Viral Patel's tutorial非常有用。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。
我正在生成报告，而一个组件是使用JFreeChart的图表。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。
我确信main.pdf有一个额外的空间，另一个数字可以放入chart.pdf，我希望后者可以缩放并放在那里而不会在另一个页面中膨胀。
我有下面的代码，我似乎无法实现这一点：
创建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
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();
}
}
}
}
答案 0 :(得分：2)
我的回答并未直接回答您的问题，但它涵盖了您所需的输出 - 在 <{1}} PDF中有JFreeChart图表。
我看到了这个惊人的现场教程，内容是如何在iText里面制作iText PDF：WireLust's "Creating an iText pdf with embedded JFreeChart"。请注意，这使用了servlet，我将其修改为仅使用JFreeChart和iText的独立代码。
JFreeCharts它将生成与servlet版本相同的PDF文件。