Question

我可以直接发送QR码到电子邮件，而无需使用java进行任何本地存储工作吗？下面的代码生成QRcode。

public static void createQRCode(String qrCodeData, String filePath,
String charset, Map hintMap, int qrCodeheight, int qrCodewidth)
throws WriterException, IOException {
BitMatrix matrix = new MultiFormatWriter().encode(
    new String(qrCodeData.getBytes(charset), charset),
    BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight, hintMap);
MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
    .lastIndexOf('.') + 1), new File(filePath));
System.out.println("QR code encoded");
}

public static String readQRCode(String filePath, String charset, Map hintMap)
throws FileNotFoundException, IOException, NotFoundException {
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
    new BufferedImageLuminanceSource(
            ImageIO.read(new     FileInputStream(filePath)))));
Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap,
    hintMap);
return qrCodeResult.getText();
}

我想将以上生成的QR附加到正文部分中的以下代码，而不在本地存储。我正在使用eclipse Mars ..请帮帮我

String from = USER_NAME;
String pass = PASSWORD;
String[] to = {RECIPIENT};
String subject = "Java mail example";
String body= "hi this is tetsting mail!";


Properties props = System.getProperties();
String host = "smtp.gmail.com";

props.put("mail.smtp.starttls.enable", "true");

props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", pass);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");


Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);

try {


message.setFrom(new InternetAddress(from));
InternetAddress[] toAddress = new InternetAddress[to.length];

// To get the array of addresses
for( int i = 0; i < to.length; i++ ) {
   toAddress[i] = new InternetAddress(to[i]);
}

for( int i = 0; i < toAddress.length; i++) {
   message.addRecipient(Message.RecipientType.TO, toAddress[i]);
}

message.setSubject(subject);
message.setText(body, "UTF-8", "html");

Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
System.out.println("Email Sent successfully");

}
catch (AddressException ae) {
ae.printStackTrace();
}
catch (MessagingException me) {
me.printStackTrace();
}
}

Answer 1

Spring @Scheduled注释非常可靠，你也可以坚持执行以便更好地管理，但是你的应用程序必须偏离正常运行，否则你可以使用像https://github.com/rundeck/rundeck这样的其他东西

@Component
public class ScheduledTasks {

    private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

    (cron="*/5 * * * * MON-FRI")
    public void reportCurrentTime() {
        log.info("The time is now {}", dateFormat.format(new Date()));
    }
}

使用java将QRcode发送到电子邮件

1 个答案: