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<dependency>
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    <groupId>com.sun.mail</groupId>
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    <artifactId>javax.mail</artifactId>
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    <version>1.6.2</version>
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</dependency>

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import lombok.Data;
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@Data
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public class SimpleMail {
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    private String[] to;
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    private String[] cc;
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    private String[] bcc;
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    private String from;
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    private String host;
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    private String port;
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    private String subject;
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    private String body;
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    private String[] attachment;
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    private String username;
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    private String password;
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    private Boolean isHtml;
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}

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import javax.activation.DataHandler;
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import javax.activation.DataSource;
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import javax.activation.FileDataSource;
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import javax.mail.*;
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import javax.mail.internet.*;
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import java.io.UnsupportedEncodingException;
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import java.util.*;
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public class MailUtils {
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    /**
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     * 发送邮件
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     * @param simpleMail
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     */
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    public static void sendMail(SimpleMail simpleMail) {
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        /** 获取系统属性 **/
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        Properties properties = System.getProperties();
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        /** 设置邮件服务器 **/
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        properties.setProperty("mail.smtp.host", simpleMail.getHost());
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        /** 设置邮件服务器端口 **/
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        properties.setProperty("mail.smtp.port", simpleMail.getPort());
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        /** 设置服务器验证为true **/
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        properties.put("mail.smtp.auth", "true");
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        /** 获取默认session对象 **/
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        Session session = Session.getDefaultInstance(properties, new Authenticator() {
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            // 设置提供的发件邮箱与给的邮箱授权码
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            public PasswordAuthentication getPasswordAuthentication() {
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                return new PasswordAuthentication(simpleMail.getUsername(), simpleMail.getPassword());
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            }
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        });
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        try {
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            /** 创建默认的 MimeMessage 对象 **/
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            MimeMessage message = new MimeMessage(session);
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            /** 设置发件人 **/
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            message.setFrom(new InternetAddress(simpleMail.getFrom()));
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            /** 设置收件人、抄送、密送 **/
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            List<InternetAddress> toList = new ArrayList<>();
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            List<InternetAddress> ccList = new ArrayList<>();
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            List<InternetAddress> bccList = new ArrayList<>();
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            if (simpleMail.getTo() != null) {
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                for (String str : simpleMail.getTo()) {
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                    toList.add(new InternetAddress(str));
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                }
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                message.addRecipients(Message.RecipientType.TO, toList.toArray(new InternetAddress[]{}));
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            }
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            if (simpleMail.getCc() != null) {
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                for (String str : simpleMail.getCc()) {
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                    toList.add(new InternetAddress(str));
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                }
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                message.addRecipients(Message.RecipientType.CC, ccList.toArray(new InternetAddress[]{}));
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            }
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            if (simpleMail.getBcc() != null) {
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                for (String str : simpleMail.getBcc()) {
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                    toList.add(new InternetAddress(str));
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                }
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                message.addRecipients(Message.RecipientType.BCC, bccList.toArray(new InternetAddress[]{}));
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            }
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            // 设置标题Subject
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            message.setSubject(simpleMail.getSubject());
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            //message.setText(simpleMail.getBody());
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            /** 创建消息部分 **/
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            // 创建消息体对象
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            BodyPart messageBodyPart = new MimeBodyPart();
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            // 创建多重消息对象
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            Multipart multipart = new MimeMultipart();
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            /** 设置消息 **/
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            //messageBodyPart.setText(simpleMail.getBody());
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            if (simpleMail.getIsHtml()) {
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                messageBodyPart.setContent(simpleMail.getBody(), "text/html;charset=utf-8");
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            } else {
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                messageBodyPart.setContent(simpleMail.getBody(), "text/plain;charset=utf-8");
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            }
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            // 添加到 multipart
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            multipart.addBodyPart(messageBodyPart);
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            /** 设置附件 **/
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            if (simpleMail.getAttachment()!=null){
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                for (String str:simpleMail.getAttachment()){
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                    messageBodyPart = new MimeBodyPart();
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                    DataSource source = new FileDataSource(str);
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                    messageBodyPart.setDataHandler(new DataHandler(source));
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                    // 设置文件名
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                    System.out.println(str);
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                    messageBodyPart.setFileName(MimeUtility.encodeText(str.substring(str.lastIndexOf("/")+1)));
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                    // 添加到 multipart
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                    multipart.addBodyPart(messageBodyPart);
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                }
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            }
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            /** 设置消息内容与附件 **/
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            message.setContent(multipart);
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            /** 发送消息 **/
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            Transport.send(message);
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            System.out.println("发送成功！");
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        } catch (MessagingException | UnsupportedEncodingException mex) {
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            mex.printStackTrace();
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        }
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    }
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}

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    public static void main(String[] args) {
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        /** 1、设置发送邮件内容对象 **/
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        SimpleMail simpleMail = new SimpleMail();
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        // 指定发送邮件的服务器地址
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        simpleMail.setHost("smtp.163.com");
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        // 指定发送邮件服务器的端口
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     simpleMail.setPort("25");
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        // 收件人电子邮箱
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        simpleMail.setTo(new String[]{"32******7@qq.com", "mydlq.club@gmail.com"});
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        // 收件人抄送
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        simpleMail.setCc(new String[]{"123456789@qq.com"});
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        // 收件人密送
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        simpleMail.setTo(new String[]{"111111111@qq.com"});
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        // 发件人电子邮箱
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        simpleMail.setFrom("m*******lq@163.com");
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        // 邮件主题
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        simpleMail.setSubject("测试邮件");
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        // 邮件内容
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        //simpleMail.setBody("这是一封测试邮件");
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        simpleMail.setBody("<html>" +
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                              "<p>主题：测试</p>" +
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                              "<p>结果：签到人数：xxx</p>" +
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                           "</html>");
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        // 是否为 HTML 格式邮件
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        simpleMail.setIsHtml(true);
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        // 邮件附件
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        simpleMail.setAttachment(new String[]{"d://非签到表.xlsx", "d://签到表.xlsx"});
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        // 设置发件邮箱的用户名、验证码
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        simpleMail.setUsername("m******lq@163.com");
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        simpleMail.setPassword("a*******0");
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        /** 2、调用方法发送邮件 **/
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        // 发送邮件测试
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        sendMail(simpleMail);
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    }