java使用TLSv1.3发送邮件，解决 javax.net.ssl.SSLException: Received fatal alert: protocol

前提:使用JDK11版本！！！！！，因为之前的JDK版本不支持TLSv1.3协议，仅支持TLSv1.2协议。
可解决 javax.net.ssl.SSLException: Received fatal alert: protocol_version这个错误
查看邮箱所需要的版本，使用火狐浏览器开发者模式查看

   重点是这句话
    prop.setProperty("mail.smtp.ssl.protocols", "TLSv1.3");

package com.example.teach.controller;

import com.sun.mail.util.MailSSLSocketFactory;



import javax.mail.*;
import javax.mail.internet.*;
import javax.net.ssl.SSLContext;

import java.security.GeneralSecurityException;
import java.util.Properties;

public class SendMail {
    public static void main(String[] args) throws GeneralSecurityException, javax.mail.MessagingException {
        Properties prop = new Properties();
        prop.setProperty("mail.host", "smtp.qq.com");  //设置QQ邮件服务器
        prop.setProperty("mail.transport.protocol", "smtp"); // 邮件发送协议
        prop.setProperty("mail.smtp.auth", "true"); // 需要验证用户名密码
		prop.setProperty("mail.smtp.ssl.protocols", "TLSv1.3");

        System.setProperty("javax.net.debug", "all");

        // QQ邮箱设置SSL加密
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        prop.put("mail.smtp.ssl.enable", "true");
        prop.put("mail.smtp.ssl.socketFactory", sf);

        //1、创建定义整个应用程序所需的环境信息的 Session 对象
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                //传入发件人的姓名和授权码
                return new PasswordAuthentication("xx@qq.com","自己的smtp授权码");
            }
        });

        //2、通过session获取transport对象
        Transport transport = session.getTransport();



        //3、通过transport对象邮箱用户名和授权码连接邮箱服务器
        transport.connect("smtp.qq.com",465,"xx@qq","自己的smtp授权码");

        //4、创建邮件,传入session对象
        MimeMessage mimeMessage = complexEmail(session);

        //5、发送邮件
        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());

        //6、关闭连接
        transport.close();


    }

    public static MimeMessage complexEmail(Session session) throws MessagingException, javax.mail.MessagingException {
        //消息的固定信息
        MimeMessage mimeMessage = new MimeMessage(session);

        //发件人
        mimeMessage.setFrom(new InternetAddress("xx@qq.com"));
        //收件人
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("xx@qq.com"));
        //邮件标题
        mimeMessage.setSubject("邮件");

        //邮件内容
        //准备图片数据
//        MimeBodyPart image = new MimeBodyPart();
//        DataHandler handler = new DataHandler(new FileDataSource("E:\IdeaProjects\WebEmail\resources\测试图片.png"));
//        image.setDataHandler(handler);
//        image.setContentID("test.png"); //设置图片id

        //准备文本
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("这是一段文本","text/html;charset=utf-8");

//        //附件
//        MimeBodyPart appendix = new MimeBodyPart();
//        appendix.setDataHandler(new DataHandler(new FileDataSource("E:\IdeaProjects\WebEmail\resources\测试文件.txt")));
//        appendix.setFileName("test.txt");

        //拼装邮件正文
        MimeMultipart mimeMultipart = new MimeMultipart();
//        mimeMultipart.addBodyPart(image);
        mimeMultipart.addBodyPart(text);
//        mimeMultipart.setSubType("related");//文本和图片内嵌成功

        //将拼装好的正文内容设置为主体
        MimeBodyPart contentText = new MimeBodyPart();
        contentText.setContent(mimeMultipart);

        //拼接附件
        MimeMultipart allFile = new MimeMultipart();
//        allFile.addBodyPart(appendix);//附件
        allFile.addBodyPart(contentText);//正文
//        allFile.setSubType("mixed"); //正文和附件都存在邮件中，所有类型设置为mixed


        //放到Message消息中
        mimeMessage.setContent(allFile);
        mimeMessage.saveChanges();//保存修改

        return mimeMessage;
    }
}