从 JFreeChart 到图像文件的服务器端/非交互式图表渲染

Question

如何以编程方式呈现来自 JFreeChart 的图像文件。我有 ChartPanel 的代码：是否可以直接渲染图像 - 无需创建 AWT/GUI 组件？

val chart = ..  // Imagine code to generate chart data here..
val panel = new ChartPanel(chart)
panel.renderToImage() // replace this with logic to save image file

Answer 1

使用 ChartUtilities methods, such as writeChartAsJPEG() or writeChartAsPNG(), that can write to a java.io.OutputStream; or saveChartAsJPEG() or saveChartAsPNG(), that can write to a java.io.File. Some examples are seen here and here 之一。例如，

ChartUtilities.saveChartAsPNG(new File("chart.png"), chart, width, height);

您还想研究无头模式，提到了 here。

从 JFreeChart 到图像文件的服务器端/非交互式图表渲染

Server-side/ non-interactive rendering of Charts to image files from JFreeChart

java

jfreechart