如此链接所述,似乎禁止阅读EJB的文件:
http://java.sun.com/blueprints/qanda/ejb_tier/restrications.html#files_access
Enterprise beans aren t allowed to access files primarily because files are not transactional resources. Allowing EJBs to access files or directories in the filesystem, or to use file descriptors, would compromise component distributability, and would be a security hazard.
什么是“妥协成分可分配性”?
http://onjava.com/pub/a/onjava/excerpt/java_servletes_ch12/index.html?page=2#how2be" rel=“不跟随 nofollow noreferrer”“如何从企业服务站和J2EE分发 :
EJB可分布于若干后端机器中,并可由集装箱酌情在机器之间移动。为了能够使这种分销模式成为可能,EJB必须严格按照规格界定的规则,说明它们能够做什么和不能做什么。
文件系统可能因机器和机器而不同,文件描述符肯定是不同的。使用它们可以防止 EJB 迁移和/或消能。
另见
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