如何使用时间戳在Java中导入和绘制CSV
嗨目前我正在尝试将CSV文件导入Java以绘制数据，基本上，我可以成功导入但它在我的CSV中不起作用，因为它的时间格式为： HH:mm:ss MM-dd-yy
数据如下：
2016-05-15 00:00:00 0 2016-05-15 00:00:00 0 2016-05-15 00:00:00 5.44852 2016-05-15 00:00:01 0 2016-05-15 00:00:01 0 2016-05-15 00:00:01 5.26064
代码如下：
import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.text.SimpleDateFormat; import org.jfree.chart.axis.DateAxis; import org.jfree.data.time.Minute; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; import org.jfree.chart.renderer.xy.StandardXYItemRenderer; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; import au.com.bytecode.opencsv.CSVReader; public class Test extends ApplicationFrame{ /** * */ private static final long serialVersionUID = 1L; XYSeriesCollection dataset; JFreeChart chart; final ChartPanel chartPanel; final int chartWidth = 560; final int chartHeight = 367; CSVReader reader; String[] readNextLine; XYSeries series; public Test(String applicationTitle) throws IOException { super(applicationTitle); dataset = createDataset(); chart = createChart(dataset); chartPanel = new ChartPanel(chart); chartPanel.setPreferredSize(new java.awt.Dimension(chartHeight, chartWidth)); this.add(chartPanel); } public XYSeriesCollection createDataset() throws NumberFormatException, IOException { dataset = new XYSeriesCollection(); try { reader = new CSVReader(new FileReader("/usr/csv_dump.csv"),'\t'); // Read the header and chuck it away readNextLine = reader.readNext(); // Set up series final XYSeries seriesX = new XYSeries("X"); final XYSeries seriesY = new XYSeries("Y"); final XYSeries seriesZ = new XYSeries("Z"); while ((readNextLine = reader.readNext()) != null) { // add values to dataset double Time = Double.valueOf(readNextLine[0]); double X = Long.valueOf(readNextLine[1]); double Y = Long.valueOf(readNextLine[2]); double Z = Long.valueOf(readNextLine[3]); seriesX.add(Time, X); seriesY.add(Time, Y); seriesZ.add(Time, Z); } System.out.println(seriesX.getMaxX() + "; " + seriesX.getMaxY()); dataset.addSeries(seriesX); dataset.addSeries(seriesY); dataset.addSeries(seriesZ); } catch (FileNotFoundException e) { System.out.println("File not found!"); } return dataset; } public JFreeChart createChart(XYDataset dataset) throws NumberFormatException, IOException { chart = ChartFactory.createXYLineChart("Acceleration vs Time", // chart // title "Time", // domain axis label "Acceleration", // range axis label dataset, // data PlotOrientation.VERTICAL, // the plot orientation true, // legend true, // tooltips false); // urls return chart; } public static void main(String[] args) throws IOException { System.out.println("In here, to create a Test"); final Test demo = new Test("Test XY Line chart"); System.out.println("Created, pakcking"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); }
}
但我不知道如何在这段代码中加入时间格式。 感谢任何可以帮助我的人。
在这个更简单的例子中，
-
使用
SimpleDateFormat来解析给定格式的日期。 -
使用
ChartFactory.createTimeSeriesChart()创建时间序列图表; 它将使用DateAxis作为域。
数据：
2016-05-15 00:00:00, 20 2016-05-15 00:01:01, 21 2016-05-15 00:02:02, 42
码：
import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class Test extends ApplicationFrame { public Test(String applicationTitle) throws IOException { super(applicationTitle); this.add(new ChartPanel(createChart(createDataset()))); } public XYSeriesCollection createDataset() { final XYSeries series = new XYSeries("X"); try { BufferedReader in = new BufferedReader(new FileReader("data.txt")); SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String s = null; while ((s = in.readLine()) != null) { String[] a = s.split(","); Date d = f.parse(a[0]); int v = Integer.valueOf(a[1].trim()); series.add(d.getTime(), v); } } catch (IOException | ParseException e) { e.printStackTrace(System.err); } return new XYSeriesCollection(series); } public JFreeChart createChart(XYDataset dataset) throws NumberFormatException, IOException { JFreeChart chart = ChartFactory.createTimeSeriesChart( "Acceleration vs Time", "Time", "Acceleration", dataset, true, true, false); return chart; } public static void main(String[] args) throws IOException { final Test demo = new Test("Test Time Series Chart"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }