Question

我在我的java页面上放了两个按钮来打印和发送电子邮件。我已经解决了电子邮件要求

    if (e.getSource().equals(btnEmail)){
        dialog.setVisible(true); // to visible the dialog
        try {
            Robot robot = new Robot();
            String format = "jpg";
            final String fileName = "C:\\xxxxxxxx--" + format;
            Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
            BufferedImage screenFullImage = robot.createScreenCapture(screenRect);
            File file = new File(fileName);  
            ImageIO.write(screenFullImage, format, file);

            while (true){
                boolean exists = file.exists();  
                if (!exists){        // It returns false if File or directory does not exist 
                    return;
                } else {
                    String to = "xxxx@hotmail.com";
                    String username = "xxxx@gmail.com";
                    final String password = "xxxx";

                    //Get the session object  
                    Properties props = new Properties();
                    props.put("mail.smtp.host", "smtp.gmail.com");
                    props.put("mail.smtp.socketFactory.port", "465");
                    props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
                    props.put("mail.smtp.auth", "true");
                    props.put("mail.smtp.port", "465");

                    Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
                        protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(username, password);//change accordingly  
                        }
                    });

                    try {
                        Message message = new MimeMessage(session);
                        message.setFrom(new InternetAddress(username));
                        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
                        message.setSubject("Printout from Java Exe");
                        BodyPart messageBodyPart = new MimeBodyPart();
                        messageBodyPart.setText("Printout");
                        Multipart multipart = new MimeMultipart();
                        multipart.addBodyPart(messageBodyPart);
                        // Part two is attachment
                        messageBodyPart = new MimeBodyPart();
                        DataSource source = new FileDataSource(file);
                        messageBodyPart.setDataHandler(new DataHandler(source));
                        messageBodyPart.setFileName(file.getName());
                        multipart.addBodyPart(messageBodyPart);
                        // Send the complete message parts
                        message.setContent(multipart);
                         // Send message
                        Transport.send(message);

                        System.out.println("Sent message successfully....");

                    } catch (MessagingException e ?????1) {
                        throw new RuntimeException(e1);
                    }

                    break;
                }
            }
        } catch (AWTException | IOException ex) {
            System.err.println(ex);
        }
        dialog.setVisible(false); // set visibility to false
 } else if (e.getSource().equals(btnPrint)){

// This is where I'm stuck - Should be easy - just output a JPEG from disk to Printer ?????
 }

这就是我被困的地方 - 应该很容易 - 只需将JPEG从磁盘输出到打印机?????

Answer 1

我已经使用了这个程序，它调用了对话框 - 我没有打印机，所以试着看看它是否实际打印 - 用bim代替screenFullImage：

class HelloWorldPrinter implements Printable, ActionListener {


public int print(Graphics g, PageFormat pf, int page) throws
                                                    PrinterException {

    if (page > 0) { /* We have only one page, and 'page' is zero-based */
        return NO_SUCH_PAGE;
    }

    /* User (0,0) is typically outside the imageable area, so we must
     * translate by the X and Y values in the PageFormat to avoid clipping
     */
    Graphics2D g2d = (Graphics2D)g;
    g2d.translate(pf.getImageableX(), pf.getImageableY());

    /* Now we perform our rendering */
//        g.drawString("Hello world!", 100, 100);
BufferedImage bim=null;
try {
  bim=ImageIO.read(new File("../black.jpg"));
}
catch (Exception ex) { System.err.println("error in bim "+ex); }

g.drawImage(bim, 0, 0, null);

    /* tell the caller that this page is part of the printed document */
    return PAGE_EXISTS;
}

public void actionPerformed(ActionEvent e) {
     PrinterJob job = PrinterJob.getPrinterJob();
     job.setPrintable(this);
     boolean ok = job.printDialog();
     if (ok) {
         try {
              job.print();
         } catch (PrinterException ex) {
          /* The job did not successfully complete */
         }
     }
}

public static void m() {

    UIManager.put("swing.boldMetal", Boolean.FALSE);
    JFrame f = new JFrame("Hello World Printer");
    f.addWindowListener(new WindowAdapter() {
       public void windowClosing(WindowEvent e) {System.exit(0);}
    });
    JButton printButton = new JButton("Print Hello World");
    printButton.addActionListener(new HelloWorldPrinter());
    f.add("Center", printButton);
    f.pack();
    f.setVisible(true);
}

}

-

更改

public static void m() {

到

public static void main(String[] args) {

和

BufferedImage bim=null;
try {
  bim=ImageIO.read(new File("...")); // fill in whatever name the file is saved in the whole path e.g. c:/mypath/filename
}
catch (Exception ex) { System.err.println("error in bim "+ex); }

g.drawImage(bim, 0, 0, null);

要打印较小尺寸的图像，请尝试使用

BufferedImage b0=new BufferedImage(bim.getWidth()/2, bim.getHeight()/2, BufferedImage.TYPE_INT_RGB);
Graphics g0=b0.getGraphics();
g0.drawImage(bim, b0.getWidth(), b0.getHeight(), null);

现在打印此图片而不是bim：

g.drawImage(b0, 0, 0, null);

Java从磁盘打印JPEG

1 个答案: