在另一个PDF文件的可用空间附加PDF [英] Append PDF at the available space of another PDF file

问题描述

Viral Patel的教程关于如何合并和拆分PDF文件很有用。不幸的是，我需要的不仅仅是合并文件，而是将PDF附加到另一个PDF。

Viral Patel's tutorial on how to merge and split PDF files is useful. Unfortunately, I need something more than merging the files but appending a PDF to another PDF.

我正在生成报告，一个组件是使用 JFreeChart s。我制作的图表变成PDF并通过合并代码再次读取。我们假设我有 main.pdf 用于文本和表格PDF和 chart.pdf 用于后者。

I am generating reports and one component is a graph using JFreeCharts. The graph I make is turned into PDF and read again by the merge code. Let us say I have main.pdf for the text and tables PDF and chart.pdf for the latter.

我确定 main.pdf 有一个额外的空间，另一个数字可以容纳到 chart.pdf 我希望后者可以缩放并放在那里而不会在另一页中膨胀。

I am certain that main.pdf has an extra space that another figure can fit into which is chart.pdf and I want the latter to be scaled and placed there and not bloated in another page.

我有下面的代码和我似乎无法实现这一点：

I have the code below and I can't seem to implement this:

• 要创建的代码 chart.pdf

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.FileOutputStream;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.DefaultCategoryDataset;

import com.lowagie.text.Document;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.DefaultFontMapper;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;

public class ChartDemo {
    public static void main(String[] args) {
        writeChartToPDF(generateBarChart(), 500, 400, "D://chart.pdf");
    }

    public static void writeChartToPDF(JFreeChart chart, int width, int height,
            String fileName) {
        PdfWriter writer = null;
        Document document = new Document(new Rectangle(width, height));

        try {
            writer = PdfWriter.getInstance(document, new FileOutputStream(
                    fileName));
            document.open();
            PdfContentByte contentByte = writer.getDirectContent();

            PdfTemplate template = contentByte.createTemplate(width, height);
            Graphics2D graphics2d = template.createGraphics(width, height,
                    new DefaultFontMapper());
            Rectangle2D rectangle2d = new Rectangle2D.Double(0, 0, width,
                    height);

            chart.draw(graphics2d, rectangle2d);

            graphics2d.dispose();
            contentByte.addTemplate(template, 0, 0);

        } catch (Exception e) {
            e.printStackTrace();
        }
        document.close();
    }

    public static JFreeChart generateBarChart() {
        DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
        dataSet.setValue(100, "Population", "2");
        dataSet.setValue(78, "Population", "4");
        dataSet.setValue(62, "Population", "6");
        dataSet.setValue(50, "Population", "8");
        dataSet.setValue(39, "Population", "10");

        JFreeChart chart = ChartFactory.createBarChart("", "Team number",
                "Solved problems (%)", dataSet, PlotOrientation.VERTICAL,
                false, true, false);
        chart.setBackgroundPaint(Color.WHITE);

        final CategoryPlot plot = chart.getCategoryPlot();
        plot.setBackgroundPaint(Color.WHITE);
        plot.setDomainGridlinePaint(new Color(204, 204, 204));
        plot.setRangeGridlinePaint(new Color(204, 204, 204));

        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

        final BarRenderer renderer1 = (BarRenderer) plot.getRenderer();
        renderer1.setDrawBarOutline(false);
        renderer1.setShadowVisible(false);
        renderer1.setDrawBarOutline(false);
        renderer1.setSeriesPaint(0, Color.gray);
        renderer1.setSeriesPaint(1, Color.RED);

        return chart;
    }
}

合并代码

code for merging

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.lowagie.text.Document;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;

public class MergePdf {

    public static void main(String[] args) {
        try {
            List<InputStream> pdfs = new ArrayList<InputStream>();
            pdfs.add(new FileInputStream("D:\\main.pdf"));
            pdfs.add(new FileInputStream("D:\\chart.pdf"));
            OutputStream output = new FileOutputStream("D:\\merge.pdf");
            MergePdf.concatPDFs(pdfs, output, true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void concatPDFs(List<InputStream> streamOfPDFFiles,
            OutputStream outputStream, boolean paginate) {

        Document document = new Document();
        try {
            List<InputStream> pdfs = streamOfPDFFiles;
            List<PdfReader> readers = new ArrayList<PdfReader>();
            int totalPages = 0;
            Iterator<InputStream> iteratorPDFs = pdfs.iterator();

            // Create Readers for the pdfs.
            while (iteratorPDFs.hasNext()) {
                InputStream pdf = iteratorPDFs.next();
                PdfReader pdfReader = new PdfReader(pdf);
                readers.add(pdfReader);
                totalPages += pdfReader.getNumberOfPages();
            }
            // Create a writer for the outputstream
            PdfWriter writer = PdfWriter.getInstance(document, outputStream);

            document.open();
            BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
                    BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
            PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
            // data

            PdfImportedPage page;
            int currentPageNumber = 0;
            int pageOfCurrentReaderPDF = 0;
            Iterator<PdfReader> iteratorPDFReader = readers.iterator();

            // Loop through the PDF files and add to the output.
            while (iteratorPDFReader.hasNext()) {
                PdfReader pdfReader = iteratorPDFReader.next();

                // Create a new page in the target for each source page.
                while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
                    document.newPage();
                    pageOfCurrentReaderPDF++;
                    currentPageNumber++;
                    page = writer.getImportedPage(pdfReader,
                            pageOfCurrentReaderPDF);
                    cb.addTemplate(page, 0, 0);

                    // Code for pagination.
                    if (paginate) {
                        cb.beginText();
                        cb.setFontAndSize(bf, 9);
                        cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
                                + currentPageNumber + " of " + totalPages, 520,
                                5, 0);
                        cb.endText();
                    }
                }
                pageOfCurrentReaderPDF = 0;
            }
            outputStream.flush();
            document.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (document.isOpen())
                document.close();
            try {
                if (outputStream != null)
                    outputStream.close();
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
        }
    }
}

推荐答案

我的答案并没有直接回答你的答案，但它涵盖了你想要的输出 - 有一个 JFreeChart 图表 iText PDF。

My answer does not directly answer yours but it covers your desired output - the have a JFreeChart chart within an iText PDF.

我看到这个惊人的，现货 - 关于如何使用 JFreeChart 制作 iText PDF的教程： WireLust的使用嵌入式JFreeChart创建iText pdf 。请注意，这使用servlet，我将其修改为一个独立的代码，使用 iText 和 JFreeCharts 进行处理。

I saw this amazing, spot-on tutorial on how to make an iText PDF with JFreeChart inside: WireLust's "Creating an iText pdf with embedded JFreeChart". Note that this uses servlets and I modified it to just be a standalone code with the iText and JFreeCharts to work on.

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.FileOutputStream;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.DefaultFontMapper;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;

/**
 * Approaching Pi, Inc. http://www.approachingpi.com
 * <p/>
 * User: tcurran Date: Mar 17, 2008 Time: 2:29:43 AM Desc:
 */
public class PdfChartDemo {

    public static void main(String[] args) throws DocumentException {

        try {
            Document doc = new Document(PageSize.A4);
            PdfWriter docWriter = PdfWriter.getInstance(doc,
                    new FileOutputStream("D:/helix-fossil.pdf"));
            doc.open();

            doc.addProducer();
            doc.addCreator("Jay Leno");
            doc.addTitle("jfreechart pdf");
            doc.setPageSize(PageSize.LETTER);

            doc.open();

            // add some text to the document
            doc.add(new Phrase(
                    "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod "
                            + "tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, "
                            + "quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. "
                            + "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu "
                            + "fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, "
                            + "sunt in culpa qui officia deserunt mollit anim id est laborum."));

            // build up the dataset for the chart
            XYSeriesCollection dataset = new XYSeriesCollection();

            XYSeries series = new XYSeries("XYGraph");
            series.add(1, 1);
            series.add(2, 3);
            series.add(3, 9);
            series.add(4, 11);

            dataset.addSeries(series);

            // set up the chart
            JFreeChart chart = ChartFactory.createXYLineChart(
                    "XY Chart Sample, non default font", // chart title
                    "x-axis", // domain axis label
                    "y-axis", // range axis label
                    dataset, // data
                    PlotOrientation.VERTICAL, // orientation
                    true, // include legend
                    true, // tooltips
                    false // urls
                    );

            // trick to change the default font of the chart
            chart.setTitle(new TextTitle("XY Chart Sample, non default font",
                    new java.awt.Font("Serif", Font.BOLD, 12)));
            chart.setBackgroundPaint(Color.white);
            chart.setBorderPaint(Color.black);
            chart.setBorderStroke(new BasicStroke(1));
            chart.setBorderVisible(true);

            int width = 260;
            int height = 250;

            // get the direct pdf content
            PdfContentByte dc = docWriter.getDirectContent();

            // get a pdf template from the direct content
            PdfTemplate tp = dc.createTemplate(width, height);

            // create an AWT renderer from the pdf template
            Graphics2D g2 = tp.createGraphics(width, height,
                    new DefaultFontMapper());
            Rectangle2D r2D = new Rectangle2D.Double(0, 0, width, height);
            chart.draw(g2, r2D, null);
            g2.dispose();

            // add the rendered pdf template to the direct content
            // you will have to play around with this because the chart is
            // absolutely positioned.
            // 38 is just a typical left margin
            // docWriter.getVerticalPosition(true) will approximate the position
            // that the content above the chart ended
            dc.addTemplate(tp, 38, docWriter.getVerticalPosition(true) - height);

            doc.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

它将会生成与servlet版本相同的PDF文件。

It will produce the same PDF file as with the servlet version.

这篇关于在另一个PDF文件的可用空间附加PDF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！