File.delete () 只能删除空目录 ：这是 Java File.delete () 的语义——非空目录删除会失败。 而真实构建目录通常包含 build.xml 、 log 、 archive/ 等文件，因此更稳妥的是改用 Groovy 的 deleteDir () （递归删除），或在删除前先递归清理子内容。

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