JDBConnection.java代码如下
package com;
import java.sql.*;
public class JDBConnection{
private final String dbDriver=
"com.microsoft.jdbc.sqlserver.SQLServerDriver"; //连接sql数据库的方法
private final String url=
"jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_database02";
private final String userName="sa";
private final String password="";
private Connection con=null;
public JDBConnection(){
try{
Class.forName(dbDriver).newInstance(); //加载数据库驱动
}
catch(Exception ex){
}
}
private boolean creatConnection()
{
try{
con=DriverManager.getConnection(url,userName,psaaword);
con.setAutoCommit(true）；
}catch(SQLException e){
}
return true;
}
public ResultSet executeQuery(String sql)
{
ResultSet rs;
try
{
if(con==null)
{
creatConnection();
}
Statement stmt=con.createStatement();
try{
rs=stmt.executeQuery(sql);
}catch(SQLException e){
return null;
}
}catch(SQLException e){
return null;
}
return rs;
}
public void closeConnection()
{
if(con!=null)
{
try{
con.close();
}catch(SQLException e){
}finally
{
con=null;
}
}
}
}
.jsp文件如下：
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@page import="com.JDBConnection"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<table width="382" height="245" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td height="36" align="center">将数据库中的内容添加到下拉列表中</td>
</tr>
<tr>
<jsp:useBean id="connection" scope="request" class="com.JDBConnection"/>
<td height="209" valign="top">
<%
String sql="Seclect *from tb_wyClass";
ResultSet rs=connection.executeQuery(sql);
%>