我正在嘗試發送帶有圖像附件的 Mime 電子郵件，但我知道如何執行此操作。我嘗試了在線解決方案，但沒有奏效。我會得到編碼的圖像，需要解碼并附在郵件中。這是我的代碼public class SendEmail{public static void main( String[] args ) throws javax.mail.MessagingException, IOException{      String value= "Wyk+HjAxHTAyNzg3MDUdODQwHTAxOR0wMDAwMDAwMDAwMDAwMDAd" +            "RkRFQh0wMDAwMDAwHTA0MB0dMS8xHTUwLjVMQh1OHVcgMzR0aCBTdHJlZXQdQ" +            "XVzdGluHVRYHSAeMDYdMTBaR0QwMDQdMTFaUmVjaXBpZW50IENvbXBhbnkgTmFt" +            "ZR0xMlo5MDEyNjM3OTA2HTE0WioqVEVTVCBMQUJFTCAtIERPIE5PVCBTSElQKio" +            "dMjNaTh0yMlocWR0yMFogHDAdMjZaNjEzMxwdHgQ=";           JavaMailSender mailSender = getJavaMailSender();    MimeMessage mimeMessage = mailSender.createMimeMessage();    MimeMessageHelper helper;    Map<String,Object> map = new HashMap<>();    try{        helper = new MimeMessageHelper(mimeMessage, true, "utf-8");        String sendTo = "[email protected]";        String htmlMsg = "<h1> hello </h1>";        mimeMessage.setContent(htmlMsg, "text/html");        // add attachment encode in base64        byte[] decodedImg  Base64.decodeBase64(value);        // dont know how to attache the decode img         helper.setTo(sendTo);        helper.setSubject("Subject");        mailSender.send(mimeMessage);    } catch (MessagingException e) {        e.printStackTrace();    }}