说明：  JSP留言簿 4个JSP文件，留言簿在个人主页上现在很常见，访问者浏览网页后可以给主人留言，本例实现了一个在JSP 中通过JDBC 连接数据库来实现的留言簿。通过页面浏览器就能实现增加留言或者查看留言的功能，主页的页面如图所示。这是一个学习JSP的实例，主要是通过Statement 对象的executeUpdate()方法把留言信息存入数据库和从数据库中删除留言信息，采用Statement 对象的executeQuery() 方法来从数据库中读取留言。不包括数据库，你可以自己手功创建。
(Guestbook four JSP JSP files on a personal home page book is now very common, visitors can browse the message to the owner of the cases to achieve a connection to a database via JDBC in JSP to achieve guestbook. Comments can be added via a browser page or view comments feature home page as shown. This is a learning JSP instance, the main () method of the message stored in the database via executeUpdate Statement object and delete message from the database, using the Statement object s executeQuery () method to read a message from the database. Does not include the database, you can create your own hand function.)