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我必須使用javax.print api打印文件（純文本）。我能夠查找打印機並提交打印作業。但是我只能打印一份文件。以下是我一直在使用的代碼。javax.print.attribute.PrintRequestAttributeSet打印機忽略的選項
打印機無法識別使用PrintRequestAttributeSet指定的選項/屬性。雖然我指定要打印兩份，但打印機只打印一份。我在這裏做錯了什麼？使用
打印機：佳能iR5050 PCL6
包com.print;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
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.attribute.standard.Finishings;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.NumberUp;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.attribute.standard.Sides;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;
public class TestPrint {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String fileName = "D:/test.log";
// Open the file
InputStream in = null;
try {
in = new FileInputStream(fileName);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Figure out what type of file we're printing
DocFlavor myFormat = getFlavorFromFilename(fileName);
// Create a Doc
Doc myDoc = new SimpleDoc(in, myFormat, null);
// Build a set of attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(OrientationRequested.LANDSCAPE);
aset.add(new Copies(2));
aset.add(Sides.DUPLEX);
aset.add(MediaSizeName.NA_LETTER);
aset.add(new NumberUp(2));
aset.add(Finishings.STAPLE);
// discover the printers that can print the format according to the
// instructions in the attribute set
PrintService[] services = PrintServiceLookup.lookupPrintServices(
myFormat, aset);
// Create a print job from one of the print services
if (services.length > 0) {
System.out.println("The print sent to>>>" + services[0].getName());
DocPrintJob job = services[0].createPrintJob();
// Monitor the print job with a listener
job.addPrintJobListener(new PrintJobAdapter() {
public void printDataTransferCompleted(PrintJobEvent e) {
System.out.println("Data transfer completed!");
}
public void printJobNoMoreEvents(PrintJobEvent e) {
System.out.println("No more events!");
}
public void printJobRequiresAttention(PrintJobEvent e) {
System.out.println("Requires Attention!");
}
public void printJobFailed(PrintJobEvent e) {
System.out.println("Print Job Failed!");
}
public void printJobCompleted(PrintJobEvent e) {
System.out.println("Print Job Completed!");
}
public void printJobCanceled(PrintJobEvent e) {
System.out.println("Print Job Cancelled!");
}
});
try {
job.print(myDoc, aset);
} catch (PrintException pe) {
pe.printStackTrace();
}
System.out.println("The print job ........");
}
}
// A utility method to return a DocFlavor object matching the
// extension of the filename.
public static DocFlavor getFlavorFromFilename(String filename) {
String extension = filename.substring(filename.lastIndexOf('.') + 1);
extension = extension.toLowerCase();
if (extension.equals("gif"))
return DocFlavor.INPUT_STREAM.GIF;
else if (extension.equals("jpeg"))
return DocFlavor.INPUT_STREAM.JPEG;
else if (extension.equals("jpg"))
return DocFlavor.INPUT_STREAM.JPEG;
else if (extension.equals("png"))
return DocFlavor.INPUT_STREAM.PNG;
else if (extension.equals("ps"))
return DocFlavor.INPUT_STREAM.POSTSCRIPT;
else if (extension.equals("txt"))
return DocFlavor.INPUT_STREAM.TEXT_PLAIN_HOST;
// Fallback: try to determine flavor from file content
else
return DocFlavor.INPUT_STREAM.AUTOSENSE;
}
}