首先,需要在 Eclipse 中创建一个基于
Java Web 的项目,然后添加
MySQL JDBC 驱动程序。接下来,创建一个名为“Mail”的
数据库,并创建一个名为“messages”的表来存储邮件信息。表结构如下: “` CREATE TABLE messages ( id INT(11) NOT NULL AUTO_INCREMENT, sender VARCHAR(255) NOT NULL, recipient VARCHAR(255) NOT NULL, subject VARCHAR(255) NOT NULL, message TEXT NOT NULL, timestamp TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) ); “` 然后,创建一个 Mail 类来表示邮件,包含发送者、收件人、主题、消息和时间戳等属性。例如: “`
java public class Mail { private int id; private String sender; private String recipient; private String subject; private String message; private Timestamp timestamp; // Getter and setter methods } “` 接下来,创建一个名为“MailDAO”的类来处理与邮件相关的
数据库操作,包括添加、更新、删除和
查询邮件等。例如: “`
java public class MailDAO { private Connection conn; public MailDAO() { try { Class.forName(“com.
mysql.cj.jdbc.Driver”); conn = DriverManager.getConnection(“jdbc:
mysql://localhost:3306/Mail”, “username”, “password”); } catch (Exception e) { e.printStackTrace(); } } public void addMail(Mail mail) { try { PreparedStatement ps = conn.prepareStatement(“INSERT INTO messages (sender, recipient, subject, message) VALUES (?, ?, ?, ?)”); ps.setString(1, mail.getSender()); ps.setString(2, mail.getRecipient()); ps.setString(3, mail.getSubject()); ps.setString(4, mail.getMessage()); ps.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } } public void updateMail(Mail mail) { try { PreparedStatement ps = conn.prepareStatement(“UPDATE messages SET sender=?, recipient=?, subject=?, message=? WHERE id=?”); ps.setString(1, mail.getSender()); ps.setString(2, mail.getRecipient()); ps.setString(3, mail.getSubject()); ps.setString(4, mail.getMessage()); ps.setInt(5, mail.getId()); ps.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } } public void deleteMail(int id) { try { PreparedStatement ps = conn.prepareStatement(“DELETE FROM messages WHERE id=?”); ps.setInt(1, id); ps.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } } public List<Mail> getMails(String recipient) { List<Mail> mails = new ArrayList<>(); try { PreparedStatement ps = conn.prepareStatement(“SELECT * FROM messages WHERE recipient=?”); ps.setString(1, recipient); ResultSet rs = ps.executeQuery(); while (rs.next()) { Mail mail = new Mail(); mail.setId(rs.getInt(“id”)); mail.setSender(rs.getString(“sender”)); mail.setRecipient(rs.getString(“recipient”)); mail.setSubject(rs.getString(“subject”)); mail.setMessage(rs.getString(“message”)); mail.setTimestamp(rs.getTimestamp(“timestamp”)); mails.add(mail); } } catch (SQLException e) { e.printStackTrace(); } return mails; } } “` 最后,创建一个名为“Mail
Servlet”的
Servlet 类来处理邮件显示功能。在 doGet() 方法中,使用 MailDAO 类从
数据库中检索特定收件人的所有邮件,并将它们作为属性设置到 request 对象中,然后将请求转发到
JSP 页面来显示邮件。例如: “`
java public class Mail
Servlet extends Http
Servlet { private MailDAO mailDAO; public void init() { mailDAO = new MailDAO(); } public void doGet(Http
ServletRequest request, Http
ServletResponse response) throws
ServletException, IOException { String recipient = request.getParameter(“recipient”); List<Mail> mails = mailDAO.getMails(recipient); request.setAttribute(“mails”, mails); request.getRequestDispatcher(“mail.
jsp“).forward(request, response); } } “` 最后,创建一个名为“mail.
jsp”的
JSP 页面来显示邮件。例如: “`
jsp <%@ page language=”
java” contentType=”text/html; charset=UTF-8″ pageEncoding=”UTF-8″%> <%@ taglib uri=”http://
java.sun.com/
jsp/jstl/core” prefix=”c”%> <!DOCTYPE html> <html> <head> <meta charset=”UTF-8″> <title>Mail</title> </head> <body> <h1>Mail</h1> <table> <tr> <th>Sender</th> <th>Subject</th> <th>Message</th> <th>Timestamp</th> </tr> <c:forEach var=”mail” items=”${mails}”> <tr> <td>${mail.sender}</td> <td>${mail.subject}</td> <td>${mail.message}</td> <td>${mail.timestamp}</td> </tr> </c:forEach> </table> </body> </html> “` 以上就是基于 Eclipse 和
Java Web 的
MySQL 8Navicat for Premium 9.0.2激活.0 邮件显示功能的
实现。今天的文章
Navicat for Premium 9.0.2激活(基于 JSP+Servlet+MySQL8.0的数据查询学生管理系统)分享到此就结束了,感谢您的阅读。
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