JCE无限制权限策略文件，里面是对应jdk6和jdk7的文件
官网下载地址是
JDK6:http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html
JDK7:http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
参考链接：
http://stackoverflow.com/questions/7325579/java-lang-noclassdeffounderror-could-not-initialize-class-xxx