MailService.java

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package org.usermanagement.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.openkilda.utility.StringUtil;
import org.usermanagement.util.CollectionUtils;



@Service
public class MailService {

    private static final Logger LOGGER = LoggerFactory.getLogger(MailService.class);

    @Autowired
    private TemplateService templateService;

    @Autowired
    private JavaMailSender javaMailSender;
    
    @Value("${mail.from}")
    private String from;

    public void send(final List<String> receivers, final String subject, final TemplateService.Template template,
            final Map<String, Object> context) {
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        MimeMessageHelper msg = new MimeMessageHelper(mimeMessage);
        if (!CollectionUtils.isNullOrEmpty(receivers)) {

            try {
                msg.setFrom(from);
                msg.setSubject(subject);
                msg.setTo(receivers.toArray(new String[receivers.size()]));
                msg.setText(templateService.mergeTemplateToString(template, context), true);

                javaMailSender.send(mimeMessage);
                LOGGER.info("Mail sent successfully. Subject: " + subject);
            } catch (MessagingException e) {
                LOGGER.error("Failed to send mail. Error: " + e.getMessage(), e);
            }
        }
    }

    public void send(final String receiver, final String subject, final TemplateService.Template template, final Map<String, Object> context) {
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        MimeMessageHelper msg = new MimeMessageHelper(mimeMessage);
        if (!StringUtil.isNullOrEmpty(receiver)) {

            try {
                msg.setFrom(from);
                msg.setSubject(subject);
                msg.setTo(receiver);
                msg.setText(templateService.mergeTemplateToString(template, context), true);

                javaMailSender.send(mimeMessage);
                LOGGER.info("Mail sent successfully. Subject: " + subject);
            } catch (MessagingException e) {
                LOGGER.error("Failed to send mail. Error: " + e.getMessage(), e);
            }
        }
    }
}