从Java访问gmail

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

import java.util.Properties;
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;

public class SendEmail {

    public static void main(String[] args) {
        // 设置发件人、收件人和SMTP服务器信息
        String from = "your_email@gmail.com";
        String password = "your_email_password";
        String to = "recipient@example.com";
        String host = "smtp.gmail.com";

        // 设置邮件服务器属性
        Properties props = new Properties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");

        // 获取默认的Session对象
        Session session = Session.getInstance(props, new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(from, password);
            }
        });

        try {
            // 创建MimeMessage对象
            MimeMessage message = new MimeMessage(session);

            // 设置发件人
            message.setFrom(new InternetAddress(from));

            // 设置收件人
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

            // 设置邮件主题和内容
            message.setSubject("JavaMail测试邮件");
            message.setText("这是一个使用JavaMail API发送的测试邮件。");

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

            System.out.println("邮件已成功发送！");

        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}