Spring boot email(1)

Email protocols

SMTP: upload and transfer between mail servers.
POP3: pull emails to local.
IMAP: After receiving the email, the email is still reserved on the server. Mapping client and server.
Mime: SMTP was using ASCII. Mime extends to binary transfer.

Unit test

We need to add two annotations in the unit test class

@RunWith(SpringRunner.class)
@SpringBootTest


Spring-boot-starter-mail
Maven dependency

    org.springframework.boot
    spring-boot-starter-mail


property file
spring.mail.host=smtp.gmail.com
spring.mail.username=
spring.mail.password=
spring.mail.default-encoding=utf-8

#If you use Gmail, the follow two lines are necessary
spring.mail.properties.mail.smtp.socketFactory.port = 465
spring.mail.properties.mail.smtp.socketFactory.class = javax.net.ssl.SSLSocketFactory

Sending a simple text email
@Service
public class MailService {

    @Value("${spring.mail.username}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    public void sendSimpleMail(String to, String subject, String content) {
 SimpleMailMessage message = new SimpleMailMessage();
 message.setTo(to);
 message.setSubject(subject);
 message.setText(content);
 message.setFrom(from);

 mailSender.send(message);
    }
}

Test this service
@RunWith(SpringRunner.class)
@SpringBootTest
public class MailServiceTest {

    @Resource
    MailService mailService;

    @Test
    public void sendSimpleMail() {
 mailService.sendSimpleMail("",
    "Test email",
    "Hello World");
    }
}

Sending a HTML email
public void sendHTMLMail(String to, String subject, String content) throws MessagingException {
    MimeMessage message = mailSender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(message, true);
    helper.setFrom(from);
    helper.setTo(to);
    helper.setSubject(subject);
    helper.setText(content, true);
    mailSender.send(message);
}

Test this service
@Test
public void sendHTMLMail() throws MessagingException {
    String content = "nn Hello world! This is a HTML email.nn";
    mailService.sendHTMLMail("", "HTML Email", content);
}

Sending an email with attachments
public void sendAttachmentMail(String to, String subject, String content, String filePath) throws MessagingException {
    MimeMessage message = mailSender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(message, true);
    helper.setFrom(from);
    helper.setTo(to);
    helper.setSubject(subject);
    helper.setText(content, true);

    FileSystemResource file = new FileSystemResource(new File(filePath));
    String filename = file.getFilename();
    helper.addAttachment(filename, file);
    mailSender.send(message);
}

@Test
public void sendAttachmentMail() throws MessagingException {
    String filePath = "C:\Users\***";
    mailService.sendAttachmentMail("",
     "Test email",
     "Hello World", filePath);
}

Spring boot email(1)

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