在Java中如何实现图书借阅提醒通知功能_借阅提醒项目开发方法说明

public class User {
    private String name;
    private String email;
    private String phone;
    // getter/setter
}
<p>public class Book {
private String title;
private String isbn;
// getter/setter
}</p><p>public class BorrowRecord {
private User user;
private Book book;
private LocalDate borrowDate;
private LocalDate dueDate;
private boolean returned;
// getter/setter
}</p>

@Service
public class ReminderService {
<pre class='brush:java;toolbar:false;'>@Scheduled(cron = "0 0 8 * * ?") // 每天早上8点执行
public void sendDueReminders() {
    List<BorrowRecord> dueSoonRecords = findDueSoonRecords(3); // 找出3天内到期的记录
    for (BorrowRecord record : dueSoonRecords) {
        sendEmail(record.getUser().getEmail(), 
            "图书归还提醒", 
            "您借阅的《" + record.getBook().getTitle() + "》将于" + record.getDueDate() + "到期，请及时归还。");
    }
}

private void sendEmail(String to, String subject, String content) {
    // 使用JavaMailSender发送邮件
}

private List<BorrowRecord> findDueSoonRecords(int days) {
    // 查询数据库：SELECT * FROM borrow_record WHERE due_date = CURDATE() + INTERVAL ? DAY AND returned = false
    return // 查询结果映射为List
}

public interface NotificationService {
    void send(String target, String message);
}
<p>@Component
public class EmailNotification implements NotificationService {
public void send(String email, String message) { /<em> 发送邮件 </em>/ }
}</p>