Springboot获取数据库内容

@Controller
public class Con {
    @GetMapping("/sumView")
    public String sumView(Model model  ,String data) {
    List students=new ArrayList<>();
        String sql = "SELECT * FROM stu where 学号=?;"; // 请替换为实际的SQL语句

        try {Connection conn = JdbcUtils.getConnection();
             PreparedStatement pstmt = conn.prepareStatement(sql);
             int num=Integer.parseInt(data);
             pstmt.setInt(1,num);
             ResultSet rs = pstmt.executeQuery();
//            List<Student> list=rs;
            while (rs.next()) {
                long id = rs.getLong("学号");
                String name = rs.getString("姓名");
                int age = 10;
                String gender = rs.getString("性别");
                String str = rs.getString("班级");

                System.out.println("ID: " + id +
                        ", Name: " + name +
                        ", Age: " + age +
                        ", Gender: " + gender +
                        ", Class: " + str);


                // 如果需要将数据传递给视图
               Student student=new Student(id, name, age, gender, str);
               students.add(student);
                model.addAttribute("student", students);
                model.addAttribute("num",data);
            }

        } catch (SQLException e) {
            e.printStackTrace();
            // 可以在这里添加错误处理逻辑
        }

        return "sumView";
    }