jsp+mysql 数据库操作

package test;

import java.sql.*;

public class Conn

{

static String data ="jdbc:mysql://localhost/first";

static java.sql.Statement st;

public static void databaseconnect()

{ //函数用于连接数据库

try

{

Class.forName("com.mysql.jdbc.Driver");

Connection conn = DriverManager.getConnection(data, "root", "root");

st = conn.createStatement();

}

catch (Exception e)

{

System.out.println("异常："+e.toString());

}

public static String pwquery(String name)

{

databaseconnect();

String inname = name;

String pw = "";

ResultSet rs=null;

try

{

rs = ((java.sql.Statement) st).executeQuery("select * from test2 where name=\'"+name+"\'");

while(rs.next())

{

pw=rs.getString("pass");

}

rs.close();

st.close();

//pw="abc";

}

catch (SQLException e)

{

e.printStackTrace();

}

return pw;

}

<?xml version="1.0" encoding="gb2312" ?>

<%@ page language="java" contentType="text/html; charset=gb2312"%>

<%@page import="test.Conn" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

String temp=(String)session.getValue("login");

temp= Conn.pwquery("admin");

// out.print(temp);

out.print(temp);

</body>

</html>

注意把 tomcat\common\lib
添加
mysql-connector-java-5.0.8-bin.jar