如何将图表插入pdf？ [英] How to insert graphs into a pdf?

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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