在构建日志中可以方便地识别出构建机器和一些参数；只需使您的main任务依赖此任务即可在每次构建之前将其打印出来。
<!-- Print Environment Info -->
<target name="environment">
<!-- Get the current timestamp -->
<tstamp>
<format property="TODAY_UK" pattern="yyyy-MM-dd HH:mm:ss:sss zzz" locale="cn,CN" />
</tstamp>
<!-- Get the hostname of the system -->
<exec executable="hostname" outputproperty="os.hostname" />
<!-- Print a bunch of information -->
<echo message="" />
<echo message=" Build Information" />
<echo message="" />
<echo message=" OS Information" />
<echo message="" />
<echo message=" User : ${user.name}" />
<echo message=" Hostname : ${os.hostname}" />
<echo message="" />
<echo message=" Name : ${os.name}" />
<echo message=" Version : ${os.version}" />
<echo message=" Build : ${os.arch}" />
<echo message="" />
<echo message="" />
<echo message=" Java Information" />
<echo message="" />
<echo message=" Version : ${ant.java.version} / ${java.version}" />
<echo message=" Java Home : ${java.home}" />
<echo message="" />
<echo message="" />
<echo message=" Current Time : ${TODAY_UK}" />
<echo message="" />
</target>这将导致以下输出，
environment: [echo] [echo] Build Information [echo] [echo] OS Information [echo] [echo] User : <User Name> [echo] Hostname : <Host Name> [echo] [echo] Name : Windows 8.1 [echo] Version : 6.3 [echo] Build : amd64 [echo] [echo] [echo] Java Information [echo] [echo] Version : 1.8 / 1.8.0_45 [echo] Java Home : C:\Program Files\Java\jdk1.8.0_45\jre [echo] [echo] [echo] Current Time : 2016-04-18 00:40:11:011 EDT