求教web数据库操作问题
D:\Tomcat 5.0\webapps\sqlserver下有index.html
D:\Tomcat 5.0\webapps\sqlserver\WEB-INF下有web.xml
D:\Tomcat 5.0\webapps\sqlserver\WEB-INF\classes下有AddBook.java和AddBook.class
其中：
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index.html内容如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN ">
<HTML>
<HEAD>
<TITLE> 添加图书到SQL Server数据库 </TITLE>
<META NAME= "Generator " CONTENT= "EditPlus ">
<META NAME= "Author " CONTENT= " ">
<META NAME= "Keywords " CONTENT= " ">
<META NAME= "Description " CONTENT= " ">
</HEAD>
<BODY>
<h2> <B> 在下面输入图书信息后提交 </b> </h2> <Br>
<form method= "post " action= "/sqlserver/servlet/AddBook ">
图书名称： <input type= "text " name= "bookname "> <Br>
图书作者: <input type= "text " name= "bookauthor "> <Br>
图书价格: <input type= "text " name= "bookprice "> <Br>
图书介绍: <textarea name= "bookintroduce " rows=6> </textarea> <Br>
<input type= "submit " value= "提交 "> <input type= "reset " value= "重填 ">
</form>
</BODY>
</HTML>
-----------------------------------
web.xml内容如下：
<?xml version= "1.0 " encoding= "ISO-8859-1 "?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN "
"http://java.sun.com/dtd/web-app_2_3.dtd ">
<web-app>
<display-name> Welcome to Tomcat </display-name>
<description>
Welcome to Tomcat
</description>
<!-- JSPC servlet mappings start -->
<!-- 实例6-1 -->
<servlet>
<servlet-name> AddBook </servlet-name>
<display-name> AddBook </display-name>
<description> A test Servlet </description>
<servlet-class> AddBook </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> AddBook </servlet-name>
<url-pattern> /AddBook </url-pattern>
</servlet-mapping>
--------------------------
AddBook内容如下：
/* AddBook.java添加一本图书到数据库 */
//导入相关的包
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class AddBook extends HttpServlet
{
//定义servlet的post方法
public void doPost(HttpServletRequest request,HttpServletResponse response) throws
ServletException,
外类型产生了多少个实例,内部类就被定义了多少次 