ant control statements

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本文介绍如何使用Ant脚本进行文件循环处理，并通过条件判断执行不同操作。包括安装所需组件、配置循环任务、调用其他目标以及传递参数等关键步骤。

Loop

The 'loop' task required ant-contrib package, please download from

http://ncu.dl.sourceforge.net/project/ant-contrib/ant-contrib/1.0b3/ant-contrib-1.0b3-bin.zip

Loop all .txt file in a folder, and take action on each file

    <taskdef name="for" classname="net.sf.antcontrib.logic.ForTask" classpath="${lib.dir}/lib/ant-contrib-1.0b3.jar" />

    <target name="loopfolder">
        <for param="filename">
            <path>=>
                <fileset dir="${folder}" excludes="test.txt" includes="*.txt" />
            </path>
            <sequential>
                <echo message="@{filename}"/>
            </sequential>
        </for>
    </target>

Call Another Target

    <taskdef name="for" classname="net.sf.antcontrib.logic.ForTask" classpath="${lib.dir}/lib/ant-contrib-1.0b3.jar" />
    <target name="loopfolder">
        <for param="filename">
            <path>=>
                <fileset dir="${folder}" excludes="test.txt" includes="*.txt" />
            </path>
            <sequential>
                <echo message="@{filename}"/>
                <antcall target="fileaction"/>
            </sequential>
        </for>
    </target>

    <target name="fileaction">
        <property name="infile" value="${data.dir}/demo.txt"/>
        <echo message="${infile}"/>
    </target>

Call Another Target with parameters passing

    <taskdef name="for" classname="net.sf.antcontrib.logic.ForTask" classpath="${lib.dir}/lib/ant-contrib-1.0b3.jar" />
    <target name="loopfolder">
        <for param="filename">
            <path>=>
                <fileset dir="${folder}" excludes="test.txt" includes="*.txt" />
            </path>
            <sequential>
                <echo message="@{filename}"/>
                <antcall target="fileaction">
                    <param name="infile" value="@{filename}"/>
                </antcall>
            </sequential>
        </for>
    </target>

    <target name="fileaction">
        <property name="infile" value="${data.dir}/demo.txt"/>
        <echo message="${infile}"/>
    </target>

If-Then-Else

The 'if' task required ant-contrib package, please refer to 'Loop' task

        <taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" classpath="${lib.dir}/lib/ant-contrib-1.0b3.jar" />
        <if>
            <filesmatch file1="${infile}" file2="${outfile}"/>
        <then>
            <echo message="File ${infile} and file ${outfile} are same" />
        </then>
        <else>
            <echo message="WARNING: File ${infile} and file ${outfile} are same" />
        </else>
        </if>

Failed a build

        <taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" classpath="${lib.dir}/lib/ant-contrib-1.0b3.jar" />
        <if>
            <filesmatch file1="${infile}" file2="${outfile}"/>
        <then>
            <echo message="File ${infile} and file ${outfile} are same" />
        </then>
        <else>
            <fail message="Build failed because file ${infile} and file ${outfile} are not matched." />
        </if>

ant.project.name

This is global project name, its value is define in 'project' element.

<project name="TestProject" default="compile" basedir=".">
        <property name="yourprojectname"     value="${ant.project.name}"/>
        ...</project>