basic elements: istrue isfalse not and or xor available isset equals filesmatch
1、istrue isfalse:断言 真 假
<project name="testCondition">
<target name="test">
<condition property="scondition">
<istrue value="true"/>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
2、逻辑运算
2.1、not 逻辑非
<project name="testCondition">
<target name="test">
<condition property="scondition">
＜not>
<istrue value="true"/>
</not>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
2.2、and 逻辑与
<project name="testCondition">
<target name="test">
<condition property="scondition">
＜and>
<istrue value="true"/>
<istrue value="false"/>
</and>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
2.3、or 逻辑或 xor异或 (语法上与and类似)
3、available 是否可用
<project name="testCondition">
<path id="all.test.classes">
<pathelement location="bin"/>
</path>
<target name="test">
<condition property="scondition">
<!--在指定的classpath路径下是否存在资源 TestTest.class-->
<available resource="TestTest.class">
<classpath refid="all.test.classes" />
</available>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
4、isset 指定属性是否存在
<project name="testCondition">
<!--属性也可以通过ant参数-D来设置-->
<property name="name" value="this is name"/>
<target name="test">
<condition property="scondition">
<!--如果属性name不存在则返回false-->
<isset property="name"/>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
5、equals 是否相等
<project name="testCondition">
<!--属性也可以通过ant参数-D来设置-->
<property name="name" value="this is name"/>
<target name="test">
<condition property="scondition">
<!--如果arg1的值与arg2的值相等返回true，否则为false-->
<equals arg1="${name}" arg2="this is name"/>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
6、filesmatch 比较文件
<project name="testCondition">
<target name="test">
<condition property="scondition">
<!--如果file1所代表的文件与file2所代表的文件相等返回true，否则为false-->
<filesmatch file1="testfile1.txt" file2="testfile2.txt"/>
</condition>
<antcall target="isTrue"></antcall>
<antcall target="isFalse"></antcall>
</target>
<target name="isTrue" if="scondition">
<echo>is ture</echo>
</target>
<target name="isFalse" unless="scondition">
<echo>is false</echo>
</target>
</project>
判断文件夹是否存在：
<condition property="buildexists">
<available file="${basedir}" type="dir"></available>
</condition>
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