<% Student student = new Student(); // student.setNum(request.getParameter("num")); // student.setName(request.getParameter("name")); // StudentDao studentDao = new StudentDao(); studentDao.addStudent(student); %> StudentDao public int addStudent(Student student) throws Exception { 请补充代码使得这个studentDao的添加学生信息的代码完整 }

可以参考以下代码实现：

public int addStudent(Student student) throws Exception {
    Connection conn = null;
    PreparedStatement pstmt = null;
    int result = 0;
    try {
        conn = DBHelper.getConnection();
        String sql = "INSERT INTO student(num, name) VALUES(?, ?)";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, student.getNum());
        pstmt.setString(2, student.getName());
        result = pstmt.executeUpdate();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        DBHelper.closeConnection(conn, pstmt);
    }
    return result;
}

其中，`DBHelper` 是一个数据库连接工具类，`getConnection()` 方法用于获取数据库连接，`closeConnection()` 方法用于关闭数据库连接。具体实现可以根据自己的需要进行修改。