java - 如何知道打印机的打印方法何时完成打印文件？

Question

我正在开发一个打印文件的 JAVA 程序。我需要知道打印机何时完成打印文件，我发现这个简单的代码很有趣:

import javax.print.*;
import javax.print.attribute.DocAttributeSet;
import javax.print.attribute.PrintServiceAttributeSet;
import javax.print.attribute.standard.PrinterStateReason;
import javax.print.attribute.standard.PrinterStateReasons;
import javax.print.attribute.standard.Severity;
import javax.print.event.*;
import java.awt.*;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.*;
import java.util.Set;

/**
 * PrintTest
 */
public class PrintTest implements PrintServiceAttributeListener,PrintJobListener,Doc, Printable, PrintJobAttributeListener {

  private static final transient String TEXT = "12345";

  public static void main(String[] args) {
    PrintTest test = new PrintTest();
    test.checkPrinters();
  }

  public void checkPrinters() {
    Thread newThread = new Thread(new Runnable() {
      public void run() {
    PrintService ps = PrinterJob.getPrinterJob().getPrintService();

    DocFlavor[] myFlavors = ps.getSupportedDocFlavors();
    ps.addPrintServiceAttributeListener(PrintTest.this);
    DocPrintJob docJob = ps.createPrintJob();
      docJob.addPrintJobAttributeListener(PrintTest.this, null);
    docJob.addPrintJobListener(PrintTest.this);
    try {
      docJob.print(PrintTest.this,null);
    }
    catch (PrintException e) {
      e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }
    } });

    newThread.start();
    /**
    PrintServiceAttributeSet attSet = ps.getAttributes();
    PrinterStateReasons psr = ps.getAttribute(PrinterStateReasons.class);

    if (psr != null) {
      Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
      for (PrinterStateReason reason : errors)
        System.out.printf(" Reason : %s",reason.getName());
      System.out.println();
    }          */
  }

  public void attributeUpdate(PrintServiceAttributeEvent psae) {
    System.out.println(psae.getAttributes());
  }

  public void printDataTransferCompleted(PrintJobEvent pje) {
    System.out.println("Transfer completed");
  }

  public void printJobCompleted(PrintJobEvent pje) {
    System.out.println("Completed");
  }

  public void printJobFailed(PrintJobEvent pje) {
    System.out.println("Failed");
    PrinterStateReasons psr = pje.getPrintJob().getPrintService().getAttribute(PrinterStateReasons.class);
    if (psr != null) {
      Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
      for (PrinterStateReason reason : errors)
        System.out.printf(" Reason : %s",reason.getName());
      System.out.println();
    }
  }

  public void printJobCanceled(PrintJobEvent pje) {
    System.out.println("Canceled");
  }

  public void printJobNoMoreEvents(PrintJobEvent pje) {
    System.out.println("No more events");
  }

  public void printJobRequiresAttention(PrintJobEvent pje) {
    System.out.println("Job requires attention");
    PrinterStateReasons psr = pje.getPrintJob().getPrintService().getAttribute(PrinterStateReasons.class);
    if (psr != null) {
      Set<PrinterStateReason> errors = psr.printerStateReasonSet(Severity.REPORT);
      for (PrinterStateReason reason : errors)
        System.out.printf(" Reason : %s",reason.getName());
      System.out.println();
    }
  }

  public DocFlavor getDocFlavor() {
    return DocFlavor.SERVICE_FORMATTED.PRINTABLE;  //To change body of implemented methods use File | Settings | File Templates.
  }

  public Object getPrintData() throws IOException {
    return this;
  }

  public DocAttributeSet getAttributes() {
    return null;  //To change body of implemented methods use File | Settings | File Templates.
  }

  public Reader getReaderForText() throws IOException {
    return null; //To change body of implemented methods use File | Settings | File Templates.
  }

  public InputStream getStreamForBytes() throws IOException {
    return null;  //To change body of implemented methods use File | Settings | File Templates.
  }

  public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
    return pageIndex == 0 ? PAGE_EXISTS : NO_SUCH_PAGE;  //To change body of implemented methods use File | Settings | File Templates.
  }

  public void attributeUpdate(PrintJobAttributeEvent pjae) {
    System.out.println("Look out");
  }
}

所以，我感兴趣的方法是:

public void printJobCompleted(PrintJobEvent pje) {
    System.out.println("Completed");
  }

但这对我不起作用。问题是打印机不支持这种类型的代码。谁能告诉我支持此代码的打印机型号？

Answer 1

看示例代码here :

看起来您需要实现您的 PrintJobAdapter。相关位是:

package com.your.package;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.InputStream;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;

public class DetermineThatPrintJobHasFinished {

    public static void main(String[] args) throws Exception {
       //...    see example in link

      // Locate the default print service for this environment.    
      PrintService service = PrintServiceLookup.lookupDefaultPrintService();

      // Create and return a PrintJob capable of handling data from    
      // any of the supported document flavors.    
      DocPrintJob printJob = service.createPrintJob();

      // register a listener to get notified when the job is complete    
      JobCompleteMonitor monitor = new JobCompleteMonitor();    
      printJob.addPrintJobListener(monitor);

      // Construct a SimpleDoc with the specified print data, doc flavor and doc attribute set.    
      Doc doc = new SimpleDoc(is, flavor, null);

      // Print a document with the specified job attributes.    
      printJob.print(doc, null);    
      monitor.waitForJobCompletion();

      is.close();
    }

    private static class JobCompleteMonitor extends PrintJobAdapter {   
        private boolean completed = false;

        @Override
        public void printJobCanceled(PrintJobEvent pje) {
            signalCompletion();
        }

        @Override
        public void printJobCompleted(PrintJobEvent pje) {
            signalCompletion();
        }

        @Override
        public void printJobFailed(PrintJobEvent pje) {
            signalCompletion();
        }

        @Override
        public void printJobNoMoreEvents(PrintJobEvent pje) {
            signalCompletion();
        }

        private void signalCompletion() {
           synchronized (JobCompleteMonitor.this) { 
               completed = true;    
               JobCompleteMonitor.this.notify();    
           }
        }

        public synchronized void waitForJobCompletion() {    
            try {
                while (!completed) {
                    wait();
                }
            } catch (InterruptedException e) {
            }
        }
    }
}