大家好我有下面的代码，它符合正常，没有错误但它没有做任何事情，它的意思是打印出一个页面说
你好世界 祝你有愉快的一天但没有任何反应，我做错了什么？
代码：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Richard
*/
import java.io.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;
import javax.print.event.*;
public class printtest {
public static void main(String[] args) {
try {
// Open the image file
String testData = "hello world \r\n have a nice day.";
InputStream is = new ByteArrayInputStream(testData.getBytes());
DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE ;
//DocFlavor flavor = DocFlavor.STRING.TEXT_PLAIN;
//DocFlavor flavor = DocFlavor.CHAR_ARRAY.TEXT_PLAIN;
// Find the default service
PrintService service = PrintServiceLookup.lookupDefaultPrintService();
System.out.println(service);
// Create the print job
DocPrintJob job = service.createPrintJob();
Doc doc= new SimpleDoc(is, flavor, null);
PrintJobWatcher pjDone = new PrintJobWatcher(job);
// Print it
job.print(doc, null);
pjDone.waitForDone();
// It is now safe to close the input stream
is.close();
} catch (PrintException e) {
System.out.println("print exception");
System.out.println(e.getMessage());
} catch (IOException e) {
System.out.println("IO exception");
e.printStackTrace();
}
}
static class PrintJobWatcher {
// true iff it is safe to close the print job's input stream
boolean done = false;
PrintJobWatcher(DocPrintJob job) {
// Add a listener to the print 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;
PrintJobWatcher.this.notify();
}
}
});
}
public synchronized void waitForDone() {
try {
while (!done) {
wait();
}
} catch (InterruptedException e) {
}
}
}
}
它出现了一个显示的窗口：
Win32打印机：HP988FD1（HP Officejet Pro 8600）
然后什么都不做，作业在队列中出现了一瞬间，但没有任何反应，重新安装了打印机的驱动程序等仍然没有运气，工作正常，下面的代码我已经运行了成功打印了一页：
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;
}
}
答案 0 :(得分：0)
PrintService API有可能在最终确定打印作业之前等待InputStream关闭。
删除pjDone.waitForDone()并查看会发生什么（这对我来说很合适）
答案 1 :(得分：0)
我遇到了类似的问题，但要打印PDF，而不是基本文本。它在Linux（Fedora）上工作得很好，但在Windows上却没有。所以，如果它可以帮助任何人，这是我的解决方案：
我注意到打印机可能无法处理PDF。我最终决定使用第三方库Apache PdfBox，它运行得很好。
我在答案中为类似问题https://stackoverflow.com/a/39271053/935039编写了一些示例代码，如果有帮助的话。