Java gets the content of the latest email of QQ mailbox

Preconditions

Open the authorization code of the qq mailbox and log in with the authorization code.

maven

 <!-- https://mvnrepository.com/artifact/javax.mail/mail -->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.15.3</version>
        </dependency>

Code sample

QQ content Class

public class QqEmailContent {
    private String subject; // mailbox subject
    private String from; // email sender
    private String content; // mailbox content

    public QqEmailContent(String subject, String from, String content) {
        this.subject = subject;
        this.from = from;
        this. content = content;
    }

    public QqEmailContent() {
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this. content = content;
    }

    @Override
    public String toString() {
        return "QqEmailContent{" +
                "subject='" + subject + '\'' +
                ", from='" + from + '\'' +
                ", content='" + content + '\'' +
                '}';
    }
}

Get the latest email from QQ mailbox, and change the service “smtp.qq.com” and port according to your own needs. By default, encryption is turned off

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import javax.mail.*;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class QQEmailUtils {
    protected static String username = "[email protected]"; // use QQ mailbox account
    protected static String password = "xxxx"; // use authorization code

    public static QqEmailContent getFistMailContent() {
        QqEmailContent qqEmailContent = new QqEmailContent();
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.starttls.enable", "false"); // turn off TLS encryption
        props.put("mail.smtp.ssl.enable", "false"); // Turn off SSL encryption

        Session session = Session. getInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Store store = session.getStore("imap"); // use IMAP protocol
            store.connect("imap.qq.com", username, password); // connect to the IMAP server

            Folder inbox = store. getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);

            int messageCount = inbox.getMessageCount(); // Get the total number of messages
            Message[] messages = inbox.getMessages(messageCount, messageCount); // Get the latest email

            for (Message message : messages) {
                qqEmailContent.setSubject(message.getSubject());
                qqEmailContent.setFrom(String.valueOf(message.getFrom()[0]));
                qqEmailContent.setContent(parseRelatedMessage((MimeMessage) message));
                return qqEmailContent;

            }
            inbox. close(false);
            store. close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return null;
    }

    public static String parseRelatedMessage(MimeMessage message) throws Exception {
        Multipart multipart = (Multipart) message. getContent();
        String mainContent = null;
        for (int i = 0; i < multipart. getCount(); i ++ ) {
            BodyPart bodyPart = multipart. getBodyPart(i);
            if (bodyPart. getContentType(). toLowerCase(). contains("related")) {
                // get body content
                mainContent = getText(bodyPart);
                assert mainContent != null;
                Document doc = null;
                try {
                    doc = Jsoup. parse(mainContent);
                } catch (Exception e) {
                    return mainContent;
                }
                mainContent = doc. text();
            }
        }
        return mainContent;
    }

    private static String getText(BodyPart bodyPart) throws Exception {
        if (bodyPart. getContent() instanceof String) {
            return (String) bodyPart. getContent();
        } else if (bodyPart. getContent() instanceof Multipart) {
            StringBuilder sb = new StringBuilder();
            Multipart multipart = (Multipart) bodyPart. getContent();
            for (int i = 0; i < multipart. getCount(); i ++ ) {
                BodyPart part = multipart. getBodyPart(i);
                if (part.getDisposition() == null & amp; & amp; (part.getContentType().contains("TEXT/PLAIN") || part.getContentType().contains("TEXT/HTML" ))) {
                    sb.append(part.getContent().toString());
                }
            }
            return sb.toString();
        }
        return null;
    }

    public static void main(String[] args) {
        System.out.println(getFistMailContent());
    }
}

Actual running verification

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