java怎么实现邮件发送功能 使用JavaMail API发送邮件的实例

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

<dependency>
    <groupId>jakarta.mail</groupId>
    <artifactId>jakarta.mail-api</artifactId>
    <version>2.0.1</version>
</dependency>

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

public class EmailUtil {

    public static void sendEmail(String to, String subject, String body) {
        // 发件人邮箱（例如QQ邮箱）
        final String from = "your_email@qq.com";
        final String password = "your_authorization_code"; // 注意：不是登录密码，是SMTP授权码

        // 设置邮件服务器（以QQ邮箱为例）
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true"); // 启用 TLS

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

        // 获取 Session 对象
        Session session = Session.getInstance(props, auth);

        try {
            // 创建邮件消息
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);
            message.setText(body);

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

    // 测试方法
    public static void main(String[] args) {
        sendEmail("recipient@example.com", "测试邮件", "这是一封通过 JavaMail 发送的测试邮件。");
    }
}

MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject("HTML 邮件");

// 创建内容
MimeMultipart multipart = new MimeMultipart();

// 添加 HTML 内容
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent("<h1>这是一封HTML邮件</h1><p>支持<strong>加粗</strong>等样式。</p>", "text/html;charset=utf-8");
multipart.addBodyPart(htmlPart);

// 设置完整消息内容
message.setContent(multipart);
Transport.send(message);