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我的代码应该捕获网络流量并将其显示在 textarea 上,但它没有这样做。请查看代码并检查是否有任何更正。

public class NewClass {

    public static JTextArea textarea = new JTextArea();

    NewClass() throws IOException{

        JButton capture = new JButton("Capture");
        JFrame frame = new JFrame();        
        JScrollPane scroll;
        NetworkInterface[] NI= JpcapCaptor.getDeviceList();
        int INDEX=0;
        JpcapCaptor JPCAP = JpcapCaptor.openDevice(NI[INDEX], 65536, false, 20);

        frame.setSize(700,500);
        frame.setLocation(200,200);
        frame.getContentPane().setLayout(null);
        frame.setBackground(Color.yellow);        

        textarea.setEditable(false);
        textarea.setFont(new Font("Tahoma",0,14));
        textarea.setForeground(Color.RED);
        textarea.setLineWrap(true);
        //textarea.setBackground(Color.WHITE);

        scroll = new JScrollPane();
        scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        scroll.setViewportView(textarea);

        frame.getContentPane().add(scroll);
        scroll.setBounds(10,16,740,290);

        capture.setBackground(Color.RED);
        capture.setForeground(Color.GREEN);
        frame.getContentPane().add(capture);

        handler ob = new handler();
        capture.addActionListener(ob);
        capture.setBounds(100, 400, 90, 25);

        frame.setVisible(true);
    }

    public class handler implements ActionListener{
        public void actionPerformed(ActionEvent Event){

            class Print implements PacketReceiver{
                public void receivePacket(Packet packet){
                    String info = packet.toString();
                    textarea.append(info);
                    //System.out.println(packet.toString());
                }                    
            }
    }
}
4

2 回答 2

2

我的代码应该捕获网络流量并将其显示在 textarea 上,但它没有这样做。请查看代码并检查是否有任何更正。

一方面,您的处理程序的 actionPerformed 方法实际上并没有做任何事情。它定义了一个内部类,但不创建此类的对象,也不对其进行任何操作:

public class handler implements ActionListener {
  public void actionPerformed(ActionEvent Event) {
     class Print implements PacketReceiver {
        public void receivePacket(Packet packet) {
           String info = packet.toString();
           textarea.append(info); // System.out.println(packet.toString());
        }
     }
  }
}

考虑创建一个 Print 类的对象(一个可怕的类名称,因为已经有一个 Print 类是核心 Java 库的一部分)并让这个 Print 对象做一些有用的事情,也许接收数据包(但是它应该这样做) )。请注意不要在主 Swing 线程(尽管 EDT)中执行长时间运行的进程,否则您将冻结您的 Swing GUI。

编辑
例如,

// note that class names such as "Handler" should begin with a capital letter.
public class Handler implements ActionListener {
  public void actionPerformed(ActionEvent Event) {
     class Print implements PacketReceiver {
        public void receivePacket(Packet packet) {
           String info = packet.toString();
           textarea.append(info); // System.out.println(packet.toString());
        }
     }

     // create a Print instance so that it can do something:
     final Print myPrint = new Print();

     // do something with myPrint here so that it gets packets and displays them
     // I suspect that you'll likely want to do this in a background thread
     // using a SwingWorker
  }
}
于 2012-08-04T15:08:35.747 回答
1

正如气垫船所说,除了定义一个内部类之外,您什么也不做。您在这里缺少的是从您的 JPCAP 类中对 processPacket() 或 loopPacket() 的调用。所以我建议如下:

public class handler implements ActionListener{
  public void actionPerformed(ActionEvent Event){

    class Print implements PacketReceiver{
        public void receivePacket(Packet packet){
            String info = packet.toString();
            textarea.append(info);                                            
        }

    }

    // this captures 10 packets .
    JPCAP.processPacket(10,new Print());
  }
}
于 2012-08-04T15:23:30.690 回答