读取CSV文件，并使用MVC在图形中绘制值 [英] Reading in a CSV file, and plotting the values in a graph using MVC
问题描述
我尝试使用Java，JFreeChart和使用MVC概念将值从csv文件绘制到图形中。在一分钟，我创建了一个按钮，当这个按钮被点击它添加一个新的情节，但是，而不是这样做，我想它读取的值从csv文件，这是读入一个csv文件适配器并存储在模型中。我想知道是否有人可以帮助我这个。我将感谢任何可以提供的帮助。谢谢
I am trying to plot values from a csv file into a graph, using Java, JFreeChart and using the MVC concept. At the minute, I have created a button, and when this button is clicked it adds a new plot to the graph, however instead of doing this, I would like it to read in the values from the csv file, which is read in by a csv file adapter and stored in the model. I wondering if anyone could help me with this. I would appreciate any help that could be given. Thank you
//主类
public class Main
{
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Model model = new Model(0);
Controller controller = new Controller(model);
View view = new View(controller, "-");
view.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
view.setVisible(true);
}
});
}
}
// csv文件适配器
//csv file adapter
public List<Double> readFile(final String filename)
{
List<Double> result = new ArrayList<Double>();
String csvFile = filename;
BufferedReader br = null;
String line = "";
String splitBy = ",";
try {
br = new BufferedReader(new FileReader(csvFile));
while((line = br.readLine()) != null){
String[] test = line.split(splitBy);
System.out.println("csvFile [Value= " + test[0] + ", Value=" + test[1] + ", Value=" + test[2] + "]");
try
{
for (String val : test)
{
final Double valueToAdd = Double.parseDouble(val);
result.add(valueToAdd);
}
}
catch (NumberFormatException nfe)
{
System.out.println("Failed to parse line: " + line);
}
}
}
catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}finally{
if (br != null){
try{
br.close();
} catch (IOException e){
e.printStackTrace();
}
}
}
return result;
}
}
//模型
public class Model {
private int x;
public Model(){
x = 0;
}
public Model(int x){
this.x = x;
}
public void incX(){
x++;
}
public int getX(){
return x;
}
public void addDataset(final List<Double> data)
{
System.out.println("Added data to model");
for (Double d : data)
{
System.out.println("Value: " + d.toString());
}
}
}
//查看
public class View extends JFrame
{
private Controller controller;
private JFrame frame;
private JLabel label;
private JButton button;
private ChartDisplayWidget myChart;
public View(Controller c, String text){
this.controller = c;
getContentPane().setLayout(new BorderLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(1000,1000);
//label = new JLabel(text);
//getContentPane().add(label, BorderLayout.CENTER);
button = new JButton("Button");
getContentPane().add(button, BorderLayout.SOUTH);
button.addActionListener(new Action());
myChart = new ChartDisplayWidget();
getContentPane().add(myChart, BorderLayout.CENTER);
}
public class Action implements ActionListener {
public void actionPerformed (ActionEvent e){
System.out.println("I was clicked");
controller.control();
myChart.addTimeSeriesPerformancePlot("NewPlot", new Double[] {60.0, 40.0, 500.0, 10.0});
/*this is where I would like to plot the values from the csv file*/
}
}
public JButton getButton(){
return button;
}
public void setText(String text){
label.setText(text);
}
}
//controller
public class Controller {
public Model model;
public ActionListener actionListener;
public Controller(Model model){
this.model = model;
}
public void control(){
CSVFileAdapter c = new CSVFileAdapter();
model.addDataset(c.readFile("C:/dstat.csv"));
}
}
//图表显示小部件
//Chart Display Widget
public class ChartDisplayWidget extends JPanel
{
/**
*
*/
private static final long serialVersionUID = 1L;
private TimeSeriesCollection chartData;
private JFreeChart chart;
public ChartDisplayWidget()
{
init();
}
public void init()
{
final XYDataset dataset = getSampleData();
chart = ChartFactory.createTimeSeriesChart(
"Our test chart",
"Time",
"Some Value",
dataset);
final ChartPanel chartPanel = new ChartPanel(chart);
add(chartPanel);
}
public void addTimeSeriesPerformancePlot(final String plotName, final Double[] values)
{
final TimeSeries newSeries = new TimeSeries(plotName);
int arrLen = values.length;
int monthIndex = 2;
int yearIndex = 2001;
for (int index = 0; index < arrLen; index++)
{
newSeries.add(new Month(monthIndex++, yearIndex++), values[index]);
}
chartData.addSeries(newSeries);
}
private XYDataset getSampleData()
{
TimeSeries s1 = new TimeSeries("Max CPU");
s1.add(new Month(2, 2001), 181.5);
s1.add(new Month(3, 2001), 20.5);
s1.add(new Month(4, 2001), 1.1);
s1.add(new Month(5, 2001), 81.5);
s1.add(new Month(6, 2001), 1181.5);
s1.add(new Month(7, 2001), 1081.5);
TimeSeries s2 = new TimeSeries("Disk I/O");
s2.add(new Month(2, 2001), 50.0);
s2.add(new Month(3, 2001), 55.0);
s2.add(new Month(4, 2001), 60.6);
s2.add(new Month(5, 2001), 70.8);
s2.add(new Month(6, 2001), 1000.1);
s2.add(new Month(7, 2001), 1081.5);
chartData = new TimeSeriesCollection();
chartData.addSeries(s1);
chartData.addSeries(s2);
return chartData;
}
}
推荐答案
观察者模式 ：更新模型 ，未指定的实现 XYDataset ，并且监听视图将自动更新。您可以在此处和此处查看示例。由于文件延迟本质上是不可预测的，请阅读 SwingWorker ， publish（）中间结果，并更新 code> process（）; <此处显示 JFreeChart 示例。
Use the observer pattern: update the model, an unspecified implementation XYDataset, and the listening view will update itself in response. Examples are seen here and here. Because file latency is inherently unpredictable, read the file in the background thread of a SwingWorker, publish() intermediate results, and update the model in process(); a JFreeChart example is shown here.
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