java - 在java中使用itext对齐PDF中的内容

Question

我现在被这个问题困扰了一段时间。我正在文档中绘制一个饼图并显示 jtable 数据。我无法对齐 pdf 文件 中的内容。如何将jtable 数据以及饼图与此pdf对齐。我在下面提到了我的代码和图像。 如您所见，我需要将 jtable 数据 稍微对齐到顶部，并且它还必须适合 page 的 width .

     private void graphical_to_pdf() {

    graph_table.setSize(graph_table.getPreferredSize());

    JTableHeader th = graph_table.getTableHeader();
    th.setSize(th.getPreferredSize());

    PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 800, 800, 0.65f);
    com.itextpdf.text.Font f = new com.itextpdf.text.Font(com.itextpdf.text.Font.FontFamily.TIMES_ROMAN, 18.0f, com.itextpdf.text.Font.NORMAL, BaseColor.BLACK);

    Document doc = new Document(new com.itextpdf.text.Rectangle(900, 900));

    //Creating a paper to store the jtable contents
    Paper paper = new Paper();

    paper.setSize(800, 800);
    paper.setImageableArea(0, 100, 800, 800);

    PageFormat pf = new PageFormat();
    pf.setPaper(paper);
    Printable printable = graph_table.getPrintable(JTable.PrintMode.NORMAL, null, null);

    try {
        PdfWriter writer;
        writer = PdfWriter.getInstance(doc, new FileOutputStream(save_pdf.getSelectedFile().getAbsoluteFile() + ".pdf"));

        writer.setViewerPreferences(PdfWriter.PageLayoutSinglePage);
        doc.open();
        int width = 375;
        int height = 300;

        JFreeChart chart = create_pie_chart_count();

        doc.add(new Paragraph("Some TExt", f));
        doc.add(new Paragraph("Some Text", f));
        doc.add(new Paragraph("Document Generated On - " + generatedDate, f));
        BufferedImage bufferedImage = chart.createBufferedImage(width, height);

        Image image = Image.getInstance(writer, bufferedImage, 1.0f);
        image.scalePercent(100f);
        image.setAlignment(image.MIDDLE);
        doc.add(image);
        PdfAction action = PdfAction.gotoLocalPage(1, pdfDest, writer);
        writer.setOpenAction(action);

            BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);

        Graphics2D g = img.createGraphics();

        int page = 0;

        int result = Printable.NO_SUCH_PAGE;

        PdfContentByte cb = writer.getDirectContent();
        do {
            result = printable.print(g, pf, page);
            if (result == Printable.PAGE_EXISTS) {
                cb.saveState();
                Graphics2D g2 = cb.createGraphics(650, 225);
                result = printable.print(g2, pf, page);
                g2.dispose();
                cb.restoreState();
                page++;
                doc.newPage();

            }

        } while (result == Printable.PAGE_EXISTS);
        g.dispose();
    } catch (Exception e) {
    } finally {
        doc.close();
    }
}

Answer 1

看看以下问题的答案:How to position a PDFGraphis2D object in iText?

正如您所看到的，通常不将图表或表格等对象直接绘制到直接内容。相反，您应该创建一个用于绘图的 PdfTemplate。使用 PdfTemplate 的好处之一是您可以将其包装在 Image 中。不用担心:如果 PdfTemplate 包含 vector 数据，则 Image 将是 vector 图像；它不会被光栅化(这会导致分辨率损失)。

一旦有了Image对象，就有许多不同的选项来调整它们的大小、位置和组织它们。在阅读以下问题的答案时，您可以了解不同的选项:

• How to display image and text beside each other Itext
• itextsharp images are not coming next to one another
• Add text and an alligned image to a ColumnText Itext
• ...