java - 打印机在服务器而不是客户端打印

Question

我有一个java程序，可以将原始数据打印到热敏打印机。该代码在服务器中运行完美，但是当在客户端中访问时，它会在服务器的打印机本身而不是客户端的默认打印机上打印。下面是我用来打印的代码。请帮助我编写该代码。

import java.io.ByteArrayInputStream;
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.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;

import javax.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;

public class PrintText {

    public static void main(String[] args) throws PrintException, IOException {

        String defaultPrinter = PrintServiceLookup.lookupDefaultPrintService().getName();
        System.out.println("Default printer: " + defaultPrinter);
        PrintService service = PrintServiceLookup.lookupDefaultPrintService();

        // prints the famous hello world! plus a form feed
        InputStream is = new ByteArrayInputStream("\nMadha Enterprice\n".getBytes(UTF8));

        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        pras.add(new Copies(1));

        DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
        Doc doc = new SimpleDoc(is, flavor, null);
        DocPrintJob job = service.createPrintJob();

        PrintJobWatcher pjw = new PrintJobWatcher(job);
        job.print(doc, pras);
        pjw.waitForDone();
        is.close();
    }
}

class PrintJobWatcher {
    boolean done = false;

    PrintJobWatcher(DocPrintJob 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;
                    System.out.println("Printing done ...");
                    PrintJobWatcher.this.notify();
                }
            }
        });
    }

    public synchronized void waitForDone() {
        try {
            while (!done) {
                wait();
            }
        } catch (InterruptedException e) {
        }
    }
}

Answer 1

使用以下代码:

PrintService service = PrintServiceLookup.lookupDefaultPrintService();

您选择此代码运行的计算机上的默认打印机 - 如果它在服务器上运行，则预计它会在服务器默认打印机上打印。