MyEclipse 连接Oracle数据库（初学者必看）

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;


public class oraclejdbc {
    public static void main(String[] args) {
        //实例化键盘输入
        Scanner input = new Scanner(System.in);
        //提示输入用户名
        System.out.println("请输入用户名：");
        String loginid=input.next();
        //提示输入密码
        System.out.println("请输入密码：");
        String password=input.next();
        
        //数据库名和登入密码
        String driver="oracle.jdbc.driver.OracleDriver";
        String url="jdbc:oracle:thin:@localhost:1521:ORCL";
        String user = "epet";
        String pwd = "123456";
        Connection con=null;
        PreparedStatement ps=null;
        ResultSet rs=null;
    try {
        Class.forName(driver);
       con=DriverManager.getConnection(url,user,pwd);
       
       //编写sql语句
       String sql="select * from master where loginid=? and password=?";

        //得到结果集
       ps=con.prepareStatement(sql);
       ps.setString(1, loginid);
       ps.setString(2, password);
       rs = ps.executeQuery();
    
     if(rs.next()){
    System.out.println("登入成功！！！");
    }else{
        System.out.println("用户名或密码错误，登入失败！！！");
    }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
              //依次关闭资源
                try {
                    if(rs!=null){
                    rs.close();
                } if(ps!=null){
                    ps.close();
                }if(con!=null){
                    con.close();
                }
                }catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            
        }
    }