Java 邮件 API 不工作？

Question

import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
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;

public class MailSender {

    private Session session;
    private final String username;
    private final String password;

    public MailSender(String username, String password) {
        this.username = username;
        this.password = password;
        init(username, password);
    }

    public final void init(String username, String password) {
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");

        session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(MailSender.this.username, MailSender.this.password);
            }
        });

    }

    public boolean send(String recipient, String subject, String body) {
        boolean status = false;
        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient));
            message.setSubject(subject);
            message.setText(body);
            Transport.send(message);
            status = true;

        } catch (MessagingException ex) {
            Logger.getLogger(MailSender.class.getName()).log(Level.SEVERE, null, ex);
        }
        return status;
    }

    public static void main(String[] args) {
        MailSender mailer = new MailSender("ganeshdatapoint@gmail.com", "******");
        //Userprojects u=new Userprojects();
        boolean status = mailer.send("ganeshdatapoint@gmail.com", "Testing Subject", "Testing message");
        System.out.println(status);
    }
}

例外：

我已使用正确的登录电子邮件 ID 和密码通过 JavamailAPI 编译和执行此程序，下面给出了我的可运行批处理文件命令

身份验证失败异常：534.5.7.14 https://account.google.com/continousSignIn

Answer 1

代码在这里运行良好。

我认为您提供的用户名和/或密码不正确。如果您启用了双向身份验证，还请确保您提供正确的Application Specific Password。

与您的问题无关 - init 方法中使用的参数从未使用过。

所以你可以：

• 从您的init 方法中删除了参数，即init()；

• 将MailSender 实例传递给init 方法，即init(this);

即

public final void init() {
    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");

    session = Session.getInstance(props, new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(MailSender.this.username, MailSender.this.password);
        }
    });
}

或

public final void init(MailSender mailSender) {
    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");

    session = Session.getInstance(props, new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(mailSender.username, mailSender.password);
        }
    });
}