如何使用<MacroDef>统计文件夹中不同扩展名的文件数量

Got it! Let's figure out how to use Ant's <MacroDef> to batch count files by their extensions—this will save you from repeating the same <resourcecount> code over and over. Here's a clean, reusable solution tailored to your needs:

Step 1: Define a Reusable Macro #

First, we'll create a macro that encapsulates the logic to count files of a specific extension. This macro will accept parameters for the extension and (optionally) a prefix for the property that stores the count.

<project name="FileExtensionCounter" default="count-extensions">
    <!-- Macro to count files with a given extension -->
    <macrodef name="count-files-by-extension">
        <!-- Required: The file extension to count (e.g., xml, txt) -->
        <attribute name="ext" />
        <!-- Optional: Prefix for the property holding the count (defaults to "count") -->
        <attribute name="property-prefix" default="count" />
        
        <sequential>
            <!-- Use resourcecount to tally files matching the extension -->
            <resourcecount property="@{property-prefix}.@{ext}">
                <fileset dir="${basedir}">
                    <include name="*.@{ext}" />
                </fileset>
            </resourcecount>
            
            <!-- Print the result to the console -->
            <echo message="Found ${@{property-prefix}.@{ext}} *.@{ext} files in ${basedir}" />
        </sequential>
    </macrodef>

Step 2: Call the Macro for Multiple Extensions #

Next, create a target that calls the macro for each extension you want to count. This keeps your code organized and easy to update.

<!-- Target to run batch counting -->
    <target name="count-extensions">
        <!-- Call the macro for each extension -->
        <count-files-by-extension ext="xml" />
        <count-files-by-extension ext="txt" />
        <count-files-by-extension ext="java" />
        <count-files-by-extension ext="properties" />
        
        <!-- Optional: Reuse the counts later in your build -->
        <echo message="--- Summary ---" />
        <echo message="XML files: ${count.xml} | TXT files: ${count.txt}" />
        <echo message="Java files: ${count.java} | Properties files: ${count.properties}" />
    </target>
</project>

How It Works #

• The @{ext} placeholder in the macro gets replaced with the extension you pass when calling the macro (e.g., xml becomes *.xml in the fileset).
• The count is stored in a property like ${count.xml} (using the default prefix) or a custom one if you specify property-prefix.
• You can easily add or remove extensions by adding/removing <count-files-by-extension> calls.

Advanced: Loop Through a List of Extensions #

If you have a long list of extensions, you can use the <foreach> task from ant-contrib to avoid repetitive macro calls (note: you'll need to add ant-contrib to your Ant classpath first):

<taskdef resource="net/sf/antcontrib/antcontrib.properties" />

<target name="count-many-extensions">
    <!-- Define your list of extensions -->
    <property name="extensions" value="xml,txt,java,properties,csv" />
    
    <!-- Loop through the list and call the macro for each extension -->
    <foreach list="${extensions}" delimiter="," target="count-single-extension" param="current.ext" />
</target>

<target name="count-single-extension">
    <count-files-by-extension ext="${current.ext}" />
</target>

内容的提问来源于stack exchange，提问作者Manish Joshi