从Ant中的<classpath>生成清单类路径

Question

在下面的构建文件中,jar目标引用了manifest class-path的jar.class.path属性.编译目标引用project.class.path

这里有冗余,因为jar.class.path和project.class.path非常相似.添加库时必须更新它们,如果库列表变得很长,这可能会很麻烦.有没有更好的办法？任何解决方案都必须是跨平台的,并始终使用相对路径.

编辑:
它应该从文件集生成JAR类路径,而不是相反,所以我可以使用通配符,例如在目录中包含所有JAR文件.

<?xml version="1.0"?>
<project name="Higgins" default="jar" basedir=".">

    <property name="jar.class.path" value="lib/forms-1.2.0.jar lib/BrowserLauncher.jar"/>

    <path id="project.class.path">
      <pathelement location="build"/>
      <fileset dir="lib">
        <include name="forms-1.2.0.jar"/>
        <include name="BrowserLauncher.jar"/>
      </fileset>
    </path>

    <target name="prepare">
        <mkdir dir="build"/>
    </target>

    <target name="compile" depends="prepare" description="Compile core sources">
        <javac srcdir="src"
               includes="**"
               destdir="build"
               debug="true"
               source="1.5">
          <classpath refid="project.class.path"/>
        </javac>
    </target>

    <target name="jar" depends="compile" description="Generates executable jar file">
        <jar jarfile="higgins.jar">
            <manifest>
                <attribute name="Main-Class" value="nl.helixsoft.higgins.Main"/>
                <attribute name="Class-Path" value="${jar.class.path}"/>
            </manifest>
            <fileset dir="build" includes="**/*.class"/>            
            <fileset dir="src" includes="**/*.properties"/>         
        </jar>
    </target>

</project>

Answer 1

假设Ant 1.7或更高版本,您可以使用manifestclasspath任务.

<path id="dep.runtime">
    <fileset dir="./lib">
        <include name="**/*.jar" />
    </fileset>
</path>
<property name="dep_cp" value="${toString:dep.runtime}" />

<target name="default">
    <manifestclasspath property="manifest_cp" jarfile="myjar.jar">
        <classpath refid="dep.runtime" />
    </manifestclasspath>
    <echo message="Build Classpath: ${dep_cp}" />
    <echo message="Manifest Classpath: ${manifest_cp}" />
</target>

Answer 2

<path id="build.classpath">
  <fileset dir="${basedir}">
     <include name="lib/*.jar"/>
  </fileset>
</path>

<pathconvert property="manifest.classpath" pathsep=" ">
  <path refid="build.classpath"/>
  <mapper>
    <chainedmapper>
       <flattenmapper/>
       <globmapper from="*.jar" to="lib/*.jar"/>
    </chainedmapper>
  </mapper>
</pathconvert>

<target depends="compile" name="buildjar">
  <jar jarfile="${basedir}/${test.jar}">
     <fileset dir="${build}" />
     <manifest>
       <attribute name="Main-Class" value="com.mycompany.TestMain"/>
       <attribute name="Class-Path" value="${manifest.classpath}"/>
     </manifest>
 </jar>
</target>

有关详细信息,请查看此文章.