发送邮件

https://www.cnblogs.com/xdp-gacl/p/4220190.html
https://blog.youkuaiyun.com/qq_28379809/article/details/80080311

1. 注册邮箱
推荐使用163邮箱，然后开启POP3/SMTP/IMAP服务，接着开启客户端授权密码。
2. javamail——maven配置依赖包
<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4</version>
</dependency>
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注意：有些版本可能会报错，如1.4.7版本（亲测）
3. 创建与发送邮件
发送邮件需要什么：发件邮箱、发件邮箱密码、收件邮箱、邮件内容；

public class EmailServiceImpl {
    public static String rootEmailAddress = "xxx@163.com";
    //客户端授权密码
    public static String rootEmailPassword = "xxxx";
    public static String rootEmailSMTPHost = "smtp.163.com";

    /**
     * 发送指定content的邮件至用户邮箱
     * @param targetEmail
     * @param username
     * @param content
     * @return
     */
    public boolean sendEmail(String targetEmail, String username, String content) {
        Properties props = new Properties();
        props.setProperty("mail.transport.protocol", "smtp");   // 使用的协议（JavaMail规范要求）
        props.setProperty("mail.smtp.host", rootEmailSMTPHost);   // 发件人的邮箱的 SMTP 服务器地址
        props.setProperty("mail.smtp.auth", "true");            // 需要请求认证

        //根据配置创建会话对象，用于和邮件服务器交互
        Session session = Session.getInstance(props);
        session.setDebug(true);

        //创建一封邮件
        try {
            MimeMessage message = createMimeMessage(session,targetEmail,username,content);
            Transport transport = session.getTransport();

            transport.connect(rootEmailAddress, rootEmailPassword);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 创建邮件
     * @param session
     * @param targetEmail
     * @param username
     * @param content
     * @return
     * @throws Exception
     */
    public static MimeMessage createMimeMessage(Session session,String targetEmail,String username,String content) throws Exception {
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(rootEmailAddress,"root","UTF-8"));//root即是发件人name
        message.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(targetEmail,username,"UTF-8"));
        message.setSubject("测试邮件", "UTF-8");
        message.setContent(content, "text/html;charset=UTF-8");
        message.setSentDate(new Date());
        message.saveChanges();
        return message;
    }