我需要使用

java打印一个字符串,所以我喜欢以下解决方案经过google搜索了很多.我做了一些更改来打印字符串而不显示打印对话框.我的问题是虽然这个方法正确地打印了字符串,但它不会像我定义的那样破坏行.请告诉我如何打印带换行符的字符串.

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;

}

}

打印机服务提供课程

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;

}

}