J2EE实现mvc模式的事例，简单易懂，而且其中没有用到连接数据库的功能，用list模拟了该功能，使其可以无需调试环境直接运行。 -J2EE achieve mvc model examples, simple to understand, but which did not use to connect to the database functions, with a list of the simulation function, it can not run debugging envi