我在通过 java 发送要打印到我的打印机的文档时遇到很多问题，我没有收到任何错误消息或任何东西，我可以在队列中看到打印作业，但它没有打印出任何东西，我已经重新安装了打印机驱动程序等但没有运气，到目前为止我唯一的运气是一个代码可以完美运行并发送并成功打印出文档。
下面是有效的java代码：
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;
import java.text.*;
/**
* The PrintText application expands on the
* PrintExample application in that it images
* text on to the single page printed.
*/
public class PrintText implements Printable {
/**
* The text to be printed.
*/
private static final String mText =
"Four score and seven years ago our fathers brought forth on this "
+ "continent a new nation, conceived in liberty and dedicated to the "
+ "proposition that all men are created equal. Now we are engaged in "
+ "a great civil war, testing whether that nation or any nation so "
+ "conceived and so dedicated can long endure. We are met on a great "
+ "battlefield of that war. We have come to dedicate a portion of "
+ "that field as a final resting-place for those who here gave their "
+ "lives that that nation might live. It is altogether fitting and "
+ "proper that we should do this. But in a larger sense, we cannot "
+ "dedicate, we cannot consecrate, we cannot hallow this ground."
+ "The brave men, living and dead who struggled here have consecrated "
+ "it far above our poor power to add or detract. The world will "
+ "little note nor long remember what we say here, but it can never "
+ "forget what they did here. It is for us the living rather to be "
+ "dedicated here to the unfinished work which they who fought here "
+ "have thus far so nobly advanced. It is rather for us to be here "
+ "dedicated to the great task remaining before us--that from these "
+ "honored dead we take increased devotion to that cause for which "
+ "they gave the last full measure of devotion--that we here highly "
+ "resolve that these dead shall not have died in vain, that this "
+ "nation under God shall have a new birth of freedom, and that "
+ "government of the people, by the people, for the people shall "
+ "not perish from the earth.";
/**
* Our text in a form for which we can obtain a
* AttributedCharacterIterator.
*/
private static final AttributedString mStyledText = new AttributedString(mText);
/**
* Print a single page containing some sample text.
*/
static public void main(String args[]) {
/* Get the representation of the current printer and
* the current print job.
*/
PrinterJob printerJob = PrinterJob.getPrinterJob();
/* Build a book containing pairs of page painters (Printables)
* and PageFormats. This example has a single page containing
* text.
*/
Book book = new Book();
book.append(new PrintText(), new PageFormat());
/* Set the object to be printed (the Book) into the PrinterJob.
* Doing this before bringing up the print dialog allows the
* print dialog to correctly display the page range to be printed
* and to dissallow any print settings not appropriate for the
* pages to be printed.
*/
printerJob.setPageable(book);
/* Show the print dialog to the user. This is an optional step
* and need not be done if the application wants to perform
* 'quiet' printing. If the user cancels the print dialog then false
* is returned. If true is returned we go ahead and print.
*/
boolean doPrint = printerJob.printDialog();
if (doPrint) {
try {
printerJob.print();
} catch (PrinterException exception) {
System.err.println("Printing error: " + exception);
}
}
}
/**
* Print a page of text.
*/
public int print(Graphics g, PageFormat format, int pageIndex) {
/* We'll assume that Jav2D is available.
*/
Graphics2D g2d = (Graphics2D) g;
/* Move the origin from the corner of the Paper to the corner
* of the imageable area.
*/
g2d.translate(format.getImageableX(), format.getImageableY());
/* Set the text color.
*/
g2d.setPaint(Color.black);
/* Use a LineBreakMeasurer instance to break our text into
* lines that fit the imageable area of the page.
*/
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;
}
}
但
这不是我想要做的，理想情况下我需要能够发送像 txt 文件这样的文档来打印，而不仅仅是我添加的一些文本，所以下面的代码不起作用，没有错误消息，甚至说打印完成。 .... 在终端中，可以在队列中再次看到这项工作，但从未打印出任何内容，我做错了什么？
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.File;
import java.io.FileInputStream;
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;
public class PrintTextFile {
public static void main(String[] args) throws PrintException, IOException {
String defaultPrinter =
PrintServiceLookup.lookupDefaultPrintService().getName();
System.out.println("Default printer: " + defaultPrinter);
PrintService service = PrintServiceLookup.lookupDefaultPrintService();
FileInputStream in = new FileInputStream(new File("D:/Documents/testDocToPrintUsingJava.txt"));
PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
pras.add(new Copies(1));
DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
Doc doc = new SimpleDoc(in, flavor, null);
DocPrintJob job = service.createPrintJob();
PrintJobWatcher pjw = new PrintJobWatcher(job);
job.print(doc, pras);
pjw.waitForDone();
in.close();
// send FF to eject the page
InputStream ff = new ByteArrayInputStream("\f".getBytes());
Doc docff = new SimpleDoc(ff, flavor, null);
DocPrintJob jobff = service.createPrintJob();
pjw = new PrintJobWatcher(jobff);
jobff.print(docff, null);
pjw.waitForDone();
}
}
class PrintJobWatcher {
boolean done = false;
PrintJobWatcher(DocPrintJob job) {
job.addPrintJobListener(new PrintJobAdapter() {
public void printJobCanceled(PrintJobEvent pje) {
allDone();
}
public void printJobCompleted(PrintJobEvent pje) {
allDone();
}
public void printJobFailed(PrintJobEvent pje) {
allDone();
}
public void printJobNoMoreEvents(PrintJobEvent pje) {
allDone();
}
void allDone() {
synchronized (PrintJobWatcher.this) {
done = true;
System.out.println("Printing done ...");
PrintJobWatcher.this.notify();
}
}
});
}
public synchronized void waitForDone() {
try {
while (!done) {
wait();
}
} catch (InterruptedException e) {
}
}
}