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虽然现在内容丰富了很多，也不再局限于applet，但是原汁原味的sandbox，仍旧值得回味。 A security measure in the Java development environment. The sandbox is a set of rules that are used when creating an applet that prevents certain functions when the applet is sent as part of a Web page. When a browser requests a Web page with applets, the applets are sent automatically and can be executed as soon as the page arrives in the browser. If the applet is allowed unlimited access to memory and operating system resources, it can do harm in the hands of someone with malicious intent. The sandbox creates an environment in which there are strict limitations on what system resources the applet can request or access. Sandboxes are used when executable code comes from unknown or untrusted sources and allow the user to run untrusted code safely. The Java sandbox relies on a three-tiered defense. If any one of these three elements fails, the security model is completely compromised and vulnerable to attack: byte code verifier -- This is one way that Java automatically checks untrusted outside code before it is allowed to run. When a Java source program is compiled, it compiles down to platform-independent Java byte code, which is verified before it can run. This helps to establish a base set of security guarantees. applet class loader -- All Java objects belong to classes, and the applet class loader determines when and how an applet can add classes to a running Java environment. The applet class loader ensures that important elements of the Java run-time environment are not replaced by code that an applet tries to install. security manager -- The security manager is consulted by code in the Java library whenever a dangerous operation is about to be carried out. The security manager has the option to veto the operation by generating a security exception. 返回类别: 教程 上一教程: jdk 1.5学习之RowSet（二） 下一教程: java 多态与抽象工厂-----------菜鸟学飞第二步 您可以阅读与"纪念Java经典的SandBox概念"相关的教程: · 一个经典的JAVA APPLET时钟程序（一） · java编辑多语言的福音--推荐一个经典的多语言文件编辑的插件ResourceBundle Editor · 一个经典的JAVA APPLET程序（二） · 一个经典的JAVA APPLET时钟程序（一） · Java高级日期概念 （献给那些要国际化时间及SQL时间的兄弟） |
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