说明：  用java实现与数据库的连接..例如有一张数据库的表里面有几条数据用java将数据库表内的数据显示在java的表单属性java实现对数据库的增,删,改,查.四种方法
(For example, there are several pieces of data in a database table. The data in the database table is displayed in the form attribute Java of Java to increase, delete, change and check the database.)