springboot如何发送一封带附件的邮件呢?

下文笔者讲述使用springboot发送带附件的邮件的方法分享,如下所示
今天接到一个需求,每次任务运行完毕后,都向指定邮箱发送一封带附件的邮件，下文笔者将讲述具体的实现方法,如下所示

实现思路:
    只需使用javax.mail包
	即可实现发送邮件

例：SpringBoot发送带附件的邮件

导入相应的jar包

 
<!-- https://mvnrepository.com/artifact/javax.activation/activation -->
<dependency>
	<groupId>javax.activation</groupId>
	<artifactId>activation</artifactId>
	<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
	<groupId>javax.mail</groupId>
	<artifactId>mail</artifactId>
	<version>1.4</version>
</dependency>

添加配置信息

#smtp服务器
PSBC_MAIL_HOST=smtp.google.com
#身份验证 我这儿暂时用不到
PSBC_MAIL_AUTH=false
#邮件发件人
PSBC_MAIL_SENDER=admin@google.com
#邮件收件人
PSBC_MAIL_RECIPIENT=admin@java265.com

发送邮件Utils类

public class MailUtil {
    private MimeMessage message;
    private Session session;
    private Transport transport;

    private String mailHost = "smtp.google.com";
    private String sender_username = "admin@google.com";
    private String sender_password = "";

    private Properties properties = new Properties();

    /***
     * 重写初始化加载方法 
     *
     */
    public MailUtil(boolean debug,String mailHost,String senderUsername) {
        this.mailHost = mailHost;
        this.sender_username = senderUsername;
        this.sender_password = sender_password;

        session = Session.getInstance(properties);
        session.setDebug(debug);// 开启后有调试信息
        message = new MimeMessage(session);
    }
   /***
     * 将发送邮件增加返回值 
     *
     */
    public boolean doSendEmail(String subject, String sendHtml, String receiveUser, File attachment) {
        boolean status = false;
        try {
            // 发件人
            InternetAddress from = new InternetAddress(sender_username);
            message.setFrom(from);

            // 多个收件人
            String[] addressArr = receiveUser.split(";");
            InternetAddress[] toAddress = new InternetAddress[addressArr.length];
            for (int i = 0; i < addressArr.length; i++) {
                toAddress[i] = new InternetAddress(addressArr[i]);
            }
            message.setRecipients(Message.RecipientType.TO, toAddress);

            //单个收件人
            //InternetAddress to = new InternetAddress(receiveUser);
            //message.setRecipient(Message.RecipientType.TO, to);

            // 邮件主题
            message.setSubject(subject);

            // 向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
            Multipart multipart = new MimeMultipart();

            // 添加邮件正文
            BodyPart contentPart = new MimeBodyPart();
            contentPart.setContent(sendHtml, "text/html;charset=UTF-8");
            multipart.addBodyPart(contentPart);

            // 添加附件的内容
            if (attachment != null) {
                BodyPart attachmentBodyPart = new MimeBodyPart();
                DataSource source = new FileDataSource(attachment);
                attachmentBodyPart.setDataHandler(new DataHandler(source));

                // 网上流传的解决文件名乱码的方法，其实用MimeUtility.encodeWord就可以很方便的搞定
                // 这里很重要，通过下面的Base64编码的转换可以保证你的中文附件标题名在发送时不会变成乱码
                //sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
                //messageBodyPart.setFileName("=?GBK?B?" + enc.encode(attachment.getName().getBytes()) + "?=");

                //MimeUtility.encodeWord可以避免文件名乱码
                attachmentBodyPart.setFileName(MimeUtility.encodeWord(attachment.getName()));
                multipart.addBodyPart(attachmentBodyPart);
            }

            // 将multipart对象放到message中
            message.setContent(multipart);
            // 保存邮件
            message.saveChanges();

            transport = session.getTransport("smtp");
            // smtp验证，就是你用来发邮件的邮箱用户名密码
            transport.connect(mailHost, sender_username, sender_password);
            // 发送
            transport.sendMessage(message, message.getAllRecipients());

            //System.out.println("send success!");
            status=true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (transport != null) {
                try {
                    transport.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
        return status;
    }

 
   //测试代码
	public static void main(String[] args) {
        String mailHost="smtp.google.com";
        String senderUsername="admin@google.com";
        MailUtil se = new MailUtil(false,mailHost,senderUsername);
        File fileAttach = new File("D:\\Test\\test.txt");
        boolean status = se.doSendEmail("邮件主题20230223", "这里是邮件内容", "admin@google.com;test888@google.com", fileAttach);//
        System.out.println(status);
    }
}