Java实现邮件发送的具体代码

以下是Java实现邮件发送的具体代码：

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class EmailSender {
    public static void main(String[] args) {
        // 收件人的邮箱地址
        String to = "receiver@example.com";

        // 发件人的邮箱地址和密码
        String from = "sender@example.com";
        String password = "password";

        // 邮件主题和内容
        String subject = "Test Email";
        String text = "This is a test email.";

        // 邮件服务器和端口号
        String host = "smtp.example.com";
        int port = 587;

        // 创建邮件会话
        Properties props = new Properties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getInstance(props);

        try {
            // 创建邮件对象
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
            message.setSubject(subject);
            message.setText(text);

            // 发送邮件
            Transport transport = session.getTransport("smtp");
            transport.connect(host, port, from, password);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();

            System.out.println("Email sent successfully.");
        } catch (MessagingException e) {
            System.out.println("Failed to send email. Error message: " + e.getMessage());
        }
    }
}

请注意，此代码需要JavaMail API和Java Activation Framework（JAF）库。您可以从以下链接下载它们：

- JavaMail API：https://javaee.github.io/javamail/
- Java Activation Framework（JAF）：https://javaee.github.io/javamail/