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jsp新手,请教各位? - Java / Web 开发

程序如下:
<%@ page contentType="text/html; charset=GBK" %>
<%@ page language="java" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<html>
<head>
<title>title</title>
</head>
<body>
<%
//驱动程序名
String driverName="com.mysql.jdbc.Driver";
//数据库用户名
String username="root";
//密码
String password="*******";
//数据库名
String dbName="study";
//表名
String tableName="product";
//连接字符串
String url="jdbc:mysql://localhost/"+dbName+"?characterEncoding=GBK";
try{
  //加载驱动程序
  Class.forName("com.mysql.jdbc.Driver");
  //建立同数据库的连接对象
  Connection connection=DriverManager.getConnection(url,username,password);
  Statement statement = connection.createStatement();
  String sql="SELECT * from "+tableName;
  //发送要执行的SQL语句
  ResultSet rs = statement.executeQuery(sql);
  out.print("数据库连接成功<BR>");
  while(rs.next())
  {
  out.print(rs.getint(1));
  out.print(rs.getString("pdm"));
  out.print(rs.getString("pname


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