java - 有没有办法让这个 "send to printer"Java 方法起作用？

Question

public static void sendPdfToPrinter(String epsilon)
{
    FileInputStream psStream = null;
    try {
        psStream = new FileInputStream(epsilon);
        } catch (FileNotFoundException ffne) {
          ffne.printStackTrace();
        }
        if (psStream == null) {
            return;
        }
    DocFlavor psInFormat = DocFlavor.INPUT_STREAM.AUTOSENSE;
    Doc myDoc = new SimpleDoc(psStream, psInFormat, null);  
    PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
    PrintService[] services = PrintServiceLookup.lookupPrintServices(psInFormat, aset);

    // this step is necessary because I have several printers configured
    PrintService myPrinter = null;
    for (int i = 0; i < services.length; i++)
    {
        String svcName = services[i].toString();          
        System.out.println("service found: "+ svcName); 
        if (svcName.contains("series"))
        {
            myPrinter = services[i];
            System.out.println("my printer found: "+svcName);
            break;
        }
    }

    if (myPrinter != null) {            
        DocPrintJob job = myPrinter.createPrintJob();
        try {
        job.print(myDoc, aset);

        } catch (Exception pe) {pe.printStackTrace();}
    } else {
        System.out.println("no printer services found");
    }
}

public static void main(String[] args) throws IOException
{
    //@SuppressWarnings("unused")
    //Testing t = new Testing();
    String DEST = ("C:/Users/Brian/Desktop/SO046201R-17/TestingAlpha/6FS-2m.pdf");
    sendPdfToPrinter(DEST);
}

我目前正在编写一个程序，它将文本写入一系列 PDF 文件，然后将它们发送到打印机。我已经完成了对 PDF 部分的写入，但是每当我尝试将文件传递给“sendPdfToPrinter”方法时，我都会遇到问题。到目前为止，我已经测试了一台 HP Deskjet 打印机和一台 Canon Inkjet 打印机，但没有成功(前者给出了“Java 文档错误”消息，后者不会将文件添加到队列中)。我想我的问题归结为:

是代码问题还是我使用的打印机问题？有解决方法吗？

使用 Mark 的编辑:

public static void sendPdfToPrinter(String epsilon) throws 
InvalidPasswordException, IOException
{
    FileInputStream psStream = null;
    try {
        psStream = new FileInputStream(epsilon);
        } catch (FileNotFoundException ffne) {
          ffne.printStackTrace();
        }
        if (psStream == null) {
            return;
        }
    DocFlavor psInFormat = DocFlavor.INPUT_STREAM.AUTOSENSE;
    PDDocument myDoc = PDDocument.load(new File(epsilon));  
    PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
    PrintService[] services = 
    PrintServiceLookup.lookupPrintServices(psInFormat, aset);

    // this step is necessary because I have several printers configured
    PrintService myPrinter = null;
    for (int i = 0; i < services.length; i++)
    {
        String svcName = services[i].toString();          
        System.out.println("service found: "+ svcName); 
        if (svcName.contains("series"))
        {
            myPrinter = services[i];
            System.out.println("my printer found: "+svcName);
            break;
        }
    }

    if (myPrinter != null) {            
        PrinterJob job = PrinterJob.getPrinterJob();

        try {
            job.setPrintService(myPrinter);
            job.setPageable(new PDFPageable(myDoc));
            job.print();
        } catch (PrinterException e) {
            // Handle the exception.
        }
    } else {
        System.out.println("no printer services found");
    }

}

Answer 1

这可能是因为您的打印机本身不支持 PDF。实际上，我设法用您的代码打印了一个 PDF，但它打印出来的效果就像将 PDF 文件作为文本文件打开一样。

一种解决方案是使用 Apache 的 Java PDF 库:PDFBox .该文件可以像这样加载:

PDDocument myDoc = PDDocument.load(new File(epsilon));

要打印文件，请使用 PrinterJob 而不是 DocPrintJob:

PrinterJob job = PrinterJob.getPrinterJob();

try {
    job.setPrintService(myPrinter);
    job.setPageable(new PDFPageable(myDoc));
    job.print();
} catch (PrinterException e) {
    // Handle the exception.
}