javamail send email demo (text and attachments)

package com.get.one;
 import javax.mail.BodyPart;
 import javax.mail.Message;
 import javax.mail.Multipart;
 import javax.mail.Session;
 import javax.mail.Transport;
 import javax.mail.internet.* ;
 import java.util.* ;
 import javax.activation.* ;
 public  class test7 {
     // Sender's email and password (replace with your own email and password) 
    public  static String myEmailAccount = "***@qq.com " ;
     public  static String myEmailPassword = "******" ;
     public static  class MailUtils {

        private String host = ""; // smtp server 
        private String from = ""; // sender address 
        private String to = ""; // recipient address 
        private String affix = ""; // attachment address 
        private String affixName = ""; // Attachment name 
        private String user = ""; // User name 
        private String pwd = ""; // Password 
        private String subject = ""; // Mail header 
        private String msg = ""; // content of email
        
        public String getMsg() {
            return msg;
        }

        public void setMsg(String msg) {
            this.msg = msg;
        }

        public void setAddress(String from, String to, String subject) {
            this.from = from;
            this.to = to;
            this.subject = subject;
        }

        public void setAffix(String affix, String affixName) {
            this.affix = affix;
            this.affixName = affixName;
        }

        public void send(String host, String user, String pwd) {
            this.host = host;
            this.user = user;
            this.pwd = pwd;

            Properties props = new Properties();

            // Set the properties of the mail server that sends emails (using Netease's smtp server here) 
            props.put("mail.smtp.host" , host);
             // Requires authorization, that is, the verification of username and password, so that To pass the verification (must have this one) 
            props.put("mail.smtp.auth", "true");             // Requires authentication 
            props.put("mail.smtp.port", "465" );
            props.put("mail.smtp.socketFactory.port", "465");  
            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");   
            props.put( "mail.smtp.socketFactory.fallback", "false" ); 
             // Build a session with the props object just set 
            Session session = Session.getDefaultInstance(props);

            // With this sentence, the process information can be displayed at the console during the process of sending mail for debugging.
             // Use (you can see the process of sending mail on the console (console)) 
            session.setDebug( true ) ;

            // Define message object with session as parameter 
            MimeMessage message = new MimeMessage(session);
             try {
                 // Load sender address 
                message.setFrom( new InternetAddress(from));
                 // Load recipient address 
                message.addRecipient(Message .RecipientType.TO, new InternetAddress(to));
                 // load title 
                message.setSubject(subject);

                // Add various parts of the mail to the multipart object, including text content and attachments 
                Multipart multipart = new MimeMultipart();

                // Set the text content of the email 
                BodyPart contentPart = new MimeBodyPart();
                contentPart.setText(msg);
                multipart.addBodyPart(contentPart);
                if(!affix.equals("")) {
                    // 添加附件
                    BodyPart messageBodyPart = new MimeBodyPart();
                    DataSource source = new FileDataSource(affix);
                     // Add the content of the attachment 
                    messageBodyPart.setDataHandler( new DataHandler(source));
                  // Add the title of the attachment
                     // This is very important, through the following Base64 encoding conversion, you can guarantee your Chinese Attachment header name will not become garbled when sending 
                    sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
                    messageBodyPart.setFileName("=?GBK?B?"
                            + enc.encode(affixName.getBytes()) + "?=");
                    multipart.addBodyPart(messageBodyPart);
                };
                // Put the multipart object into the message 
                message.setContent(multipart);
                 // Save the mail 
                message.saveChanges();
                 // Send the mail 
                Transport transport = session.getTransport("smtp" );
                 // Connect to the server's mailbox 
                transport. connect(host, user, pwd);
                 // Send the mail out 
                transport.sendMessage(message, message.getAllRecipients());
                transport.close();
            } catch (Exception e) {
                e.printStackTrace ();
            }
        }

        public static void main(String[] args) {
            MailUtils cn = new MailUtils();
             // Set sender address, recipient address and email header 
            cn.setAddress("***@qq.com", "***@qq.com", "A with Attachment's JavaMail mail" );
             // Set the text content to be sent 
            cn.setMsg("This is the content" );
             // Set the location and title of the attachment to be sent
             // cn.setAffix("C:/kms10.log ", "kms10.log");
            
            /**
             * Set the account and password of the smtp server and mailbox
             * Mailbox must enable POP3/SMTP service and IMAP/SMTP service
             * Because the program belongs to third-party login, the login password must use the authorization code  
             */ 
            // Note: [The authorization code is different from your usual login password] 
            cn.send("smtp.qq.com" , myEmailAccount, myEmailPassword);

        }
    }
}