ant compile任务（javac）

<target name="compile" description="Compile main source tree java files">
           <!--compile source code-->
        <mkdir dir="${build.dir}/classes"/>
        <javac destdir="${build.dir}/classes" target="1.4" debug="true"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${src.dir}"/>
            <classpath refid="classpath"/>
        </javac>
        <!-- compile tests -->
        <mkdir dir="${test.dir}/classes"/>
        <javac destdir="${test.dir}/classes" target="1.4" debug="true"
            deprecation="false" optimize="false" failonerror="true">
            <src path="${test.src}"/>
            <classpath>
                <path refid="classpath"/>
                <path location="${build.dir}/classes"/>
            </classpath>
        </javac>
        <!-- Copy hibernate mapping files to ${build.dir}/classes -->
        <copy todir="${build.dir}/classes">
            <fileset dir="${src.dir}" includes="**/*.hbm.xml"/>
        </copy>
    </target>