使用jfreechart画曲线图

￡神魔★判官ぃ 2022-05-27 01:44 359阅读 0赞

**pom：**

<dependency>
    <groupId>org.jfree</groupId>
      <artifactId>jfreechart</artifactId>
      <version>1.5.0</version>
    </dependency>
    
    <dependency>
      <groupId>org.jfree</groupId>
      <artifactId>jcommon</artifactId>
      <version>1.0.24</version>
    </dependency>

**代码：**

/** * 曲线图 * * @author wzx * @date 2018-04-09 */
    public class TimeSeriesChart { 
    
        public static void main(String[] args) throws IOException {
            XYDataset xyDataset = createDataset();
            JFreeChart chart = ChartFactory.createTimeSeriesChart("小时/点击数", "小时", "点击数",
                    xyDataset, true, true, true);
            XYPlot plot = (XYPlot) chart.getPlot();
            DateAxis dateaxis = (DateAxis) plot.getDomainAxis();
            dateaxis.setDateFormatOverride(new SimpleDateFormat("HH:mm"));
            dateaxis.setLabelFont(new Font("黑体", Font.BOLD, 14));         //水平底部标题
            dateaxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12));  //垂直标题
            ValueAxis rangeAxis = plot.getRangeAxis();//获取柱状
            rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));
            chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));
            chart.getTitle().setFont(new Font("宋体", Font.BOLD, 20));//设置标题字体
    
            FileOutputStream out = null;
            try {
                out = new FileOutputStream("C://image//2.jpg");
                ChartUtils.writeChartAsJPEG(out, 0.5f, chart, 400, 300, null);
            } finally {
                try {
                    out.close();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
    
        private static XYDataset createDataset() {
            TimeSeries timeseries = new TimeSeries("点击数");
            timeseries.add(new Month(2, 2001), 181.80000000000001D);
            timeseries.add(new Month(3, 2001), 167.30000000000001D);
            timeseries.add(new Month(4, 2001), 153.80000000000001D);
            timeseries.add(new Month(5, 2001), 167.59999999999999D);
            timeseries.add(new Month(6, 2001), 158.80000000000001D);
            timeseries.add(new Month(7, 2001), 148.30000000000001D);
            timeseries.add(new Month(8, 2001), 153.90000000000001D);
            timeseries.add(new Month(9, 2001), 142.69999999999999D);
            timeseries.add(new Month(10, 2001), 123.2D);
            timeseries.add(new Month(11, 2001), 131.80000000000001D);
            timeseries.add(new Month(12, 2001), 139.59999999999999D);
            timeseries.add(new Month(1, 2002), 142.90000000000001D);
            timeseries.add(new Month(2, 2002), 138.69999999999999D);
            timeseries.add(new Month(3, 2002), 137.30000000000001D);
            timeseries.add(new Month(4, 2002), 143.90000000000001D);
            timeseries.add(new Month(5, 2002), 139.80000000000001D);
            timeseries.add(new Month(6, 2002), 137D);
            timeseries.add(new Month(7, 2002), 132.80000000000001D);
            TimeSeriesCollection timeseriescollection = new TimeSeriesCollection();
            timeseriescollection.addSeries(timeseries);
            return timeseriescollection;
        }
    }

生成的图片：