.format(new Date(lastModifiedTime.toMillis()))
</groovy>
</sequential>
</macrodef>
<getFileTimes file="C:/tmp/bookmarks.html"/>
<echo>
$${C:/tmp/bookmarks.html_ctime} => ${C:/tmp/bookmarks.html_ctime}
$${C:/tmp/bookmarks.html_mtime} => ${C:/tmp/bookmarks.html_mtime}
</echo>
</project>
我也尝试过使用内置的 javascript 引擎，但我遇到了如下错误:
I tried also using the builtin javascript engine, but i got errors like :
sun.org.mozilla.javascript.internal.EvaluatorException: missing name after . operator
IMO，对于简单的事情，使用 javascript <script language="javascript"> 就足够了，但是如果您需要导入 java 包等......这是一个 PITA.Groovy 很简单.
IMO, for simple things using javascript <script language="javascript"> is sufficient, but if you need to import java packages etc. .. it's a PITA. Groovy simply works.
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