使用Itext 5定位JFreeChart图像

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfWriter;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;

public class PdfChartExample {
    public static void main(String[] args) {
        // 创建图表数据集
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Category 1", 50);
        dataset.setValue("Category 2", 30);
        dataset.setValue("Category 3", 20);

        // 创建图表对象
        JFreeChart chart = ChartFactory.createPieChart("Chart Title", dataset, true, true, false);

        // 将图表转换为BufferedImage
        BufferedImage bufferedImage = chart.createBufferedImage(500, 300);

        // 创建PDF文档
        Document document = new Document();

        try {
            // 创建PdfWriter并将内容写入文档
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("chart.pdf"));
            document.open();

            // 获取PDF文档的内容写入器
            PdfContentByte contentByte = writer.getDirectContent();

            // 创建图像对象
            Image image = Image.getInstance(writer, bufferedImage, 1.0f);
            image.setAbsolutePosition(100, 100); // 设置图像的位置

            // 将图像添加到PDF文档中
            contentByte.addImage(image);

            document.close();
            writer.close();
        } catch (DocumentException | IOException e) {
            e.printStackTrace();
        }
    }
}