如何在ANT build中生成Avro .avsc文件

<schema name="example">
  <type name="record">
    <name>Example</name>
    <fields>
      <field name="field1" type="string" />
      <field name="field2" type="int" />
    </fields>
  </type>
</schema>

<?xml version="1.0"?>
<project name="avro-build" default="generate-avro">
  
  <property name="avro-tools.jar" value="path/to/avro-tools.jar" />
  <property name="avsc.file" value="path/to/example.avsc.xml" />
  <property name="output.dir" value="path/to/output/directory" />

  <target name="generate-avro">
    <java classname="org.apache.avro.tool.Main" fork="true">
      <arg value="idl" />
      <arg value="-string" />
      <arg value="${avsc.file}" />
      <arg value="${output.dir}" />
    </java>
  </target>
  
</project>

ant generate-avro