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Listening for Print Job Attribute Changes

import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.OutputStream; import javax.print.DocFlavor; import javax.print.DocPrintJob; import javax.print.StreamPrintService; import javax.print.StreamPrintServiceFactory; import javax.print.attribute.Attribute; import javax.print.attribute.HashPrintJobAttributeSet; import javax.print.attribute.PrintJobAttributeSet; import javax.print.attribute.standard.JobMediaSheetsCompleted; import javax.print.event.PrintJobAttributeEvent; import javax.print.event.PrintJobAttributeListener; public class Main {   public static void main(String[] argv) throws Exception {     OutputStream fos = new BufferedOutputStream(new FileOutputStream("filename.ps"));     DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;     StreamPrintServiceFactory[] factories = StreamPrintServiceFactory         .lookupStreamPrintServiceFactories(flavor, DocFlavor.BYTE_ARRAY.POSTSCRIPT.getMimeType());     StreamPrintService service = factories[0].getPrintService(fos);     DocPrintJob job = service.createPrintJob();     PrintJobAttributeSet set = new HashPrintJobAttributeSet(job.getAttributes());     set.add(new JobMediaSheetsCompleted(0));     job.addPrintJobAttributeListener(new MyPrintJobAttributeListener(), set);   } } class MyPrintJobAttributeListener implements PrintJobAttributeListener {   public void attributeUpdate(PrintJobAttributeEvent pjae) {     Attribute[] attrs = pjae.getAttributes().toArray();     for (int i = 0; i < attrs.length; i++) {       String attrName = attrs[i].getName();       String attrValue = attrs[i].toString();     }   } }