①pom依赖

<dependency>   <groupId>com.sun.mail</groupId>   <artifactId>javax.mail</artifactId>   <version>1.5.2</version> </dependency>

②实现

  final Properties props = new Properties();        props.put("mail.smtp.auth", "true");        // 阿里mail (alibaba-inc) 或者163        props.put("mail.smtp.host", "smtp.163.com");        props.put("mail.smtp.port", "465");        props.put("mail.debug", "true");        // 如果使用ssl, 需如下配置,        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");        props.put("mail.smtp.socketFactory.port", "465");        props.put("mail.user", mailSenderEntity.getSenderEmail());        props.put("mail.password", mailSenderEntity.getSenderPwd());        // 构建授权信息, 用于进行smtp进行身份验证        Authenticator authenticator = new Authenticator() {            @Override            protected PasswordAuthentication getPasswordAuthentication() {                //用户名,密码                String userName = props.getProperty("mail.user");                String password = props.getProperty("mail.password");                return new PasswordAuthentication(userName, password);            }        };        //使用环境属性和授权信息，创建邮件会话        Session mailSession = Session.getInstance(props, authenticator);        //创建邮件消息        MimeMessage message = new MimeMessage(mailSession) {        };        try {            // 设置发件人邮件地址和名称。和上面的mail.user保持一致。名称用户可以自定义填写。            InternetAddress from = new InternetAddress(props.getProperty("mail.user"), props.getProperty("mail.user"));            message.setFrom(from);            // 设置收件人邮件地址, 以dot隔开            String toEmails = "3***@qq.com, 4***@qq.com"            InternetAddress[] sendTos = InternetAddress.parse(mailSenderEntity.getRecipientEmails());            message.setRecipients(MimeMessage.RecipientType.TO, sendTos);            //密送            String bccEmails = "1***@qq.com, 2***@qq.com";            if (StringUtil.isNotEmpty(bccEmails)) {                InternetAddress[] bccSendTos = InternetAddress.parse(bccEmails);                message.setRecipients(MimeMessage.RecipientType.BCC, bccSendTos);            }            //抄送            String ccEmails = "1***@qq.com, 2***@qq.com";            if (StringUtil.isNotEmptyccEmails )) {                InternetAddress[] ccSendTos = InternetAddress.parse(ccEmails);                message.setRecipients(MimeMessage.RecipientType.CC, ccSendTos);            }            // 设置邮件标题            message.setSubject("test");            // 设置邮件的内容体            message.setContent("send mail test", "text/html;charset=UTF-8");            message.setSentDate(new Date());            // 发送邮件            Transport.send(message);        } catch (Exception ex) {           e.printStack();                 }