java - 打印 JTextArea 换页字符作为分页符

Question

我正在尝试使用 Java 打印服务 API 打印 JTextArea:

        BufferedReader br = new BufferedReader(new FileReader(new File(path)));
        JTextArea text = new JTextArea();
        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        PrintService defaultService = PrintServiceLookup.lookupDefaultPrintService();

        text.read(br, null);
        text.print(null, null, true, defaultService, pras, true);

JTextArea 是从包含换页字符 (\f) 的文件加载的。如何让这些字符在我的本地打印机上充当分页符？

Answer 1

public class PagedTextArea extends JTextArea implements Printable, Pageable {
    JTextArea singlePageTextArea;

    @Override
    public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
                throws PrinterException {
        if (singlePageTextArea == null) {

            // Copy attributes to the singlePageTextArea:
            singlePageTextArea = new JTextArea();
            singlePageTextArea.setBounds(getBounds());
        }

        String[] pages = getText().split("\f");
        if (pageIndex >= pages.length) {
            return Printable.NO_SUCH_PAGE;
        }
        singlePageTextArea.setText(pages[pageIndex]);
        singlePageTextArea.printAll(graphics);
        return Printable.PAGE_EXISTS;
    }


    @Override
    public int getNumberOfPages() {
        String[] pages = getText().split("\f");
        return pages.length;
    }

    @Override
    public PageFormat getPageFormat(int pageIndex) throws IndexOutOfBoundsException {
        return new PageFormat();
    }

    @Override
    public Printable getPrintable(int pageIndex) throws IndexOutOfBoundsException {
        return this;
    }
}

并打印:

            PrinterJob job = PrinterJob.getPrinterJob();
            job.setPrintable(pagedTextArea);
            PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();

            boolean ok = job.printDialog(pras);
            if (ok) {
                System.out.println("Printing...");
                try {
                    job.print();
                } catch (PrinterException ex) {
                    System.out.println("The job did not successfully complete");
                }
            } else {
                System.out.println("Could not print");
            }

您可能想使用 PageFormat 对页面的 x、y 执行 Graphics2D.translate。