MySQL과 Java를 사용하여 간단한 이메일 전송 기능을 구현하는 방법

CREATE DATABASE mail;

USE mail;

CREATE TABLE mails (
    id INT PRIMARY KEY AUTO_INCREMENT,
    sender VARCHAR(50),
    receiver VARCHAR(50),
    subject VARCHAR(100),
    body TEXT,
    sent_date DATETIME
);

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

public class MailSender {
    // 邮件服务器地址
    private static final String SMTP_HOST = "smtp.example.com";
    // 邮件服务器端口
    private static final int SMTP_PORT = 587;
    // 发送者邮箱地址
    private static final String SENDER_EMAIL = "sender@example.com";
    // 发送者邮箱密码
    private static final String SENDER_PASSWORD = "password";

    // 数据库连接池
    private static DataSource dataSource;

    // 初始化数据库连接池
    static {
        dataSource = setupDataSource();
    }

    // 获取数据库连接
    private static DataSource setupDataSource() {
        MysqlDataSource ds = new MysqlDataSource();
        ds.setURL("jdbc:mysql://localhost:3306/mail");
        ds.setUser("root");
        ds.setPassword("password");
        return ds;
    }

    // 发送邮件
    public void sendMail(String receiver, String subject, String body) throws MessagingException, NamingException {
        // 创建会话
        Properties props = new Properties();
        props.put("mail.smtp.host", SMTP_HOST);
        props.put("mail.smtp.port", SMTP_PORT);

        Session session = Session.getInstance(props, new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(SENDER_EMAIL, SENDER_PASSWORD);
            }
        });

        // 创建邮件
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(SENDER_EMAIL));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(receiver));
        message.setSubject(subject);
        message.setText(body);

        // 发送邮件
        Transport.send(message);

        // 将邮件记录插入数据库
        try (Connection conn = dataSource.getConnection()) {
            String sql = "INSERT INTO mails(sender, receiver, subject, body, sent_date) VALUES (?, ?, ?, ?, NOW())";
            Object[] params = { SENDER_EMAIL, receiver, subject, body };
            QueryRunner runner = new QueryRunner();
            runner.insert(conn, sql, new ScalarHandler<>(), params);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        MailSender sender = new MailSender();
        
        try {
            String receiver = "receiver@example.com";
            String subject = "邮件主题";
            String body = "邮件内容";

            sender.sendMail(receiver, subject, body);
            
            System.out.println("邮件发送成功！");
        } catch (MessagingException | NamingException e) {
            e.printStackTrace();
        }
    }
}