How to use Webman framework to send and receive emails?

How to use the Webman framework to implement email sending and receiving functions?

Webman is a Java-based Web development framework that provides rich features and tools to simplify the development process. In practical applications, the function of sending and receiving emails is one of the most common requirements. This article will introduce how to use the Webman framework to implement the function of sending and receiving emails, and attach code examples.

1. Import the required dependencies

First, we need to import the relevant dependencies in the project's pom.xml file. The following are the required dependencies:

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>javax.mail-api</artifactId>
    <version>1.6.2</version>
</dependency>
<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

2. Configuring parameters for email sending and receiving

In the project's configuration file (such as application.properties), we need to configure Parameters for sending and receiving emails, including SMTP server, port number, user name, password, etc. The following is a sample configuration:

# 邮件发送配置
mail.smtp.host=smtp.example.com
mail.smtp.port=587
mail.smtp.username=username@example.com
mail.smtp.password=your_password

# 邮件接收配置
mail.pop3.host=pop3.example.com
mail.pop3.port=995
mail.pop3.username=username@example.com
mail.pop3.password=your_password

Please note that this is just a sample configuration, you need to configure it according to your actual situation.

3. Write the code for sending emails

In the Webman framework, we can use the @Controller and @Route annotations to Define the processing interface for email sending. The following is an example:

@Controller
public class MailController {

    @Inject
    private MailService mailService;

    @Route(url = "/sendMail", method = HttpMethod.POST)
    public void sendMail(Request request, Response response) {
        String to = request.getParameter("to");
        String subject = request.getParameter("subject");
        String content = request.getParameter("content");

        mailService.sendMail(to, subject, content);

        response.ok();
    }
}

In the above example, we use the @Route annotation to map the /sendMail path to the sendMail method. In this method, we get the recipient address, subject and content from the request and send the email through mailService.

4. Write the code for receiving emails

Similar to sending emails, we can use the @Controller and @Route annotations to Define the processing interface for mail reception. The following is an example:

@Controller
public class MailController {

    @Inject
    private MailService mailService;

    @Route(url = "/receiveMail", method = HttpMethod.GET)
    public void receiveMail(Request request, Response response) {
        List<Mail> mails = mailService.receiveMail();

        response.json(mails);
    }
}

In the above example, we use the @Route annotation to map the /receiveMail path to the receiveMail method. In this method, we receive emails through mailService and return the results in JSON format.

5. Write the code of the mail service

The mail service is the core part of realizing the function of sending and receiving mails. Here is an example:

@Service
public class MailService {

    @Value("mail.smtp.host")
    private String smtpHost;

    @Value("mail.smtp.port")
    private int smtpPort;

    @Value("mail.smtp.username")
    private String smtpUsername;

    @Value("mail.smtp.password")
    private String smtpPassword;

    // 发送邮件
    public void sendMail(String to, String subject, String content) {
        // 创建邮件会话
        Properties properties = new Properties();
        properties.setProperty("mail.smtp.host", smtpHost);
        properties.setProperty("mail.smtp.port", String.valueOf(smtpPort));
        properties.setProperty("mail.smtp.auth", "true");

        Session session = Session.getInstance(properties, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(smtpUsername, smtpPassword);
            }
        });

        // 创建邮件消息
        Message message = new MimeMessage(session);
        try {
            message.setFrom(new InternetAddress(smtpUsername));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
            message.setSubject(subject);
            message.setText(content);

            // 发送邮件
            Transport.send(message);
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

    // 接收邮件
    public List<Mail> receiveMail() {
        // 创建邮件会话
        Properties properties = new Properties();
        properties.setProperty("mail.pop3.host", pop3Host);
        properties.setProperty("mail.pop3.port", String.valueOf(pop3Port));
        properties.setProperty("mail.pop3.ssl.enable", "true");

        Session session = Session.getInstance(properties);

        List<Mail> mails = new ArrayList<>();

        try {
            // 连接到邮件服务器
            Store store = session.getStore("pop3");
            store.connect(pop3Host, pop3Username, pop3Password);

            // 获取收件箱
            Folder folder = store.getFolder("INBOX");
            folder.open(Folder.READ_ONLY);

            // 遍历邮件
            for (Message message : folder.getMessages()) {
                Mail mail = new Mail();
                mail.setFrom(message.getFrom()[0].toString());
                mail.setTo(message.getRecipients(Message.RecipientType.TO)[0].toString());
                mail.setSubject(message.getSubject());
                mail.setContent(message.getContent().toString());

                mails.add(mail);
            }

            // 关闭文件夹和连接
            folder.close(false);
            store.close();
        } catch (MessagingException | IOException e) {
            e.printStackTrace();
        }

        return mails;
    }
}

In the above example, we used the @Service annotation to mark the MailService class as a service component. In this class, we obtain the configuration parameters by injecting the @Value annotation, and use the JavaMail API to implement the function of sending and receiving emails.

The above is a brief introduction and code examples of using the Webman framework to implement email sending and receiving functions. Through the above steps, you can quickly integrate email functions into your web application. Of course, this is just a simple example and you can extend and optimize it according to your needs. I wish you success!

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