sun的典型开源实例，是sun展示J2EE平台时所用的例子，很有用-sun of a typical example of open source, J2EE platform is the sun to display the example used, very useful

宠物店的源代码，这个就不用我多介绍了吧，学习J2EE的经典案例-Pet store the source code, this would not have introduced me to it, to learn a classic example of J2EE