Ant:重命名文件以包含其 MD5 [英] Ant: Rename files to include their MD5

问题描述

对于熟悉 ant 的人来说，这个问题可能非常简单，到目前为止我只使用了其中的基础知识.

The question is likely VERY trivial for anyone familiar with ant, of which I only use the basics thus far.

我知道如何重命名文件，例如我已经在用了:

<copy todir="build/css/">
    <fileset dir="css/">
        <include name="*.css"/>
    </fileset>
    <globmapper from="*.css" to="*-min.css"/>
</copy>

我知道如何计算 MD5:

<checksum file="foo.bar" property="foobarMD5"/>

我不知道如何将第二个包含在第一个中，重命名所有这些文件以包含它们的 MD5 - 目的是用作网络浏览器缓存破坏者.另一个缓存破坏选项，附加?[something]"并不好，正如一些谷歌网站管理员页面所解释的那样，将 MD5 作为名称的一部分更好.

I don't know how to include the second into the first, to rename all those files to include their MD5 - the purpose is to serve as webbrowser cache buster. The other cache-busting option, to append "?[something]" is not as good, as is explained on some Google webmaster pages, having the MD5 as part of the name is better.

推荐答案

您无需包含 ant contrib 即可执行此操作.我必须在工作中实现这一点，并且出于安全原因不允许引入该扩展.我找到的解决方案是这样的:

You could do this without having to include ant contrib. I had to implement this for work and was not allowed to introduce that extension for security reasons. The solution I came to was this:

<target name="appendMD5">
    <copy todir="teststack">
        <fileset dir="css/" includes="**/*.css"/>
        <scriptmapper language="javascript"><![CDATA[
            var File = Java.type('java.io.File');
            var Files = Java.type('java.nio.file.Files');
            var MessageDigest = Java.type('java.security.MessageDigest');
            var DatatypeConverter = Java.type('javax.xml.bind.DatatypeConverter');

            var buildDir = MyProject.getProperty('builddir');
            var md5Digest = MessageDigest.getInstance('MD5');
            var file = new File(buildDir, source);
            var fileContents = FIles.readAllBytes(file.toPath());

            var hash = DatatypeConverter.printHexBinary(md5Digest.digest(fileContents));
            var baseName = source.substring(0, source.lastIndexOf('.'));
            var extension = source.substring(source.lastIndexOf('.'));

            self.addMappedName(baseName + '-' + hash + extension);
        ]]></scriptmapper>
    </copy>
</target>

值得注意的是，我是为 Java 8 编写的，但经过一些细微的调整，它可以在 Java 7 上运行.遗憾的是，如果不付出更多努力，这将不适用于早期版本的 Java.

It is worth noting that I wrote this for Java 8 but with some minor tweaks it could work on Java 7. Sadly this won't work for earlier versions of Java without more effort.

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