摘要： 首先归纳了通过WWW从Internet上下载一段不可信任的可执行代码在本地机器上运行时可能造成的各种危害，接着重点介绍了Java系统防止这些危害的机制及实现方法，随后分析了其效果，最后讨论了进一步的改进方法。

关键词: WWW, Java, 字节码, 安全性, 浏览器

Abstract: This paper first concludes the possible dangers when a program downloaded from Internet through WWW is run on the local machine. Then it discusses the mechanism and method Java system uses to avoid these possible dangers. In the end, it analyzes the effect and iniroduces some methods to enforce the security.

中图分类号: 

• TP312