红帽全球峰会20.19. 从目录读取，默认移动操作
Camel 默认会将任何已处理的文件移动到来自该文件的目录中的 .camel 子目录中。
from("file://inputdir/?recursive=true&delete=true").to("file://outputdir")
按如下所示影响布局 ：
inputdir/foo.txt
inputdir/sub/bar.txtafter
inputdir/.camel/foo.txt
inputdir/sub/.camel/bar.txt
outputdir/foo.txt
outputdir/sub/bar.txt
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