java安全机制 控制文件的授权 读写控制
在java中的java.policy这个文件中，定义了一些信息，比如grant等，就是对某些文件进行授权的，类似于liscense文件，
此文件采用了沙箱的模式 ，封装了一些允许的范围，提高的安全度，
一下为java.policy的内容:
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