Printer

//获取本地的打印服务，并且设置默认打印机
private JComboBox<String> selectPrintService() {
    defaultPrintService = PrintServiceLookup.lookupDefaultPrintService();//获取默认打印机
    JComboBox<String> comboBox = new JComboBox<>();
    //获得本台电脑连接的所有打印机
    PrintService[] printServices = PrinterJob.lookupPrintServices();
    if (printServices == null || printServices.length == 0) {
        comboBox.addItem("获取本地打印机失败，请联系管理员！");
    } else {
        for (PrintService printService : printServices) {
            String value = printService.getName();
            serviceMap.put(value, printService);//将打印机名称及打印机服务添加到集合
            comboBox.addItem(value);
            //将默认打印机设置为下拉选的默认选择项
            if (defaultPrintService != null && defaultPrintService.getName().equals(value)) {
                comboBox.setSelectedItem(value);
            }
        }
    }
    return comboBox;
}

public void print(Container parent) {
    PDDocument document = null;
    File file;
    try {
        file = new File(filepath);
        if (file == null || !file.exists()) {
            JOptionPane.showMessageDialog(parent, "要打印的PDF文件不存在！", "警告", JOptionPane.WARNING_MESSAGE);
            return;
        }
        document = PDDocument.load(file);
        PrinterJob printerJob = PrinterJob.getPrinterJob();
        printerJob.setJobName(file.getName());
        printerJob.setPrintService(defaultPrintService);//设置打印机
        //设置纸张及缩放
        PDFPrintable pdfPrintable = new PDFPrintable(document, scaling);
        //设置多页打印
        Book book = new Book();
        PageFormat pageFormat = new PageFormat();
        //设置打印方向
        pageFormat.setOrientation(orientation);//纵向
        Paper paper = getPaper();
        pageFormat.setPaper(paper);
        book.append(pdfPrintable, pageFormat, document.getNumberOfPages());
        printerJob.setPageable(book);
        printerJob.setCopies(copies);//设置打印份数
        //添加打印属性
        HashPrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
        attributes.add(sides); //设置单双页
        attributes.add(MediaSizeName.ISO_A4);//默认A4纸打印
        printerJob.print(attributes);
    
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (document != null) {
            try {
                document.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

private Paper getPaper() {
    Paper paper = new Paper();
    // 默认为A4纸张，对应像素宽和高分别为 595, 842
    int width = 595;
    int height = 842;
    // 设置边距，单位是像素，10mm边距，对应 28px
    int marginLeft = 12;
    int marginRight = 12;
    int marginTop = 12;
    int marginBottom = 12;
    paper.setSize(width, height);
    // 下面一行代码，解决了打印内容为空的问题
    paper.setImageableArea(marginLeft, marginRight, width - (marginLeft + marginRight), height - (marginTop + marginBottom));
    return paper;
}