java连接oracle 入门odbc

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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("连接成功！");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");}}

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备注：默认的用户名是system，密码是自己设定的，不能用sys或者是sysdba，这个只是角色