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Wie druckt man Strings mit Zeilenumbrüchen in Java?

Ich muss eine Zeichenfolge mit Java drucken, so dass ich die folgende Lösung finde. Ich habe einige Änderungen vorgenommen, um die Zeichenfolge zu drucken, ohne das Druckdialogfeld anzuzeigen. Mein Problem ist, obwohl diese Methode die Zeichenfolge korrekt ausgibt, bricht sie die Zeilen nicht, wie ich sie definiert habe. Bitte sagen Sie mir, wie Sie Strings mit Zeilenumbrüchen drucken. 

public class PrintBill implements Printable {

    private static final String mText = "SHOP MA\n"
            + "----------------------------\n"
            + "Pannampitiya\n"
            + "09-10-2012 harsha  no: 001\n"
            + "No  Item  Qty  Price  Amount\n"
            + "1 Bread 1 50.00  50.00\n"
            + "____________________________\n";

    private static final AttributedString mStyledText = new AttributedString(mText);

    static public void main(String args[]) throws PrinterException {
        PrinterService ps = new PrinterService();
        PrintService pss = ps.getCheckPrintService("Samsung-ML-2850D-2");//get the printer service by printer name


        PrinterJob printerJob = PrinterJob.getPrinterJob();
        printerJob.setPrintService(pss);

        Book book = new Book();
        book.append(new PrintBill(), new PageFormat());       

        printerJob.setPageable(book);


        try {
            printerJob.print();
            System.out.println(printerJob.getPrintService().getName());
            System.out.println("Print compleated..");
        } catch (PrinterException exception) {
            System.err.println("Printing error: " + exception);
            exception.printStackTrace();
        }

    @Override
    public int print(Graphics g, PageFormat format, int pageIndex) {
        Graphics2D g2d = (Graphics2D) g;

        g2d.translate(format.getImageableX(), format.getImageableY());

        g2d.setPaint(Color.black);        

        Point2D.Float pen = new Point2D.Float();
        AttributedCharacterIterator charIterator = mStyledText.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(charIterator, g2d.getFontRenderContext());
        float wrappingWidth = (float) format.getImageableWidth();

        while (measurer.getPosition() < charIterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            pen.y += layout.getAscent();
            float dx = layout.isLeftToRight() ? 0 : (wrappingWidth - layout.getAdvance());
            layout.draw(g2d, pen.x + dx, pen.y);
            pen.y += layout.getDescent() + layout.getLeading();

        }
        return Printable.PAGE_EXISTS;
    }
}

klasse für Druckerservice

public class PrinterService {

    public PrintService getCheckPrintService(String printerName) {
        PrintService ps = null;
        DocFlavor doc_flavor = DocFlavor.STRING.TEXT_PLAIN;
        PrintRequestAttributeSet attr_set =
                new HashPrintRequestAttributeSet();

        attr_set.add(new Copies(1));
        attr_set.add(Sides.ONE_SIDED);
        PrintService[] service = PrintServiceLookup.lookupPrintServices(doc_flavor, attr_set);

        for (int i = 0; i < service.length; i++) {
            System.out.println(service[i].getName());
            if (service[i].getName().equals(printerName)) {
                ps = service[i];
            }
        }
        return ps;
    }
}
6
Harsha

OK, endlich habe ich eine gute Lösung für meine Druckaufgabe gefunden und sie funktioniert einwandfrei.

Diese Klasse stellt den Druckservice bereit

public class PrinterService {

    public PrintService getCheckPrintService(String printerName) {
        PrintService ps = null;
        DocFlavor doc_flavor = DocFlavor.STRING.TEXT_PLAIN;
        PrintRequestAttributeSet attr_set =
                new HashPrintRequestAttributeSet();

        attr_set.add(new Copies(1));           
        attr_set.add(Sides.ONE_SIDED);
        PrintService[] service = PrintServiceLookup.lookupPrintServices(doc_flavor, attr_set);

        for (int i = 0; i < service.length; i++) {
            System.out.println(service[i].getName());
            if (service[i].getName().equals(printerName)) {
                ps = service[i];
            }
        }
        return ps;
    }
}

Diese Klasse demonstriert die Rechnungsdruckaufgabe.

public class HelloWorldPrinter implements Printable {

    @Override
    public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
        if (pageIndex > 0) { /* We have only one page, and 'page' is zero-based */
            return NO_SUCH_PAGE;
        }

        Graphics2D g2d = (Graphics2D) graphics;
        g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());

        //the String to print in multiple lines
        //writing a semicolon (;) at the end of each sentence
        String mText = "SHOP MA;"
                + "Pannampitiya;"
                + "----------------------------;"
                + "09-10-2012 harsha  no: 001 ;"
                + "No  Item  Qty  Price  Amount ;"
                + "----------------------------;"
                + "1 Bread 1 50.00  50.00 ;"
                + "----------------------------;";

        //Prepare the rendering
        //split the String by the semicolon character
        String[] bill = mText.split(";");
        int y = 15;
        Font f = new Font(Font.SANS_SERIF, Font.PLAIN, 8);
        graphics.setFont(f);
        //draw each String in a separate line
        for (int i = 0; i < bill.length; i++) {
            graphics.drawString(bill[i], 5, y);
            y = y + 15;
        }

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

    public void pp() throws PrinterException {
        PrinterService ps = new PrinterService();
        //get the printer service by printer name
        PrintService pss = ps.getCheckPrintService("Deskjet-1000-J110-series-2");

        PrinterJob job = PrinterJob.getPrinterJob();
        job.setPrintService(pss);
        job.setPrintable(this);

        try {
            job.print();
        } catch (PrinterException ex) {
            ex.printStackTrace();
        }

    }

    public static void main(String[] args) {
        HelloWorldPrinter hwp = new HelloWorldPrinter();
        try {
            hwp.pp();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
4
Harsha

Gehen Sie folgendermaßen vor: -

String newline = System.getProperty("line.separator");

private static final String mText = "SHOP MA" + newline +
        + "----------------------------" + newline +
        + "Pannampitiya" + newline +
        + "09-10-2012 harsha  no: 001" + newline +
        + "No  Item  Qty  Price  Amount" + newline +
        + "1 Bread 1 50.00  50.00" + newline +
        + "____________________________" + newline;
7
Siva Charan
private static final String mText = "SHOP MA" + "\n" +
        + "----------------------------" + "\n" +
        + "Pannampitiya" + newline +
        + "09-10-2012 harsha  no: 001" + "\n" +
        + "No  Item  Qty  Price  Amount" + "\n" +
        + "1 Bread 1 50.00  50.00" + "\n" +
        + "____________________________" + "\n";

Das sollte funktionieren.

2
optional
String newline = System.getProperty("line.separator");
System.out.println("First line" + newline);
System.out.println("Second line" + newline);
System.out.println("Third line");
2
Prajeet Naga

Sie können es mit StringBuilder versuchen: -

    final StringBuilder sb = new StringBuilder();

    sb.append("SHOP MA\n");
    sb.append("----------------------------\n");
    sb.append("Pannampitiya\n");
    sb.append("09-10-2012 harsha  no: 001\n");
    sb.append("No  Item  Qty  Price  Amount\n");
    sb.append("1 Bread 1 50.00  50.00\n");
    sb.append("____________________________\n");

    // To use StringBuilder as String.. Use `toString()` method..
    System.out.println(sb.toString());   
0
Rohit Jain

Ich denke, du machst es zu komplex. AttributedString wird verwendet, wenn Sie Attribute speichern möchten - im Druckkontext. Aber Sie speichern Daten darin. AttributedString

Speichern Sie einfach Ihre Daten im Document-Objekt und übergeben Sie Eigenschaften wie Schriftart, Fett, Kursiv und alles in AttributedString.

Hoffe, das wird hilfreich sein Ein schnelles Tutorial Und Ein tiefes Tutorial

0
Ravi A