文章收集
http://www.cnblogs.com/Y/archive/2011/03/24/JavaVM_Learning_Chapter3_Security.html
http://www.ibm.com/developerworks/cn/java/j-javaauth/
http://lilw.bokee.com/1685636.html
http://www.jdzj.com/data/program/2029.htm
http://elec.wanfangdata.com.cn/qikan/periodical.articles/wxjyyy/wxjy2000/0004/000416.htm
