JavaMail筆記

如何在java中發送郵件？我這裏參考的是JavaMail開源項目

依賴jar包：java.mail.jar 點擊下載

普通郵件發送

測試用的是163郵箱，測試郵件發多了就報554了被識別爲垃圾郵件–!

import com.sun.mail.smtp.SMTPTransport;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

    public static void main(String[] args) {
        try {
            sendEmail("出塞", "秦時明月漢時關，萬里長征人未還", "[email protected]");
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @param subject 郵件主題
     * @param text 郵件內容
     * @param to 收件人
     * @throws GeneralSecurityException
     * @throws MessagingException
     */
    private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
        String mailer   = "Microsoft Outlook Express 6.00.2900.2869"; // 發信客戶端
        String mailhost = "smtp.163.com"; // smtp服務器
        String port     = "25"; // 默認端口爲25
        String user     = "[email protected]"; // 郵箱賬號
        String password = "xxx"; // 郵箱密碼

        // 1、郵件會話實例
        Properties props = new Properties();        // 屬性設置
        props.put("mail.smtp.host", mailhost);
        props.put("mail.smtp.auth", "true");

        Session session = Session.getInstance(props, null);
        session.setDebug(true);

        // 2、郵件消息內容封裝
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(user));
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
        msg.setSubject(subject);
        msg.setText(text);
        msg.setHeader("X-Mailer", mailer);
        msg.setSentDate(new Date());

        // 3、連接服務器併發送郵件
        SMTPTransport t = (SMTPTransport) session.getTransport();
        try {
            t.connect(user, password);
            t.sendMessage(msg, msg.getAllRecipients());
        } finally {
            t.close();
        }

        System.out.println("\nMail was sent successfully.");
    }
}

SSL加密

測試用了163和sina的郵箱都成功了

import com.sun.mail.smtp.SMTPTransport;
import com.sun.mail.util.MailSSLSocketFactory;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

    public static void main(String[] args) {
        try {
            sendEmail("出塞", "秦時明月漢時關，萬里長征人未還", "[email protected]");
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

    private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
        String mailer   = "Microsoft Outlook Express 6.00.2900.2869"; // 發信客戶端
        String mailhost = "smtp.sina.com";
        String port     = "465";
        String user     = "[email protected]"; // 郵箱賬號
        String password = "xxx"; // 郵箱密碼

        // 屬性設置
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", mailhost);
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.port", port);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.ssl.enable", "true"); // 啓用SSL
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        props.put("mail.smtp.ssl.socketFactory", sf); // 信任證書

        // 1、郵件會話
        Session session = Session.getInstance(props, null);
        session.setDebug(true);

        // 2、郵件內容
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(user));
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
        msg.setSubject(subject);
        msg.setText(text);
        msg.setHeader("X-Mailer", mailer);
        msg.setSentDate(new Date());

        // 3、連接服務器
        SMTPTransport t = (SMTPTransport) session.getTransport();
        try {
            t.connect(user, password);
            t.sendMessage(msg, msg.getAllRecipients());
        } finally {
            t.close();
        }

        System.out.println("\nMail was sent successfully.");
    }
}

STARTTLS加密

測試用的是微軟outlook郵箱發送成功

import com.sun.mail.smtp.SMTPTransport;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

    public static void main(String[] args) {
        try {
            sendEmail("出塞", "秦時明月漢時關，萬里長征人未還", "[email protected]");
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

    private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
        String mailer   = "Microsoft Outlook Express 5.50.4807.1700"; // 發信客戶端
        String user     = "[email protected]"; // 郵箱賬號
        String password = "xxx"; // 郵箱密碼

        // 屬性設置
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp-mail.outlook.com"); // 微軟outlook smtp服務器
        props.put("mail.smtp.port", "587");

        // 1、郵件會話
        Session session = Session.getInstance(props, null);
        session.setDebug(true); // 設置打印日誌

        // 2、郵件內容
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(user));
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
        msg.setSubject(subject);
        msg.setText(text);
        msg.setHeader("X-Mailer", mailer);
        msg.setSentDate(new Date());

        // 3、連接服務器
        SMTPTransport t = (SMTPTransport) session.getTransport();
        try {
            t.connect(user, password);
            t.sendMessage(msg, msg.getAllRecipients());
        } finally {
            t.close();
        }

        System.out.println("\nMail was sent successfully.");
    }
}

注：有些郵箱可能需要去官網設置smtp狀態，因爲可能默認沒有開啓smtp支持；並且smtp服務器的具體地址一般在郵箱官網設置裏尋找；

參考

http://www.oracle.com/technetwork/java/javamail/index.html
https://javaee.github.io/javamail/