@Component
public class MailUtil {

    @Autowired
    JavaMailSenderImpl mailSender;
    
    static {
        System.setProperty("mail.mime.splitlongparameters","false");
    }

    /**
     * @return 郵件發件人,也可以設定到配置檔案中
     */
    private String getAddress(){
        return "";
    }

    public void send(String content, String subject, String email){
        SimpleMailMessage message = new SimpleMailMessage();
        message.setSubject(subject);
        message.setText(content);
        message.setTo(email);
        message.setFrom(getAddress());
        mailSender.send(message);
    }

    public void sendHtml(String content, String subject, String email){
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper;
        try {
            helper = new MimeMessageHelper(mimeMessage, false, "UTF-8");
            helper.setFrom(getAddress());
            helper.setTo(email);
            helper.setText(content, true);
            mailSender.send(mimeMessage);
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

    public void sendAttachment(String content, String subject, String email, String filePath){
        sendAttachment(content,subject, email, filePath, FilenameUtils.getName(filePath));
    }

    /**
     *
     * @param content 郵件內容
     * @param subject 郵件標題
     * @param email 郵箱
     * @param filePath 附件路徑
     * @param fileName 附件名
     */
    public void sendAttachment(String content, String subject, String email, String filePath, String fileName) {
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper;
        try {
            helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");
            helper.setFrom(getAddress());
            helper.setTo(email);
            helper.setText(content, false);
            helper.addAttachment(MimeUtility.encodeWord(fileName, "UTF-8", "B"), new File(filePath));
            mailSender.send(mimeMessage);
        } catch (MessagingException | UnsupportedEncodingException e) {
            //可以在異常中進行處理,例如重發
            e.printStackTrace();
        }
    }

    public void sendAttachments(String content, String subject, String email, List<String> filePaths) {
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper;
        try {
            helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");
            helper.setFrom(getAddress());
            helper.setTo(email);
            helper.setText(content, false);
            for (String filePath : filePaths) {
                helper.addAttachment(MimeUtility.encodeWord(FilenameUtils.getName(filePath), "UTF-8", "B"), new File(filePath));
            }
            mailSender.send(mimeMessage);
        } catch (MessagingException | UnsupportedEncodingException e) {
            //可以在異常中進行處理,例如重發
            e.printStackTrace();
        }
    }
}
 

application.properties檔案

spring.mail.host=1.1.1.1
spring.mail.username=wen.jie
spring.mail.password=wen.jie
spring.mail.default-encoding=UTF-8
spring.mail.port=25
spring.mail.properties.mail.smtp.auth=false
spring.mail.properties.mail.smtp.timeout=250000