This is the 19th day of my participation in the August More Text Challenge

Email configuration

  1. pom.xml

    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<! Use thymeleaf to parse the template -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
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  2. application.yaml

    spring:
  mail:
    host: smtp.qq.com
    port: 465
    username: [email protected]
    password: caifdytfhvaqdiif
    protocol: smtp
    test-connection: true
    default-encoding: UTF-8
    properties:
      mail.smtp.auth: true
      mail.smtp.ssl.enable: true
      mail.smtp.starttls.enable: true
      mail.smtp.starttls.required: true
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The simple mail

  1. Utility methods

    public interface MailService {
    void sendSimpleMail(String to, String subject, String content, String... cc);
}

@Service
public class MailServiceImpl implements MailService {

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

    @Override
    public void sendSimpleMail(String to, String subject, String text, String... cc) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(text);
        if(ArrayUtil.isEmpty(cc)) { message.setCc(cc); } mailSender.send(message); }}Copy the code

  2. Method of use

    @SpringBootTest
class MailTests {
    @Autowired
    MailService mailService;

    @Test
    void sendSimpleMail(a) throws Exception {
        mailService.sendSimpleMail("[email protected]"."Title"."Test content"); }}Copy the code

Template mail

  1. Utility methods

    public interface MailService {
    void sendTempLateMail(String to, String subject, String content, String... cc) throws MessagingException;
}

@Service
public class MailServiceImpl implements MailService {

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

    @Override
    public void sendTempLateMail(String to, String subject, String content, String... cc) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setFrom(from);
        helper.setTo(to);
        helper.setSubject(subject);
        // Parse to HTML
        helper.setText(content, true);
        if(ArrayUtil.isEmpty(cc)) { helper.setCc(cc); } mailSender.send(message); }}Copy the code

  2. Method of use

    @SpringBootTest
class MailTests {
    @Autowired
    MailService mailService;
    // Thymeleaf template parsing tool
    @Autowired
    private TemplateEngine templateEngine;
    // Set templateResolver
    @Autowired
    private ApplicationContext context;

 	@Test
    void sendTemplateMail(a) throws Exception {
        SpringResourceTemplateResolver templateResolver 
            = new SpringResourceTemplateResolver();
        templateResolver.setApplicationContext(context);
        templateResolver.setCacheable(false);
        templateResolver.setPrefix("classpath:/email/");
        templateResolver.setSuffix(".html");
        templateEngine.setTemplateResolver(templateResolver);

        Context context = new Context();
        context.setVariable("name"."Cade");
        context.setVariable("age"."23");
        context.setVariable("sex"."boy");

        // If templateResolver is not used, the default is the HTML file in the templates folder
        String emailTemplate = templateEngine.process("test", context);
        mailService.sendTempLateMail("[email protected]"."Template mail", emailTemplate); }}Copy the code

With the attachment

  1. Utility methods

    public interface MailService {
    void sendAttachmentsMail(String to, String subject, String content, String filePath, String... cc) throws MessagingException;
}

@Service
public class MailServiceImpl implements MailService {

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

    @Override
    public void sendAttachmentsMail(String to, String subject, String content, String filePath, String... cc) 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);
        if (ArrayUtil.isEmpty(cc)) {
            helper.setCc(cc);
        }
        FileSystemResource file = new FileSystemResource(new File(filePath));
        // Use the URL object getPath to return the path/without using file.separator
        String fileName = filePath.substring(filePath.lastIndexOf("/")); helper.addAttachment(fileName, file); mailSender.send(message); }}Copy the code

  2. Method of use

    @SpringBootTest
class MailTests {
    @Autowired
    MailService mailService;
    @Autowired
    private TemplateEngine templateEngine;
    @Autowired
    private ApplicationContext context;	
	
    @Test
    void sendAttachmentsMail(a) throws MessagingException {
        URL resource = this.getClass().getResource("/static/img.jpg");
        mailService.sendAttachmentsMail("[email protected]"."Attached Mail"."Please check the attachment in the email!", resource.getPath()); }}Copy the code

Static resource

  1. Utility methods

    public interface MailService {
    void sendAttachmentsMail(String to, String subject, String content, String filePath, String... cc) throws MessagingException;
}

@Service
public class MailServiceImpl implements MailService {

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

    @Override
    public void sendResourceMail(String to, String subject, String content, String resourcePath, String contentId, String... cc) 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);
        if (ArrayUtil.isNotEmpty(cc)) {
            helper.setCc(cc);
        }
        FileSystemResource res = new FileSystemResource(newFile(resourcePath)); helper.addInline(contentId, res); mailSender.send(message); }}Copy the code

  2. Method of use

        @Test
    public void sendResourceMail(a) throws MessagingException {
        String contentId = "cade";
        // Cid of the img tag :contentId is used to replace placeholders
        String content = "<html>" +
                "<body>" +
                "Carrying messages with static resources 

    "     +
                "<img src=\'cid:" + contentId + "\' >" +
                "</body>" +
                "</html>";
        URL resource = this.getClass().getResource("/static/img.jpg");
        mailService.sendResourceMail("[email protected]"."Static Resource Mail", 
                                     content, resource.getPath(), contentId);
    }
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Third-party tools

  1. Hutool’s MailUtil utility class encapsulates Javax. mail

    Pom.xml introduces javax.mail and hutool-extra or hutool-all

    <dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.7</version>
</dependency>
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-extra</artifactId>
    <version>5.4.5</version>
</dependency>
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    The resource/config/mail. Setting the configuration file

    # SMTP address of the mail server, optional, default is SMTP.
host = smtp.yeah.net
The SMTP port of the mail server is optional. Default is 25
port = 25
# the sender
from = [email protected]
The default user name is the sender email prefix
user = hutool
# password, some email addresses need to be set to authorization code
pass = xxxx
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    use

    MailUtil.send("[email protected]"."Test"."Mail Test".false);
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    Sending an email is very simple. There is only one method to do it. The parameters are described as follows:

    1. Tos: Email address of the other party, which can be single or multiple (Collection)
    2. Subject: title
    3. Content: Indicates the email body, which can be text or HTML
    4. IsHtml: whether it isHtml or not, if so, then parameter 3 identifies it as HTML content
    5. Files: Optional: Attachment, can be multiple or none, add File object to the last variable argument