Ant 条件判断 if

转载自ant 条件判断 condition


最近收到一个ticket，用ant写个build.xml，用到condition，作笔记如下：
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>

评论

1 楼 greatplan 2013-07-10  

<?xml version="1.0" encoding="GBK"?>
<project name="testCondition"  default="test" basedir="."> 
    <!--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 message="is ture" /> 
    </target> 
    <target name="isFalse" unless="scondition"> 
        <echo message="is false" />
    </target> 
</project>