用Myeclipse写的java程序可以连接数据库而jsp就不行，为什么？
这是java代码可以成功输出：
import java.sql.*;
public class test {
public static void main(String[] srg){
int i=0;
String driverName ="com.microsoft.sqlserver.jdbc.SQLServerDriver"; //加载JDBC驱动
String dbURL = "jdbc:sqlserver://localhost:1433;DatabaseName=bank"; //连接服务器和数据库test
String userName = "sa"; //默认用户名
String userPwd = "123456"; //密码
Connection con;
Statement sql;
ResultSet rs;
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch(ClassNotFoundException e){
System.out.println("没有找到数据库！");
}
try{
con=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=bank","sa","123456");
sql=con.createStatement();
rs=sql.executeQuery("SELECT * FROM customer");
System.out.println("下面分别代表："+" "+"customer_name"+" "+"customer_street"+" "+"customer_city");
while(rs.next())
{
i++;
System.out.println("第"+i+"个用户：");
System.out.println(rs.getString("customer_name")+" "+rs.getString("customer_street")+" "+rs.getString("customer_city"));
}
con.close();
}
catch(SQLException e){
System.out.println("SQL异常！！！");
}
}
}
下面是jsp的，输出没有找到数据库和SQL异常：
%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.sql.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>BankDataBase</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<% Connection con;
Statement sql;
ResultSet rs;
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch(ClassNotFoundException e){
out.println("没有找到数据库！");
}
try{
con=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=bank","sa","123456");
sql=con.createStatement();
rs=sql.executeQuery("SELECT * FROM customer");
out.println("<table border>");
out.println("<tr><td colspan=3 align=center>用户数据</td></tr>");
out.println("<tr>");
out.println("<td>customer_name</td>");
out.println("<td>customer_street</td>");
out.println("<td>customer_city</td>");
out.println("</tr>");
while(rs.next())
{ out.println("<tr>");
out.println("<td>"+rs.getString("customer_name")+"</td>");
out.println("<td>"+rs.getString("customer_street")+"</td>");
out.println("<td>"+rs.getString("customer_city")+"</td>");
out.println("</tr>");
}
out.println("</table>");
con.close();
}
catch(SQLException e){
out.println("SQL异常！！！");
}
%>
</body>
</html>
[解决办法]
jsp可以连接数据库的，你是怎么输出的，tomcat启动没了，还有看你的驱动包位置放正确没
我测试的mysql数据库可以连接的
<%@ page language="java" import="java.util.*, java.sql.*" pageEncoding="GB18030"%>
<%@ page import="com.registration.service.*" %>
<%@ page import="com.registration.model.*" %>
<%@ page import="com.registration.service.impl.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
User u = new User();
u.setUsername(username);
u.setPassword(password);
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/spring", "root", "root");
UserManager um = new UserManagerImpl();
boolean exist = um.exists(u);
if(exist) {
response.sendRedirect("registerFail.jsp");
return;
}
um.add(u);
response.sendRedirect("registerSuccess.jsp");
%>