JAVA实现邮件发送功能

import java.security.GeneralSecurityException;
import java.util.Properties;
import javax.annotation.Resource;
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;
import com.sun.mail.util.MailSSLSocketFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.mail.javamail.JavaMailSender;

public class mail {
    @Resource
    private JavaMailSender javaMailSender;
    private static final Logger logger = LoggerFactory.getLogger(mail.class);

    private static final String TO_EMAIL = "XXXX@qq.com"; // 接收人邮箱地址
    private static final String SMTP_HOST = "smtp.qq.com"; // SMTP服务器
    private static final String USERNAME = "XXXX@qq.com"; // 发送人邮箱用户名
    private static final String PASSWORD = "emsnkzpbifiibeab"; // 发送人邮箱授权码

    public static void sendEmail(String to, String subject, String body) {
        Properties properties = System.getProperties();
        properties.setProperty("mail.smtp.host", SMTP_HOST); // SMTP服务器
        properties.put("mail.smtp.auth", "true");// 是否启用身份验证
        properties.put("mail.smtp.port", "465"); // SMTP服务器的端口号 465 587
        MailSSLSocketFactory sf = null; // sf 是一个信任所有主机的 SSL 工厂实例，用于处理 SSL 握手和加密通信
        try {
            sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);  // 信任所有主机
        } catch (GeneralSecurityException e) {
            logger.error("Error creating SSL socket factory", e);
            return;
        }
        properties.put("mail.smtp.ssl.enable", "true"); // 开启SSL
        properties.put("mail.smtp.ssl.socketFactory", sf); // 设置SSL工厂
        properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); // 设置SSL工厂类
        properties.put("mail.smtp.socketFactory.fallback", "false"); // 不使用回退机制

        Session session = Session.getDefaultInstance(properties, new Authenticator() { // 创建会话
            @Override
            protected PasswordAuthentication getPasswordAuthentication() { // 身份验证
                return new PasswordAuthentication(USERNAME, PASSWORD); // 发送人邮箱用户名和授权码
            }
        });

        try {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(USERNAME)); // 发送人邮箱地址
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to)); // 接收人邮箱地址
            message.setSubject(subject); // 邮件主题
            message.setText(body); // 邮件正文
            Transport.send(message); // 发送邮件
            logger.info("Sent message successfully");
        } catch (MessagingException e) {
            logger.error("Error sending email", e);
        }
    }

    public static void main(String[] args) {
        sendEmail(TO_EMAIL, "This is the Subject Line!", "This is actual message");
    }

完整代码，不会的可以看注释

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