public static Connection getConnection() {
        Connection conn = null;
        String driver ="oracle.jdbc.driver.OracleDriver"; 
        String url = "jdbc:oracle:thin:@localhost:1521:oracle";
        String uName = "scott";
        String pswd = "tiger";
        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url, uName, pswd);
        } catch (ClassNotFoundException e) {
            System.out.println("类加载错误"+e.getMessage());
        } catch (SQLException e) {
            System.out.println("连接错误"+e.getMessage());
            e.printStackTrace();
        }
        
        return conn;
        
    }