source: src/main/java/com/example/salonbella/service/mail/EmailService.java

package com.example.salonbella.service.mail;


import lombok.AllArgsConstructor;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.internet.MimeMessage;

@AllArgsConstructor
@Service
public class EmailService {

    private JavaMailSender javaMailSender;

    public void send(String to, String name, String token) {
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        try {

            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, false,"utf-8");
            helper.setText(buildEmail(name, "http://localhost:8080/confirm?token=" + token), true);
            helper.setTo(to);
            helper.setSubject("Confirm your account");
            helper.setFrom("salonbella@gmail.com");
            javaMailSender.send(mimeMessage);
        } catch (Exception ignored) {

        }
    }


    private String buildEmail(String name, String link) {
        return "<div style=\"font-family:Helvetica,Arial,sans-serif;font-size:16px;margin:0;color:#0b0c0c\">\n" +
                "\n" +
                "<span style=\"display:none;font-size:1px;color:#fff;max-height:0\"></span>\n" +
                "\n" +
                "  <table role=\"presentation\" width=\"100%\" style=\"border-collapse:collapse;min-width:100%;width:100%!important\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\">\n" +
                "    <tbody><tr>\n" +
                "      <td width=\"100%\" height=\"53\" bgcolor=\"#0b0c0c\">\n" +
                "        \n" +
                "        <table role=\"presentation\" width=\"100%\" style=\"border-collapse:collapse;max-width:580px\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" align=\"center\">\n" +
                "          <tbody><tr>\n" +
                "            <td width=\"70\" bgcolor=\"#0b0c0c\" valign=\"middle\">\n" +
                "                <table role=\"presentation\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:collapse\">\n" +
                "                  <tbody><tr>\n" +
                "                    <td style=\"padding-left:10px\">\n" +
                "                  \n" +
                "                    </td>\n" +
                "                    <td style=\"font-size:28px;line-height:1.315789474;Margin-top:4px;padding-left:10px\">\n" +
                "                      <span style=\"font-family:Helvetica,Arial,sans-serif;font-weight:700;color:#ffffff;text-decoration:none;vertical-align:top;display:inline-block\">Confirm your email</span>\n" +
                "                    </td>\n" +
                "                  </tr>\n" +
                "                </tbody></table>\n" +
                "              </a>\n" +
                "            </td>\n" +
                "          </tr>\n" +
                "        </tbody></table>\n" +
                "        \n" +
                "      </td>\n" +
                "    </tr>\n" +
                "  </tbody></table>\n" +
                "  <table role=\"presentation\" class=\"m_-6186904992287805515content\" align=\"center\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:collapse;max-width:580px;width:100%!important\" width=\"100%\">\n" +
                "    <tbody><tr>\n" +
                "      <td width=\"10\" height=\"10\" valign=\"middle\"></td>\n" +
                "      <td>\n" +
                "        \n" +
                "                <table role=\"presentation\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:collapse\">\n" +
                "                  <tbody><tr>\n" +
                "                    <td bgcolor=\"#1D70B8\" width=\"100%\" height=\"10\"></td>\n" +
                "                  </tr>\n" +
                "                </tbody></table>\n" +
                "        \n" +
                "      </td>\n" +
                "      <td width=\"10\" valign=\"middle\" height=\"10\"></td>\n" +
                "    </tr>\n" +
                "  </tbody></table>\n" +
                "\n" +
                "\n" +
                "\n" +
                "  <table role=\"presentation\" class=\"m_-6186904992287805515content\" align=\"center\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:collapse;max-width:580px;width:100%!important\" width=\"100%\">\n" +
                "    <tbody><tr>\n" +
                "      <td height=\"30\"><br></td>\n" +
                "    </tr>\n" +
                "    <tr>\n" +
                "      <td width=\"10\" valign=\"middle\"><br></td>\n" +
                "      <td style=\"font-family:Helvetica,Arial,sans-serif;font-size:19px;line-height:1.315789474;max-width:560px\">\n" +
                "        \n" +
                "            <p style=\"Margin:0 0 20px 0;font-size:19px;line-height:25px;color:#0b0c0c\">Hi " + name + ",</p><p style=\"Margin:0 0 20px 0;font-size:19px;line-height:25px;color:#0b0c0c\"> Thank you for registering. Please click on the below link to activate your account: </p><blockquote style=\"Margin:0 0 20px 0;border-left:10px solid #b1b4b6;padding:15px 0 0.1px 15px;font-size:19px;line-height:25px\"><p style=\"Margin:0 0 20px 0;font-size:19px;line-height:25px;color:#0b0c0c\"> <a href=\"" + link + "\">Activate Now</a> </p></blockquote>\n Link will expire in 30 minutes. <p>See you soon</p>" +
                "        \n" +
                "      </td>\n" +
                "      <td width=\"10\" valign=\"middle\"><br></td>\n" +
                "    </tr>\n" +
                "    <tr>\n" +
                "      <td height=\"30\"><br></td>\n" +
                "    </tr>\n" +
                "  </tbody></table><div class=\"yj6qo\"></div><div class=\"adL\">\n" +
                "\n" +
                "</div></div>";
    }
}