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java - 从 BufferedReader 接收数据时延迟图形显示

问题描述

我对 JFreeChart 有一个非常严重的问题。我们在 Tinker Board 上用 C 语言编写了一个程序，该程序从 ADXL355 传感器获取数据并将其显示在 shell 中。然后，使用我们用 Java 编写的程序，我们使用缓冲读取器接收数据并将其显示在图表中。当我们只在输出中打印接收到的数据时是没有问题的；但是当我们将数据发送到图表进行显示时，它会延迟 30 秒显示，并且该延迟会随着时间的推移而增加。

我们使用JFrame表格；这是Java方面：

package client_time;

import com.bulenkov.darcula.DarculaLaf;
import com.mysql.jdbc.Connection;
import java.awt.Color;
import java.awt.FlowLayout;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.swing.Timer;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.time.Millisecond;
import org.jfree.data.time.Second;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.omg.CORBA.TIMEOUT;


public class cha_time extends javax.swing.JFrame {
    
    public  TimeSeries TSx , TSy , TSz ;
    public  TimeSeriesCollection DataSetx , DataSety , DataSetz  ; 
    public  int x = 0 ;
    public  double Give_doubleX , Give_doubleY , Give_doubleZ ;
    public String Give_stringX , Give_stringY , Give_stringZ;
    public boolean Statuse = true ;
    public String line;
    public BufferedReader BR;
    public Process process;
    public InputStreamReader isr;
    public int i = 0 ;
    public  cha_time() {
        initComponents();
        line = "";
        Give_doubleX = 0.0;
        Give_doubleY = 0.0;
        Give_doubleZ = 0.0;
        
        
             TSx = new TimeSeries("", Millisecond.class);
              TSy = new TimeSeries("", Millisecond.class);
               TSz = new TimeSeries("", Millisecond.class);
             
             DataSetx =  new TimeSeriesCollection(TSx);
             DataSety =  new TimeSeriesCollection(TSy);
             DataSetz =  new TimeSeriesCollection(TSz);
            
             JFreeChart chartX = ChartFactory.createTimeSeriesChart("","", "",DataSetx ,true, true, false);
             JFreeChart chartY = ChartFactory.createTimeSeriesChart("","", "",DataSety ,true, true, false);
             JFreeChart chartZ = ChartFactory.createTimeSeriesChart("","", "",DataSetz ,true, true, false);
 //********************************************** X ***********************************************************************
                chartX.getPlot().setBackgroundPaint( Color.BLACK );
                XYPlot plotX =  chartX.getXYPlot();     
                ValueAxis axisX = plotX.getDomainAxis();
        axisX.setAutoRange(true);
        axisX.setFixedAutoRange(50000.0); 
        axisX = plotX.getRangeAxis();
        axisX.setAutoRange(true);
                XYPlot xyPlotX = (XYPlot) chartX.getPlot();// LINE color
                XYItemRenderer rendererX = xyPlotX.getRenderer();// LINE color
                rendererX.setSeriesPaint(0, Color.GREEN);// LINE color
 //*******************************************************************************************************************   
 //********************************************** Y ***********************************************************************  
                chartY.getPlot().setBackgroundPaint( Color.BLACK );
                XYPlot plotY =  chartY.getXYPlot();     
                ValueAxis axisY = plotY.getDomainAxis();
        axisY.setAutoRange(true);
        axisY.setFixedAutoRange(50000.0);
        axisY = plotY.getRangeAxis();
        axisY.setAutoRange(true);
                XYPlot xyPlotY = (XYPlot) chartY.getPlot();// LINE color
                XYItemRenderer rendererY = xyPlotY.getRenderer();// LINE color
                rendererY.setSeriesPaint(0, Color.magenta);// LINE color
 //*******************************************************************************************************************  
 //********************************************** Z *********************************************************************** 
                chartZ.getPlot().setBackgroundPaint( Color.BLACK );
                XYPlot plotZ =  chartZ.getXYPlot();     
                ValueAxis axisZ = plotZ.getDomainAxis();
        axisZ.setAutoRange(true);
        axisZ.setFixedAutoRange(50000.0); 
        axisZ = plotZ.getRangeAxis();
        axisZ.setAutoRange(true);
                XYPlot xyPlotZ = (XYPlot) chartZ.getPlot();// LINE color
                XYItemRenderer rendererZ = xyPlotZ.getRenderer();// LINE color
                rendererZ.setSeriesPaint(0, Color.ORANGE);// LINE color
 
           ChartPanel chpax = new ChartPanel(chartX,700, 150, 100, 100, 1000, 300, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled);//hatman bayad yek nemone az on sakhte beshe
           ChartPanel chpay = new ChartPanel(chartY,700, 150, 100, 100, 1000, 300, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled);//hatman bayad yek nemone az on sakhte beshe
           ChartPanel chpaz = new ChartPanel(chartZ,700, 150, 100, 100, 1000, 300, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled, rootPaneCheckingEnabled);//hatman bayad yek nemone az on sakhte beshe
           jPanel1.setLayout(new FlowLayout());
           jPanel2.setLayout(new FlowLayout());
           jPanel3.setLayout(new FlowLayout());
           jPanel1.add(chpax);
           jPanel2.add(chpay);
           jPanel3.add(chpaz);
           
       
    }

                         

    private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                               
      
        if(jToggleButton1.isSelected())
        {
            jToggleButton1.setText("DIS");
            
            ////////////////////////////////////////// Setup pipe //////////////////////////////////////////
try{
   //  process = Runtime.getRuntime().exec("/home/linaro/hopo/output" ); we try by this But it did not matter
       
 
                  ProcessBuilder processBuilder = new ProcessBuilder();
                  processBuilder.command("/home/linaro/hopo/output");
                  process =  processBuilder.start();
                  isr = new InputStreamReader(process.getInputStream());
                  BR = new BufferedReader(isr) ;
                 
}catch(Exception ex){System.out.println(ex);}  
            
                 Thread t = new Thread(new Runnable()
                 {
                   @Override
                  public void run()
                  {
    /////////////////////////////////////////////// WHILE ////////////////////////////////////////////////
            while(jToggleButton1.getText().equals("DIS")){
    ///////////////////////////////////////////// PIPE START /////////////////////////////////////////////
               
try {
             
              line = BR.readLine();
              System.out.println(line);
              
              Give_stringX = line.substring(0,12).toString().trim(); 
              Give_stringY = line.substring(14,26).toString().trim(); 
              Give_stringZ = line.substring(28,42).toString().trim(); 
            
                    Give_doubleX =   Double.parseDouble(Give_stringX);
                    Give_doubleY =   Double.parseDouble(Give_stringY);
                    Give_doubleZ =   Double.parseDouble(Give_stringZ);
                    
                    TSx.addOrUpdate(new Millisecond(), Give_doubleX);
                    TSy.addOrUpdate(new Millisecond(), Give_doubleY);
                    TSz.addOrUpdate(new Millisecond(), Give_doubleZ);
                   
                } catch (Exception ex) { //SQLException
                    System.out.println(ex);
                }
               
                }// END OF WHILE
            
        }
    });
    t.start();
            
        
        }else if(!jToggleButton1.isSelected())
        {
            try{
             process.destroy();
             process.destroyForcibly();
             isr.close();
             BR.close();
             jToggleButton1.setText("CO");
             System.out.println("goodbay");
             TSx.clear();
             TSy.clear();
             TSz.clear();
            }catch(Exception ex)
            {
                System.out.println(ex);
            }
            
        }
     
    }                                              

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Metal".equals(info.getName())) {
                     javax.swing.UIManager.setLookAndFeel(new DarculaLaf());
                    break;
                }
            }
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(cha_time.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new cha_time().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JToggleButton jToggleButton1;
    // End of variables declaration                   
  
}

标签： javaswingjfreechart

解决方案

看起来您正在阻止事件调度线程。相反，请尝试使用此处显示的方法SwingWorker。如这里和这里所示，您的实现doInBackground()可以异步读取，在结果到达时发布。特别是，如此处所示，您可以doInBackground()在从ProcessBuilder. 如此处所示，您的实现process()可以安全地更新图表的数据模型。

顺便说一句，考虑这里显示的方法来驯服 GUI 编辑器。

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