jfreechart里当没有数据显示时的处理

使用JFreeChart创建时间序列图表

最新推荐文章于 2022-08-15 16:38:43 发布

最新推荐文章于 2022-08-15 16:38:43 发布 · 462 阅读

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本文介绍如何使用JFreeChart库创建时间序列图表，包括数据组织、图表配置及输出流程。

public class JFreeChart1 extends HttpServlet {

private static final long serialVersionUID = 1L;

public JFreeChart1() {
super();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

TimeSeries xyseries = new TimeSeries("finince income", Month.class);

TimeSeriesCollection xyseriescollection = new TimeSeriesCollection();
xyseriescollection.addSeries(xyseries);

  JFreeChart jfreechart = ChartFactory.createTimeSeriesChart("Example",
    "y", "x", xyseriescollection, true, true, true);
  jfreechart.setBackgroundPaint(Color.white);
  XYPlot xyplot = jfreechart.getXYPlot();

  xyplot.setNoDataMessage("no data to display");// 此名可用来做当没有数据的时候jfreechart面板上的显示

    StandardEntityCollection sec = new StandardEntityCollection();
  ChartRenderingInfo info = new ChartRenderingInfo(sec);

ChartUtilities.writeChartAsPNG(response.getOutputStream(), jfreechart,
600, 400, info);
}

}