我需要打印到标签打印机。我在互联网上找到了下面的代码，并试图根据我的需要对其进行修改。当标签打印机是系统中的默认打印机时，它可以正常工作，但是当我将其他打印机设置为默认打印机时，它不能正确打印。在下面链接的图片中，可以看到默认情况下的结果（右侧），非默认情况下的第一次尝试（中间的）和非默认情况下的第二次尝试。无论打印机是否为默认打印机，我都需要正确打印，因为这将是我们将发布给客户的软件的一部分。我的问题是：当不是默认打印机时，是否应该将任何特定属性或命令发送到打印机以便正确打印？或如何在打印之前从我的代码中将该打印机设置为默认打印机，然后在我完成打印后恢复默认打印机？图片链接（https://lh4.googleusercontent.com/-jBa7bA77ik0/URplehZYVIE/AAAAAAAQWg/bO4EE3wepjg/s279-c/21213）
源代码
/*
* Copyright (c) 2004 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 3nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose,
* including teaching and use in open-source projects.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book,
* please visit http://www.davidflanagan.com/javaexamples3.
*/
//package je3.print;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
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.StreamPrintService;
import javax.print.StreamPrintServiceFactory;
import javax.print.attribute.Attribute;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;
import org.apache.pdfbox.pdmodel.PDDocument;
/**
* This utility program demonstrates the javax.print API and allows you to list
* available printers, query a named printer, print text and image files to a
* printer, and print to postscript files.
*/
public class Print {
public static void main(String[] args) throws IOException {
// These are values we'll set from the command-line arguments
boolean query = false;
String printerName = "Brother QL-570 LE";
String inputFileName = "C:\\dev\\label.pdf";
PrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
attributes.add(OrientationRequested.LANDSCAPE);
if (query) {
// Look for a named printer that can support the
// attributes and print its status
queryPrinter(printerName, attributes);
} else {
// print to the named printer, or to the default
// printer otherwise.
print(printerName, inputFileName, attributes);
}
// The main() method ends here, but there may be a printing thread
// operating in the background. So the program may not terminate
// until printing completes.
}
// List names of all PrintServices that can support the attributes
public static void queryServices(PrintRequestAttributeSet attributes) {
// Find all services that can support the specified attributes
PrintService[] services = PrintServiceLookup.lookupPrintServices(null, attributes);
// Loop through available services
for (int i = 0; i < services.length; i++) {
// Print service name
System.out.print(services[i].getName());
// Then query and print the document types it can print
DocFlavor[] flavors = services[i].getSupportedDocFlavors();
for (int j = 0; j < flavors.length; j++) {
// Filter out DocFlavors that have a representation class other
// than java.io.InputStream.
String repclass = flavors[j].getRepresentationClassName();
if (!repclass.equals("java.io.InputStream"))
continue;
System.out.println("\t" + flavors[j].getMimeType());
}
}
}
// List details about the named printer
public static void queryPrinter(String printerName, PrintRequestAttributeSet attributes) {
// Find the named printer
PrintService service = getNamedPrinter(printerName, attributes);
if (service == null) {
System.out.println(printerName + ": no such printer capable of "
+ "handling the specified attributes");
return;
}
// Print status and other information about the printer
System.out.println(printerName + " status:");
Attribute[] attrs = service.getAttributes().toArray();
for (int i = 0; i < attrs.length; i++)
System.out.println("\t" + attrs[i].getName() + ": " + attrs[i]);
}
// Print the contents of the named file to the named printer (or to a
// default printer if printerName is null) requesting the specified
// attributes.
public static void print(String printerName, String filename, PrintRequestAttributeSet attributes)
throws IOException {
// Look for a printer that can support the attributes
PrintService service = getNamedPrinter(printerName, attributes);
if (service == null) {
System.out.println("Can't find a printer " + "with specified attributes");
return;
}
// Print the file to that printer. See method definition below
printToService(service, filename, attributes);
// Let the user know where to pick up their printout
System.out.println("Printed " + filename + " to " + service.getName());
}
// Print to an output file instead of a printer
public static void printToFile(String outputFileName, String outputFileType,
String inputFileName, PrintRequestAttributeSet attributes) throws IOException {
// Determine whether the system can print to the specified type, and
// get a factory object if so.
// The name of this static method is way too long!
StreamPrintServiceFactory[] factories = StreamPrintServiceFactory
.lookupStreamPrintServiceFactories(null, outputFileType);
// Error message if we can't print to the specified output type
if (factories.length == 0) {
System.out.println("Unable to print files of type: " + outputFileType);
return;
}
// Open the output file
FileOutputStream out = new FileOutputStream(outputFileName);
// Get a PrintService object to print to that file
StreamPrintService service = factories[0].getPrintService(out);
// Print using the method below
printToService(service, inputFileName, attributes);
// And remember to close the output file
out.close();
}
// Print the contents of the named file to the specified PrintService,
// requesting the specified attributes.
// This is shared code used by print() and printToFile() above.
public static void printToService(PrintService service, String filename,
PrintRequestAttributeSet attributes) throws IOException {
// Figure out what type of file we're printing
DocFlavor flavor = getFlavorFromFilename(filename);
// Open the file
//InputStream in = new FileInputStream(filename);
PDDocument document = null;
try
{
document = PDDocument.load(filename);
}
catch (Exception e)
{
System.out.println("Unable to open PDF file ");
}
// Create a Doc object to print from the file and flavor.
Doc doc = new SimpleDoc(document, flavor, null);
// Create a print job from the service
DocPrintJob job = service.createPrintJob();
// Monitor the print job with a listener
job.addPrintJobListener(new PrintJobAdapter() {
public void printJobCompleted(PrintJobEvent e) {
System.out.println("Print job complete");
System.exit(0);
}
public void printDataTransferCompleted(PrintJobEvent e) {
System.out.println("Document transfered to printer");
}
public void printJobRequiresAttention(PrintJobEvent e) {
System.out.println("Print job requires attention");
System.out.println("Check printer: out of paper?");
}
public void printJobFailed(PrintJobEvent e) {
System.out.println("Print job failed");
System.exit(1);
}
});
// Now print the document, catching errors
try {
job.print(doc, attributes);
} catch (PrintException e) {
System.out.println(e);
System.exit(1);
}
}
// A utility method to look up printers that can support the specified
// attributes and return the one that matches the specified name.
public static PrintService getNamedPrinter(String name, PrintRequestAttributeSet attrs) {
PrintService[] services = PrintServiceLookup.lookupPrintServices(null, attrs);
if (services.length > 0) {
if (name == null)
return services[0];
else {
for (int i = 0; i < services.length; i++) {
if (services[i].getName().equals(name))
return services[i];
}
}
}
return null;
}
// 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;
else if (extension.equals("pdf"))
return DocFlavor.SERVICE_FORMATTED.PAGEABLE;
// Fallback: try to determine flavor from file content
else
return DocFlavor.INPUT_STREAM.AUTOSENSE;
}
}