Java开发简易邮件发送系统指南

    com.sun.mail
    javax.mail
    1.6.2

import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;

public class EmailSender {

    public static void send(String to, String subject, String content) {
        // 发件人邮箱
        final String from = "your_email@qq.com";
        final String password = "your_authorization_code"; // 授权码

        // 配置属性
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.port", "465");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.ssl.enable", "true");

        // 创建认证器
        Authenticator auth = new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(from, password);
            }
        };

        // 获取会话
        Session session = Session.getInstance(props, auth);
        session.setDebug(true); // 开启调试模式

        try {
            // 创建邮件
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);
            message.setContent(content, "text/html;charset=UTF-8"); // 支持HTML

            // 发送
            Transport.send(message);
            System.out.println("邮件发送成功！");
        } catch (MessagingException e) {
            System.err.println("邮件发送失败：" + e.getMessage());
            e.printStackTrace();
        }
    }

    // 测试调用
    public static void main(String[] args) {
        send("recipient@example.com", "测试标题", "
这是一封测试邮件
支持HTML格式内容
");
    }
}