问题描述
我想绘制两个图表,显示带有标签的堆积条形图,用Java编写PDF文件。我会从Mongodb获取数据以输入图形。该怎么做?
I would like to draw two graphs showing stacked bar graphs with labels, into a PDF file in Java. I would get the data from a Mongodb for input to graphs. How to do that?
推荐答案
使用JFreechart和pdfbox我做了类似于你要求我做一次报告的内容。制作饼图如下:
Using JFreechart and pdfbox I have done something similar to what you are requesting for a report I made once. Making a pie chart was as follows:
public class PieChartExample {
public static void main(String[] args) {
// Create a simple pie chart
DefaultPieDataset pieDataset = new DefaultPieDataset();
pieDataset.setValue("Chrome", new Integer(42));
pieDataset.setValue("Explorer", new Integer(24));
pieDataset.setValue("Firefox", new Integer(24));
pieDataset.setValue("Safari", new Integer(12));
pieDataset.setValue("Opera", new Integer(8));
JFreeChart chart = ChartFactory.createPieChart3D(
"Browser Popularity", // Title
pieDataset, // Dataset
true, // Show legend
true, // Use tooltips
false // Configure chart to generate URLs?
);
try {
ChartUtilities.saveChartAsJPEG(new File("C:\\Users\\myname\\Desktop\\chart.jpg"), chart, 500, 300);
} catch (Exception e) {
System.out.println("Problem occurred creating chart.");
}
}
}
上面的例子来自于pdf我认为可以在他们的网站上找到,如果你需要,它有其他图表的例子。保存后,我可以将其导入pdf,类似于:
The above example came from a pdf I think is available on their website, it has examples for other charts if you need them. Once saved, I could import it to the pdf similarly to this:
try {
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDPage.PAGE_SIZE_A4);
document.addPage(page);
InputStream in = new FileInputStream(new File("c:/users/myname/desktop/chart.jpg"));
PDJpeg img = new PDJpeg(document, in);
PDPageContentStream contentStream = new PDPageContentStream(document, page);
contentStream.drawImage(img, 10, 300);
contentStream.close();
document.save("pathway/to/save.pdf");
} catch (IOException e) {
System.out.println(e);
} catch (COSVisitorException cos) {
System.out.println(cos);
}
itext也是一个很好的pdf操作库,但是点而pdfbox应该是开源的。
itext is also a good library for pdf manipulation, but that is commercial after a point whereas pdfbox should be open source.
祝你好运!
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