调用jpcapCaptor.openDevice方法时，Java Swing应用程序冻结

问题描述

| 我正在使用jpcap开发一些带宽利用率监视工具。 我在做什么：- 1.我创建了一个单选按钮面板，其中包含系统上存在的所有网络接口的列表，用户必须选择其中一个。 2.一个jfreechart面板（动态），当用户单击GO！时，它将显示带宽利用率的实时图表。按钮。 问题：- 我在GO的ActionListener中添加了以下内容！纽扣

try{captor = JpcapCaptor.openDevice(devices[selecteddevice],65535,true,20);}catch(Exception e){}
timer.start();
    captor.loopPacket(-1,new PacketPrinter());

因此，当我运行程序GUI时，带有单选按钮面板和jfreechart面板，但是当我选择一个选项并按GO时！应用程序冻结，并且图表面板不显示任何动态更新。 当我注释掉JpcapCaptor.openDevice（devices [selecteddevice]，65535，true，20）时； 然后当我按GO！按钮，一切正常，例如计时器启动和图表面板正在更新。（但由于captor为null，因此它不捕获任何数据） 请帮我！！！  我的系统是ubuntu 10.04，jpcap 0.7 我的代码如下：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
import org.jfree.chart.ChartFrame;
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.DynamicTimeSeriesCollection;
import org.jfree.data.time.Second;
import org.jfree.data.xy.XYDataset;
import java.util.List;
import java.util.ArrayList;
import jpcap.*;
import jpcap.packet.*;
import java.util.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.*;

public class Sniffer extends JPanel
{
    private static jpcap.NetworkInterface[] devices;
    private static int selecteddevice=-1;
    JFrame frame;
    public static JpcapCaptor captor;
    private static final String TITLE=\"Bandwidth utilization Meter\";;
public static List<Packet> packets;
public static Timer timer;
   public static ArrayList<JRadioButton> radioButtonArray = new ArrayList<JRadioButton>();
private ButtonGroup group= new ButtonGroup();
    public static JButton  go;
    JFreeChart chart;
    static DynamicTimeSeriesCollection dataset;
    public Sniffer()
    {

         packets = new ArrayList<Packet>();
         dataset =new DynamicTimeSeriesCollection(1,120,new Second());
         dataset.setTimeBase(new Second(0,2,1,2011));
         dataset.addSeries(new float[0],\"PPP0 Bandwidth utilization Meter\");
         chart = createChart(dataset); 
         getDevices();

        timer = new Timer(1000,new ActionListener(){
            public void actionPerformed(ActionEvent e)

            {    long tlen=0;
                List<Packet> temp = new ArrayList<Packet>(packets);
                packets.clear();
                for(Packet i : temp)
                {
                    tlen+=i.len;
                }
                float[] newData = new float[1];
                newData[0]=(float)tlen/1024;
                dataset.advanceTime();
                dataset.appendData(newData);
                }});
         setGUI();



    }


    void setGUI()
    {
        setLayout(new BorderLayout());
        frame = new JFrame();
        JPanel panel = new JPanel(new GridLayout(devices.length,1));
        for (JRadioButton combo : radioButtonArray) 
        {
            panel.add(combo);
        }
        JScrollPane scrollPane = new JScrollPane(panel);
        go= new JButton(\"GO!\");
            go.addActionListener(new ActionListener()
                {
                    public void actionPerformed(ActionEvent ee)
                    {
   //problem starts here.............     
                        try{captor = JpcapCaptor.openDevice(devices[selecteddevice],20);}catch(Exception e){}
                        timer.start();
                        captor.loopPacket(-1,new PacketPrinter());
     //.....................................


                    }
            }
            );

            go.setEnabled(false);    

            panel.add(go);
            add(scrollPane,BorderLayout.CENTER);
            scrollPane.setSize(300,300);
            JFrame.setDefaultLookAndFeelDecorated(true);
            frame.setLayout(new GridLayout(2,0));
            frame.add(scrollPane);
            frame.add(new ChartPanel(chart));
            frame.setSize(1024,768);
          frame.setTitle(\"BW\");
          frame.setVisible(true);
          frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
    }

    public void getDevices()
    {
        devices = JpcapCaptor.getDeviceList();
        for(int i=0;i<devices.length;i++)
        {
            String device=null;
            radioButtonArray.add(new JRadioButton());
            group.add(radioButtonArray.get(i));
            radioButtonArray.get(i).addActionListener(new RadioButtonListener());
            device= devices[i].name+\" \"+\"(\"+devices[i].description+\")\";
            radioButtonArray.get(i).setText(device);
            }    
    }
    public static void startSniffing() throws Exception
    {
        captor = JpcapCaptor.openDevice(devices[selecteddevice],20);
    }
    public static void setSelectedDevice(int device) 
    {
        selecteddevice = device;
    }

    public NetworkInterface getSelectedDevice()
    {
        if (selecteddevice == -1) 
        {
            return null;
        } 
        else 
        {
            return devices[selecteddevice];
        }
    }
    public static void main(String args[])
    {
         Sniffer sniffer = new Sniffer();
         //sniffer.start();

    }
     private JFreeChart createChart(final XYDataset dataset) {
    final JFreeChart xyz = ChartFactory.createTimeSeriesChart(
        TITLE,\"Time(Seconds)\",\"Bandwidth KB/s\",dataset,false);
    final XYPlot plot = xyz.getXYPlot();
    ValueAxis domain = plot.getDomainAxis();
    domain.setAutoRange(true);
     ValueAxis range = plot.getRangeAxis();
    range.setRange(0,1000);
    return xyz;
}
}
 class RadioButtonListener extends JPanel implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        Sniffer.go.setEnabled(true);

        for (JRadioButton radio : Sniffer.radioButtonArray) {
            if (radio.isSelected()) {

                Sniffer.setSelectedDevice(Sniffer.radioButtonArray.indexOf(radio));

            }
        }
    }
}


class PacketPrinter implements PacketReceiver {
static long tlen;
public void receivePacket(Packet packet) {
  Sniffer.packets.add(packet);
  }
}

    

解决方法

        不要阻止EDT。将耗时的任务放在2中。