本文介绍了netbeans 7.1 IDE软件中Java程序中的网络嗅探器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
/*
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* and open the template in the editor.
*/
package netwrksim;
/**
*
* @author DEBASISH
*/
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, 0, 0, 2, 1, 2011));
dataset.addSeries(new float[0], 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], 65535,true, 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], 65535,true, 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, true, true, 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);
}
}
//程序无法正常工作！！！
//org.jfree.chart.ChartFrame中的错误
还有更多
//program is not working!!!!
// errors in org.jfree.chart.ChartFrame
and many more
推荐答案
public List<<b>Packet> packets;
这样，您很快就会发现自己尝试实例化某些对象而不是变量.
This way you will soon find out that you tried to instance some objects instead of variables.
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