Ant 条件判断 if

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>