把数据库逻辑全部放在jsp里未必是好的做法，但是有利于初学者学习，所以我就这样做了，当大家学到一定程度的时候，可以考虑用MVC的模式开发。在练习这些代码的时候，你一定将jdbc的驱动程序放到服务器的类路径里，然后要在数据库里建一个表test,有两个字段比如为test1，test2，可以用下面SQL建 -All logic on the database in jsp is not necessarily good practice, but is conducive to learning for beginners, so I do this, when the U.S. learned to some extent, they can consider the use of MVC pattern of development. In practice these codes, you must be jdbc driver on the server classpath, and then to build a database table test, there are two fields such as for test1, test2, can be used to build the following SQL