使用Java打印到网络打印机

问题描述：

我需要发送pdf文档以在Web应用程序的服务器端进行打印，打印机完全支持pdf打印等，并且它也已联网到服务器. pdf也存储在服务器上.

i require to send a pdf document to print on the server side of a web app, the printer fully supports pdf printing etc, it is networked as well to the server. The pdf is also stored on the server.

我要在按钮上单击的内容，打印出pdf文件，目前我的代码如下:

what i am trying to is on a button click, print out the pdf file, currently i have the code below :

//Server side printing
public class PrintDocument {

    public void printText(String text) throws PrintException, IOException {

        //Looks for all printers
        //PrintService[] printServices = PrinterJob.lookupPrintServices();

        PrintService service = PrintServiceLookup.lookupDefaultPrintService();
        InputStream is = new ByteArrayInputStream(text.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 has successfully completed, please collect your prints)");
                    PrintJobWatcher.this.notify();
                }
            }
        });
    }

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

但是我有几个问题/问题，如何将pdf放入要打印的输入流中，我是否可以选择诸如双面打印之类的选项，以及如何从JSF Web应用程序内部调用它

But i have a few questions / issues, how do i put the pdf into the input stream for this to be printed out, can i select options such as duplex printing, and how can i call this from inside a JSF web app

谢谢

答

在阅读了此问答之后，我花了一段时间使用javax.print库，只是发现它与打印机选件支持不是很一致. IE.即使打印机具有诸如装订的选项，javax.printer库也将其显示为不支持装订".

After reading through this Q&A I spent awhile working with the javax.print library only to discover that it is not very consistent with printer option support. I.e. even if a printer has an option like stapling, the javax.printer library showed it as "stapling not supported".

因此，我然后使用普通的Java套接字尝试了PJL命令，并且效果很好，在我的测试中，它的打印速度也比javax.print库快，它的代码占用空间小得多，而且最好的部分是不需要使用任何库全部:

So I then tried out PJL commands using a plain java socket and it worked great, in my tests it also printed faster than the javax.print library, it has a much smaller code footprint and best part is no libraries are needed at all:

private static void print(File document, String printerIpAddress)
{
    try (Socket socket = new Socket(printerIpAddress, 9100))
    {
        DataOutputStream out = new DataOutputStream(socket.getOutputStream());
        String title = document.getName();
        byte[] bytes = Files.readAllBytes(document.toPath());

        out.write(27);
        out.write("%-12345X@PJL\n".getBytes());
        out.write(("@PJL SET JOBNAME=" + title + "\n").getBytes());
        out.write("@PJL SET DUPLEX=ON\n".getBytes());
        out.write("@PJL SET STAPLEOPTION=ONE\n".getBytes());
        out.write("@PJL ENTER LANGUAGE=PDF\n".getBytes());
        out.write(bytes);
        out.write(27);
        out.write("%-12345X".getBytes());
        out.flush();
        out.close();
    }
    catch (Exception e)
    {
        System.out.println(e);
    }
}

有关尝试使用javax.print 的更多信息，请参见此.

See this for more info on attempts with javax.print.

使用Java打印到网络打印机

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