一、到相關郵箱伺服器開通smtp等功能

二、程式碼編寫

import java.util.Date;
import java.util.Properties;

import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress
 
;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

import com.jfinal.kit.Prop;
import com.jfinal.kit.PropKit;

public class EmailKit {

    /**
     * FIXME smtp地址需改成配置項，郵件正文程式碼略微複雜應可簡化
     * @param toEmail 目標郵箱
     * @param title 郵件主題
     * @param content 郵件內容
     */
 

    public static boolean send(String toEmail, String title, String content) {


        boolean flag = true;
        try {
            Prop emailProp = PropKit.use("email.properties");
            String fromEmail = emailProp.get("fromEmail");

            Properties props = new Properties();
            props.put
 
("mail.smtp.host", emailProp.get("smtpHost"));
            props.put("mail.smtp.auth", "true"); // 這樣才能通過驗證

            //ssl 驗證  部分非企業郵箱
            props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            props.setProperty("mail.smtp.port", "465");
            props.setProperty("mail.smtp.socketFactory.port", "465");

            Session s = Session.getInstance(props);
            s.setDebug(true);

            MimeMessage message = new MimeMessage(s);

            // 給訊息物件設定發件人/收件人/主題/發信時間
            InternetAddress from = new InternetAddress(fromEmail); // 發郵件的出發地（發件人的信箱）
            message.setFrom(from);
            InternetAddress to = new InternetAddress(toEmail);// 發郵件的目的地（收件人信箱）
            message.setRecipient(Message.RecipientType.TO, to);
            message.setSubject(title);
            message.setSentDate(new Date());



            // 給訊息物件設定內容
            BodyPart mdp = new MimeBodyPart();// 新建一個存放信件內容的BodyPart物件
            mdp.setContent(content, "text/html;charset=gb2312");// 給BodyPart物件設定內容和格式/編碼方式
            Multipart mm = new MimeMultipart();// 新建一個MimeMultipart物件用來存放BodyPart物件(事實上可以存放多個)
            mm.addBodyPart(mdp);// 將BodyPart加入到MimeMultipart物件中(可以加入多個BodyPart)
            message.setContent(mm);// 把mm作為訊息物件的內容

            message.saveChanges();
            Transport transport = s.getTransport("smtp");
            transport.connect(emailProp.get("smtpHost"), fromEmail, emailProp.get("fromPassword"));
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();

        } catch (MessagingException e) {
            e.printStackTrace();
            flag = false;
        }
        return flag;

    }

}