将文本文件打印到java中的特定打印机

Question

我有一个文本文件，我需要将它打印到特定的网络打印机。我知道打印机的名称。

到目前为止，我已经制作了一个 Printable 类来打印我的文件（票证）。

public class TicketPrintPage implements Printable {

    private File ticket;

    public TicketPrintPage(File f) {
        ticket = f;
    }

    public int print(Graphics g, PageFormat pf, int pageIndex) throws PrinterException {
        int interline = 12;
        Graphics2D g2 = (Graphics2D) g;
        g2.setFont(new Font("CourierThai", Font.PLAIN, 10));
        int x =  (int) pf.getImageableX();
        int y = (int) pf.getImageableY();

        try {
            FileReader fr = new FileReader(ticket);
            BufferedReader br = new BufferedReader(fr);

            String s;
            while ((s = br.readLine()) != null) {
                y += interline;
                g2.drawString(s, x, y);
            }
        } catch (IOException e) {
            throw new PrinterException("File to print does not exist (" + ticket.getAbsolutePath() +") !");
        }
        return Printable.PAGE_EXISTS;
    }
}

我这样称呼这个 TicketPrintPage ：

public void printTicketFile(File ticket, int orientation) throws PrinterException {
    if (!ticket.exists()) {
        throw new PrinterException("Ticket to print does not exist (" + ticket.getAbsolutePath() + ") !");
    }
    PrinterJob pjob = PrinterJob.getPrinterJob();
    // get printer using PrintServiceLookup.lookupPrintServices(null, null) and looking at the name
    pjob.setPrintService(getPrintService());
    // job title
    pjob.setJobName(ticket.getName());

    // page fomat
    PageFormat pf = pjob.defaultPage();
    // landscape or portrait
    pf.setOrientation(orientation);
    // Paper properties
    Paper a4Paper = new Paper();
    double paperWidth  =  8.26;
    double paperHeight = 11.69;
    double margin = 16;
    a4Paper.setSize(paperWidth * 72.0, paperHeight * 72.0);
    a4Paper.setImageableArea(
                margin,
                //0,
                margin,
                //0,
                a4Paper.getWidth()- 2 * margin,
                //a4Paper.getWidth(),
                a4Paper.getHeight()- 2 * margin
                //a4Paper.getHeight()
                ); // no margin = no scaling
    pf.setPaper(a4Paper);
    // Custom class that defines how to layout file text
    TicketPrintPage pages = new TicketPrintPage(ticket);
    // adding the page to a book
    Book book = new Book();
    book.append(pages, pf);
    // Adding the book to a printjob
    pjob.setPageable(book);
    PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        // No jobsheet (banner page, the page with user name, job name, date and whatnot)
    pras.add(JobSheets.NONE);
    // Printing
    pjob.print(pras);
}

效果还不错，但是:
- 我不能为超过一页的文本工作（找到了一些算法但很好）
- 我无法知道打印机何时完成打印，如果我尝试连续打印两张或多张票，打印机将返回打印机未就绪消息。

那么问题又来了：难道没有一种简单的方法可以将文本文件打印到打印机上吗？

Answer 1

JTextComponent#print 应该可以解决问题：

JTextPane jtp = new JTextPane();
jtp.setBackground(Color.white);
jtp.setText("text to print");
boolean show = true;
try {
    jtp.print(null, null, show, null, null, show);
} catch (java.awt.print.PrinterException ex) {
    ex.printStackTrace();
}

通过这种方式，您甚至可以快速打印出漂亮的格式化文本 - 只需在打印之前创建一个 StyledDocument 并将其附加到 JTextPane。

Answer 2

我不确定这是否能解决您的问题，但我使用以下内容打印文本文件

FileInputStream textStream;
textStream = new FileInputStream(FILE_NAME);

DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
Doc mydoc = new SimpleDoc(textStream, flavor, null);

   PrintService[] services = PrintServiceLookup.lookupPrintServices(
                flavor, aset);
   PrintService defaultService = PrintServiceLookup.lookupDefaultPrintService();

   if(services.length == 0) {
       if(defaultService == null) {
             //no printer found

       } else {
            //print using default
            DocPrintJob job = defaultService.createPrintJob();
            job.print(mydoc, aset);

       }

    } else {

       //built in UI for printing you may not use this
       PrintService service = ServiceUI.printDialog(null, 200, 200, services, defaultService, flavor, aset);


        if (service != null)
        {
           DocPrintJob job = service.createPrintJob();
           job.print(mydoc, aset);
        }

    }

您可能不需要 ServiceUI，但我认为您可以使用 PrintService[] 服务来获取可用于打印的打印机列表。并且使用输入流和 Doc 类，您可以将文件打印到打印机。