Ant 用特征控制Ant

1.根据特定条件执行目标

    设置目标if和/或unless属性为某个特征名称完成的。

<?xml version="1.0" encoding="UTF-8"?>
<project name="property" default="echoall">

	<target name="echoall" if="output">
		<echo message="echoall:执行echoall,output is ${output}"/>
	</target>

</project>

 输出，在特征output在定义时输出内容，未定义时不输出内容，与特征的值无关：

e:\antspace\property>ant
Buildfile: e:\antspace\property\build.xml

echoall:

BUILD SUCCESSFUL
Total time: 0 seconds

e:\antspace\property>ant -Doutput=a
Buildfile: e:\antspace\property\build.xml

echoall:
     [echo] echoall:执行echoall,output is a

BUILD SUCCESSFUL
Total time: 0 seconds

    2. 设定构建失败条件

测试：

<?xml version="1.0" encoding="UTF-8"?>
<project name="property" default="echoall">

	<target name="echoall">
		<echo message="echoall:执行echoall,output is ${output}"/>
	</target>

	<fail message="output未定义，构建结束" unless="output">
	</fail>

</project>

    或

<?xml version="1.0" encoding="UTF-8"?>
<project name="property" default="echoall">

	<target name="echoall">
		<echo message="echoall:执行echoall,output is ${output}"/>
		<fail message="output未定义，构建结束" unless="output" />
	</target>
</project>

输出：

e:\antspace\property>ant
Buildfile: e:\antspace\property\build.xml

BUILD FAILED
e:\antspace\property\build.xml:8: output未定义，构建结束

Total time: 0 seconds

e:\antspace\property>ant -Doutput=a
Buildfile: e:\antspace\property\build.xml

echoall:
     [echo] echoall:执行echoall,output is a

BUILD SUCCESSFUL
Total time: 0 seconds

    3.根据特定条件包含/排除模式集

测试：

<?xml version="1.0" encoding="UTF-8"?>
<project name="property" default="buildjava">

	<target name="buildjava" depends="mkbuild">
		<javac srcdir="src" includeantruntime="false" destdir="build">
			<exclude name="xuj/ant/Main.java" unless="build"/>
		</javac>
	</target>

	<target name="mkbuild">
		<delete dir="build"/>
		<mkdir dir="build"/>
	</target>

</project>

 输出：

e:\antspace\property>ant
Buildfile: e:\antspace\property\build.xml

mkbuild:
   [delete] Deleting directory e:\antspace\property\build
    [mkdir] Created dir: e:\antspace\property\build

buildjava:

BUILD SUCCESSFUL
Total time: 0 seconds

e:\antspace\property>ant -Dbuild=a
Buildfile: e:\antspace\property\build.xml

mkbuild:
   [delete] Deleting directory e:\antspace\property\build
    [mkdir] Created dir: e:\antspace\property\build

buildjava:
    [javac] Compiling 1 source file to e:\antspace\property\build

BUILD SUCCESSFUL
Total time: 0 seconds