Java 使用 Itext 更改 PDF 的方向
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/23381148/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Changing the orientation of PDF using Itext
提问by Vikram
I have done creating pdf and chart with the help of this link http://viralpatel.net/blogs/generate-pie-chart-bar-graph-in-pdf-using-itext-jfreechart/.
我已经在此链接的帮助下创建了 pdf 和图表http://viralpatel.net/blogs/generate-pie-chart-bar-graph-in-pdf-using-itext-jfreechart/。
package net.viralpatel.pdf;
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.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import com.itextpdf.text.Document;
import com.itextpdf.text.pdf.DefaultFontMapper;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;
public class PieChartDemo {
public static void main(String[] args) {
//TODO: Add code to generate PDFs with charts
writeChartToPDF(generateBarChart(), 500, 400, "C://barchart.pdf");
writeChartToPDF(generatePieChart(), 500, 400, "C://piechart.pdf");
}
public static void writeChartToPDF(JFreeChart chart, int width, int height, String fileName) {
PdfWriter writer = null;
Document document = new Document();
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 generatePieChart() {
DefaultPieDataset dataSet = new DefaultPieDataset();
dataSet.setValue("China", 19.64);
dataSet.setValue("India", 17.3);
dataSet.setValue("United States", 4.54);
dataSet.setValue("Indonesia", 3.4);
dataSet.setValue("Brazil", 2.83);
dataSet.setValue("Pakistan", 2.48);
dataSet.setValue("Bangladesh", 2.38);
JFreeChart chart = ChartFactory.createPieChart(
"World Population by countries", dataSet, true, true, false);
return chart;
}
public static JFreeChart generateBarChart() {
DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
dataSet.setValue(791, "Population", "1750 AD");
dataSet.setValue(978, "Population", "1800 AD");
dataSet.setValue(1262, "Population", "1850 AD");
dataSet.setValue(1650, "Population", "1900 AD");
dataSet.setValue(2519, "Population", "1950 AD");
dataSet.setValue(6070, "Population", "2000 AD");
JFreeChart chart = ChartFactory.createBarChart(
"World Population growth", "Year", "Population in millions",
dataSet, PlotOrientation.VERTICAL, false, true, false);
return chart;
}
}
}
Now how to change the orientation of the pdf from prtrait to landscape?
现在如何将 pdf 的方向从 prtrait 更改为横向？
回答by Bruno Lowagie
When you create a Documentobject like this:
当您创建这样的Document对象时：
Document document = new Document();
You tell iText to create a document with pages of the A4 format using Portrait orientation. You can add a Rectangleobject as a parameter of the Documentconstructor to create documents with pages in any size you want.
您告诉 iText 使用纵向方向创建一个包含 A4 格式页面的文档。您可以添加一个Rectangle对象作为Document构造函数的参数，以创建具有任意大小页面的文档。
You can also use the PageSizeclass to use a predefined format. For instance: if you want to use an A4 page in landscape, you'd use this:
您还可以使用PageSize该类来使用预定义的格式。例如：如果你想在横向使用 A4 页面，你可以使用这个：
Document document = new Document(PageSize.A4.rotate());
Please download the free eBook "The ABC of PDF"for more info.
请下载免费电子书“PDF 的 ABC”以获取更多信息。
