java - 使用 javax.print 将纯文本文件打印到 PDF 打印机会导致一个空文件

Question

我需要从纯文本文件创建一个 pdf 文件。我认为最简单的方法是读取这些文件并将它们打印到 PDF 打印机。我的问题是，如果我打印到 pdf 打印机，结果将是一个空的 pdf 文件。如果我打印到 Microsoft XPS Document Writer，该文件将以纯文本格式创建，而不是 oxps 格式。我会对两步或三步的解决方案感到满意。（例如，先转换为 xps，然后使用 ghostscript 或类似的东西转换为 pdf）。我尝试了几款 pdf 打印机，例如：CutePDF、Microsoft PDF writer、Bullzip PDF。每个人的结果都是一样的。

环境为Java 1.7/1.8 Win10

private void print() {

    try {
        DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE;

        PrintRequestAttributeSet patts = new HashPrintRequestAttributeSet();                   
        PrintService[] ps = PrintServiceLookup.lookupPrintServices(flavor, patts);
        if (ps.length == 0) {
            throw new IllegalStateException("No Printer found");
        }
        System.out.println("Available printers: " + Arrays.asList(ps));
        PrintService myService = null;
        for (PrintService printService : ps) {
            if (printService.getName().equals("Microsoft XPS Document Writer")) { // 
                myService = printService;
                break;
            }
        }
        if (myService == null) {
            throw new IllegalStateException("Printer not found");
        }

        myService.getSupportedDocFlavors();
        DocPrintJob job = myService.createPrintJob();


   FileInputStream fis1 = new FileInputStream("o:\\k\\t1.txt");

        Doc pdfDoc = new SimpleDoc(fis1, DocFlavor.INPUT_STREAM.AUTOSENSE, null);

        HashPrintRequestAttributeSet pr = new HashPrintRequestAttributeSet();
        pr.add(OrientationRequested.PORTRAIT);
        pr.add(new Copies(1));
        pr.add(MediaSizeName.ISO_A4);
        PrintJobWatcher pjw = new PrintJobWatcher(job);
        job.print(pdfDoc, pr);
        pjw.waitForDone();
        fis1.close();

    } catch (PrintException ex) {
        Logger.getLogger(Docparser.class.getName()).log(Level.SEVERE, null, ex);
    } catch (Exception ex) {
        Logger.getLogger(Docparser.class.getName()).log(Level.SEVERE, null, ex);
    }
}


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) {
        }
    }
}

标签： javapdfprinting

Answer 1

如果您可以安装 LibreOffice，则可以使用 Java UNO API 来执行此操作。

这里有一个类似的示例，它将加载和保存文件：Java Convert Word to PDF with UNO。这可用于将您的文本文件转换为 PDF。

或者，您可以获取文本文件并使用相同的 API 将其直接发送到打印机。

以下 JAR 提供对 UNO API 的访问权限。确保这些在您的类路径中：

[Libre Office Dir]/URE/java/juh.jar
[Libre Office Dir]/URE/java/jurt.jar
[Libre Office Dir]/URE/java/ridl.jar
[Libre Office Dir]/program/classes/unoil.jar
[Libre Office Dir]/program

然后，以下代码将带您sourceFile打印到printer名为“本地打印机 1”。

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import com.sun.star.beans.PropertyValue;
import com.sun.star.frame.XComponentLoader;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.view.XPrintable;

public class DirectPrintTest
{
    public static void main(String args[])
    {
        // set to the correct name of your printers
        String printer = "Local Printer 1";// "Microsoft Print to PDF";
        File sourceFile = new File("c:/projects/WelcomeTemplate.doc");

        if (!sourceFile.canRead()) {
            throw new RuntimeException("Can't read:" + sourceFile.getPath());
        }

        com.sun.star.uno.XComponentContext xContext = null;

        try {
            // get the remote office component context
            xContext = com.sun.star.comp.helper.Bootstrap.bootstrap();
            System.out.println("Connected to a running office ...");

            // get the remote office service manager
            com.sun.star.lang.XMultiComponentFactory xMCF = xContext
                    .getServiceManager();

            Object oDesktop = xMCF.createInstanceWithContext(
                    "com.sun.star.frame.Desktop", xContext);

            com.sun.star.frame.XComponentLoader xCompLoader = (XComponentLoader) UnoRuntime
                    .queryInterface(com.sun.star.frame.XComponentLoader.class,
                            oDesktop);

            StringBuffer sUrl = new StringBuffer("file:///");
            sUrl.append(sourceFile.getCanonicalPath().replace('\\', '/'));

            List<PropertyValue> loadPropsList = new ArrayList<PropertyValue>();
            PropertyValue pv = new PropertyValue();
            pv.Name = "Hidden";
            pv.Value = Boolean.TRUE;
            loadPropsList.add(pv);

            PropertyValue[] loadProps = new PropertyValue[loadPropsList.size()];
            loadPropsList.toArray(loadProps);

            // Load a Writer document, which will be automatically displayed
            com.sun.star.lang.XComponent xComp = xCompLoader
                    .loadComponentFromURL(sUrl.toString(), "_blank", 0,
                            loadProps);

            // Querying for the interface XPrintable on the loaded document
            com.sun.star.view.XPrintable xPrintable = (XPrintable) UnoRuntime
                    .queryInterface(com.sun.star.view.XPrintable.class, xComp);

            // Setting the property "Name" for the favoured printer (name of
            // IP address)
            com.sun.star.beans.PropertyValue propertyValue[] = new com.sun.star.beans.PropertyValue[2];
            propertyValue[0] = new com.sun.star.beans.PropertyValue();
            propertyValue[0].Name = "Name";
            propertyValue[0].Value = printer;

            // Setting the name of the printer
            xPrintable.setPrinter(propertyValue);

            propertyValue[0] = new com.sun.star.beans.PropertyValue();
            propertyValue[0].Name = "Wait";
            propertyValue[0].Value = Boolean.TRUE;

            // Printing the loaded document
            System.out.println("sending print");
            xPrintable.print(propertyValue);

            System.out.println("closing doc");
            ((com.sun.star.util.XCloseable) UnoRuntime.queryInterface(
                    com.sun.star.util.XCloseable.class, xPrintable))
                    .close(true);

            System.out.println("closed");

            System.exit(0);
        } catch (Exception e) {
            e.printStackTrace(System.err);
            System.exit(1);
        }
    }

}