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;
}
}
打印机服务提供类
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;
}
}
答案 0 :(得分：7)
这样做： -
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;
答案 1 :(得分：4)
好的，最后我为我的账单打印任务找到了一个很好的解决方案，它对我来说是正常的。
此类提供打印服务
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;
}
}
此课程演示了帐单打印任务，
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();
}
}
}
答案 2 :(得分：2)
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";
这应该有用。
答案 3 :(得分：2)
String newline = System.getProperty("line.separator");
System.out.println("First line" + newline);
System.out.println("Second line" + newline);
System.out.println("Third line");
答案 4 :(得分：0)
您可以尝试使用StringBuilder： -
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());
答案 5 :(得分：0)
我认为你太复杂了。当您想要存储属性时使用AttributedString - 在Printing Context中。但是你在里面存储数据。 AttributedString
简单地说，将您的数据存储到Document对象中，并在AttributedString中传递Font，Bold，Italic等所有属性。
希望这会有所帮助 A quick tutorial而且 In depth tutorial
答案 6 :(得分：0)
在字符串之间添加/ r / n对我来说解决了这个问题。试试看。 在粘贴时，请勿在排除项中添加'//'。
例如：Option01 \ r \ nOption02 \ r \ nOption03
这将输出为
Option01
Option02
Option03
答案 7 :(得分：-1)
使用字符串缓冲区。
final StringBuffer mText = new StringBuffer("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");
答案 8 :(得分：-1)
package test2;
public class main {
public static void main(String[] args) {
vehical vehical1 = new vehical("civic", "black","2012");
System.out.println(vehical1.name+"\n"+vehical1.colour+"\n"+vehical1.model);
}
}