如何使用Java创建图表图像

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.category.DefaultCategoryDataset;

public class ChartExample {
    public static void main(String[] args) {
        // 准备数据
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(200, "Sales", "Product 1");
        dataset.addValue(300, "Sales", "Product 2");
        dataset.addValue(400, "Sales", "Product 3");

        // 创建图表对象
        JFreeChart chart = ChartFactory.createBarChart("Product Sales", "Product", "Sales", dataset);

        // 生成图像文件
        try {
            ChartUtilities.saveChartAsJPEG(new File("chart.jpg"), chart, 500, 300);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}