Java如何调用数据库中的数据画图

你需要下载导入JFREECHART的jar包

然后下面是一个例子

import orgjfreechartChartFactory;

import orgjfreechartChartPanel;

import orgjfreechartJFreeChart;

import orgjfreechartplotPlotOrientation;

import orgjfreedataxyXYSeries;

import orgjfreedataxyXYSeriesCollection;

import orgjfreeuiApplicationFrame;

import orgjfreeuiRefineryUtilities;

public class XYSeriesDemo extends ApplicationFrame {

/

A demonstration application showing an XY series containing a null value

@param title the frame title

/

public XYSeriesDemo(final String title) {

super(title);

final XYSeries series = new XYSeries("Random Data");

seriesadd(10, 5002);

seriesadd(50, 6941);

seriesadd(40, 1000);

seriesadd(125, 7344);

seriesadd(173, 4532);

seriesadd(212, 5002);

seriesadd(219, null);

seriesadd(256, 7344);

seriesadd(300, 4532);

final XYSeriesCollection data = new XYSeriesCollection(series);

final JFreeChart chart = ChartFactorycreateXYLineChart(

"XY Series Demo",

"X",

"Y",

data,

PlotOrientationVERTICAL,

true,

true,

false

);

final ChartPanel chartPanel = new ChartPanel(chart);

chartPanelsetPreferredSize(new javaawtDimension(500, 270));

setContentPane(chartPanel);

}

public static void main(final String[] args) {

final XYSeriesDemo demo = new XYSeriesDemo("XY Series Demo");

demopack();

RefineryUtilitiescenterFrameOnScreen(demo);

demosetVisible(true);

}

}

seriesadd(10, 5002);10，5002分别是横坐标和纵坐标数值 它会自动产生横竖坐标的

setDefaultCloseOperation 为JFrameHIDE_ON_CLOSE不行吗？

那试试把chartPanel显示在JFrame里吧，不用ApplicationFrame

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