【javaMail】java发送带附件邮件

package com.example.mail;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.Properties;

public class SendMail {
    // 收件人电子邮箱
    private static final String to = "******@qq.com";
    // 发件人电子邮箱
    private static final String from = "******@******.com";
    private static final String from_name = "********";
    // 指定发送邮件的主机为 smtp.qq.com
    private static final String host = "*********";
    private static final String user_name = "*********";
    private static final String pwd = "********";
    private static final String subject = "邮件主题";

    public static void main(String[] args) throws GeneralSecurityException, UnsupportedEncodingException {
        // 获取系统属性
        Properties properties = System.getProperties();
        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);
        properties.put("mail.smtp.auth", "true");
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {  //qq邮箱服务器账户、第三方登录授权码
                return new PasswordAuthentication(user_name, pwd); //发件人邮件用户名、密码
            }
        });
        try {
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);
            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));
            message.setFileName(from_name);
            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            // Set Subject: 主题文字
            message.setSubject(subject);
            // 创建消息部分
            BodyPart messageBodyPart = new MimeBodyPart();
            // 消息
            messageBodyPart.setText("233333333333333");
            // 创建多重消息
            Multipart multipart = new MimeMultipart();
            // 设置文本消息部分
            multipart.addBodyPart(messageBodyPart);
            // 附件部分
            messageBodyPart = new MimeBodyPart();
            //设置要发送附件的文件路径
            String filename = "C:\\Users\\lwz\\Desktop\\********.xlsx";
            DataSource source = new FileDataSource(filename);
            messageBodyPart.setDataHandler(new DataHandler(source));
            //messageBodyPart.setFileName(filename);
            //处理附件名称中文（附带文件路径）乱码问题
            messageBodyPart.setFileName(MimeUtility.encodeText(filename));
            multipart.addBodyPart(messageBodyPart);
            // 发送完整消息
            message.setContent(multipart);
            // 发送消息
            Transport.send(message);
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
}