Send mail to springboot

summary

Usage scenario

1. Registration verification
2. Marketing push
3. Trigger mechanism
4. Monitoring alarm

Mail Transfer Protocol

1. SMTP protocol: the full name is Simple Mail Transfer Protocol. It defines the communication rules between the mail client software and the SMTP mail server, as well as between the two SMTP mail servers.
2. POP3 protocol: the full name is Post Office Protocol. It defines the communication rules between mail client software and POP3 mail server.
3. IMAP protocol: its full name is Internet Message Access Protocol. It is an extension of POP3 protocol and defines the communication rules between mail client software and IMAP mail server.

Send mail to springboot

Prepare mailbox

Open the service and add an authorization password

Introduce dependency

pom.xml relies on the spring boot starter mail module:

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

Add configuration

spring:
	#mail
  mail:
    host: smtp.163.com
    # Your email 163
    username: 163 Send email
    # Note that the SMTP authorization password is not here
    password: smtp Authorization code
    port: 25
    protocol: smtp
    default-encoding: UTF-8

code

Service class

@Slf4j
@Service
public class MailService {
    @Value("${spring.mail.username}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    /**
     * Set the email attachment name not to be intercepted, and solve the problem of garbled Chinese name of the attachment
     */
    public MailService() {
        System.setProperty("mail.mime.splitlongparameters", "false");
    }

    /**
     * Simple text mail
     *
     * @param to      Recipient mail
     * @param subject Mail subject
     * @param contnet Mail content
     */
    public void sendSimpleMail(String to, String subject, String contnet) {

        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(contnet);
        message.setFrom(from);

        mailSender.send(message);
    }

    /**
     * HTML Text mail
     *
     * @param to      Recipient mail
     * @param subject Mail subject
     * @param contnet HTML content
     * @throws MessagingException
     */
    public void sendHtmlMail(String to, String subject, String contnet) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(contnet, true);
        helper.setFrom(from);

        mailSender.send(message);
    }

    /**
     * Attachment mail
     *
     * @param to       Recipient mail
     * @param subject  Mail subject
     * @param contnet  HTML content
     * @param filePath Attachment path
     * @throws MessagingException
     */
    public void sendAttachmentsMail(String to, String subject, String contnet,
                                    String filePath) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(contnet, true);
        helper.setFrom(from);

        FileSystemResource file = new FileSystemResource(new File(filePath));
        String fileName = file.getFilename();
        helper.addAttachment(fileName, file);

        mailSender.send(message);
    }

    /**
     * Picture mail
     *
     * @param to      Recipient mail
     * @param subject Mail subject
     * @param contnet HTML content
     * @param rscPath Picture path
     * @param rscId   Picture ID
     * @throws MessagingException
     */
    public void sendInlinkResourceMail(String to, String subject, String contnet,
                                       String rscPath, String rscId) {
        log.info("Start sending static mail: {},{},{},{},{}", to, subject, contnet, rscPath, rscId);

        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = null;

        try {

            helper = new MimeMessageHelper(message, true);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(contnet, true);
            helper.setFrom(from);

            FileSystemResource res = new FileSystemResource(new File(rscPath));
            helper.addInline(rscId, res);
            mailSender.send(message);
            log.info("Sending static email succeeded!");

        } catch (MessagingException e) {
            log.info("Failed to send static mail: ", e);
        }

    }

}

Test class

@RunWith(SpringRunner.class)
@SpringBootTest(classes = HealthApplication.class)
public class MailServiceTest {
    @Autowired
    private MailService mailService;
    private String toMail = "1048579371@qq.com";

    @Test
    public void sendSimpleMail() {
        mailService.sendSimpleMail(toMail,"test spring boot imail-theme","test spring boot imail - content");
    }

    @Test
    public void sendHtmlMail() throws MessagingException {

        String content = "<html>\n" +
                "<body>\n" +
                "<h3>hello world</h3>\n" +
                "<h1>html</h1>\n" +
                "<body>\n" +
                "</html>\n";

        mailService.sendHtmlMail(toMail,"This is a letter HTML mail",content);
    }

    @Test
    public void sendAttachmentsMail() throws MessagingException {
        String filePath = "/Users/liufq/Downloads/ECG customer ranking 2020-08-26 16_26_54.xlsx";
        String content = "<html>\n" +
                "<body>\n" +
                "<h3>hello world</h3>\n" +
                "<h1>html</h1>\n" +
                "<h1>Attachment transmission</h1>\n" +
                "<body>\n" +
                "</html>\n";
        mailService.sendAttachmentsMail(toMail,"This is a letter HTML mail",content, filePath);
    }

    @Test
    public void sendInlinkResourceMail() throws MessagingException {
        //TODO changed to local picture directory
        String imgPath = "/ijiangtao/img/blob/dd9899b4cf95cbf074ddc4607007046c022564cb/blog/animal/dog/dog-at-work-with-computer-2.jpg?raw=true";
        String rscId = "admxj001";
        String content = "<html>" +
                "<body>" +
                "<h3>hello world</h3>" +
                "<h1>html</h1>" +
                "<h1>Picture mail</h1>" +
                "<img src='cid:"+rscId+"'></img>" +
                "<body>" +
                "</html>";

        mailService.sendInlinkResourceMail(toMail,"This is a picture email",content, imgPath, rscId);
    }

}

deploy

In the production environment, the general mail service will be deployed separately and exposed through HTTP or MQ.

problem

Solution of Chinese garbled code of attachment display name

Reason: if the length of the encoded file name is greater than 60, the value of splitLongParameters is true, and the value of encodeParameters is true, the file name will be intercepted

Add settings to the structure of the service, or add settings to the main startup class

 public MailService() {
        System.setProperty("mail.mime.splitlongparameters", "false");
    }

550 User has no permission

smtp authorization is enabled for the sender's mailbox

reference material

https://blog.csdn.net/sinat_26342009/article/details/89425836