public void testOracle() {    try {      Class.forName("oracle.jdbc.driver.OracleDriver");      Connection conn = DriverManager.getConnection(          "jdbc:oracle:thin:@localhost:1521:orcl", "system", "admin");      System.out.println("連接成功！");      Statement stmt = conn.createStatement();      ResultSet rs = stmt.executeQuery("select *　from　stu_info_tab");      while (rs.next()) {        System.out.println("ok");        System.out.println(rs.getInt("student_id"));      }      rs.close();      stmt.close();      conn.close();    } catch (ClassNotFoundException e) {      System.out.println("ClassNotFoundException");    } catch (SQLException e) {      System.out.println("SQLException");    }}