java连接数据库

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import java.sql.*;public class Main{    public static void main(String[] args) {        //声明Connection对象        Connection con;        //驱动程序名        String driver = "com.mysql.jdbc.Driver";        //URL指向要访问的数据库名db        String url = "jdbc:mysql://localhost:3306/db";        //MySQL配置时的用户名        String user = "root";        //MySQL配置时的密码        String password = "123456";        //遍历查询结果集        try {            //加载驱动程序            Class.forName(driver);            //1.getConnection()方法，连接MySQL数据库！！            con = DriverManager.getConnection(url,user,password);            if(!con.isClosed())                System.out.println("Succeeded connecting to the Database!");            //2.创建statement类对象，用来执行SQL语句！！            Statement statement = con.createStatement();            //要执行的SQL语句            String sql = "select * from user";            //3.ResultSet类，用来存放获取的结果集！！            ResultSet rs = statement.executeQuery(sql);            System.out.println("-----------------");            System.out.println("执行结果如下所示:");            System.out.println("-----------------");            System.out.println("id" + "\t" + "name");            System.out.println("-----------------");            String id = null;            String name = null;            String passwords = null;            while(rs.next()){                id = rs.getString("id");                name = rs.getString("name");                passwords=rs.getString("password");                //输出结果                System.out.println(id + "\t" + name+"\t"+passwords);            }            rs.close();            con.close();        } catch(ClassNotFoundException e) {            //数据库驱动类异常处理            System.out.println("Sorry,can`t find the Driver!");            e.printStackTrace();        } catch(SQLException e) {            //数据库连接失败异常处理            e.printStackTrace();        }catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }finally{            System.out.println("数据库数据成功获取！！");        }    }}

需要mysql驱动

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