Servlet JDBC工具类

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBUtil {
    //mysql数据库驱动
    private final static String DRIVER="org.gjt.mm.mysql.Driver";
    //数据库连接字符串
    private final static String URL="jdbc:mysql://localhost:3306/db"; 
    //用户名
    private final static String USERNAME="root";
    //密码
    private final static String PASSWORD="57694187";
    private static Connection conn;
    
    public static  Connection getConnection(){
        try{
            Class.forName(DRIVER);
            conn=DriverManager.getConnection(URL,USERNAME,PASSWORD);
        }catch (ClassNotFoundException e) {
            e.printStackTrace();
        }catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    
    public static void close(){
        try {
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}