请教这个利用JPCAP抓包的按钮监听。程序已写完且抓包成功，但有两个小问题！

Question

tcpudp通讯

Answer 1

估计程序有点乱。我给大家注释以下，其实很短~startfca.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {/////以上是监听开始的代码，套路。
                try
                {
                    NetworkInterface[] devices=JpcapCaptor.getDeviceList();
                    JpcapCaptor pcatch=JpcapCaptor.openDevice(devices[0],65535,true,20);
                    pcatch.setFilter("ip",true);
                    Packet pfca;
                    IPPacket ipfca;
                    String typefca;///////////////以上都是变量声明
                    for(int i=0;i<devices.length;i++)
                    {
                        System.out.println(i+": "+devices[i].name+"("+devices[i].description+")");
                        System.out.println("Datalink: "+devices[i].datalink_name+"("+devices[i].datalink_description+")");
                    }/////////////////////////////以上是获取硬件信息。
                    while(true)
                    {
                        pfca=pcatch.getPacket();////////////这就是抓包的方法。
                        if(pfca!=null)/////////如果抓到包了，即不为NULL，则开始先转换它，然后再打印它。
                        {
                             ipfca=(IPPacket)pfca;
                             if(ipfca.protocol==6) typefca="TCP";
                             else if(ipfca.protocol==17) typefca="UDP";
                             else typefca="ELSE";
                             pacnum++;
                             model.addRow(new String[]{""+pacnum,"IPv"+ipfca.version,""+ipfca.src_ip,""+ipfca.dst_ip,typefca,""+ipfca.len});
                        }
                        if(pacnum%100==0) break;/////////每抓一百个就退出循环
                    }
                    pcatch.close();
                }
                catch(IOException ex)/////////////又是套路
                {
                    System.err.println(ex);
                }
            }
        });

Answer 2

这个没有研究过，看看下面几篇文章不知道有没有帮助。
http://www.4byte.cn/question/242894/inspect-outgoing-packets-and-delay-them-with-jpcap.html
http://www.4byte.cn/question/412767/get-list-of-unused-lan-ip-addresses.html
http://www.4byte.cn/question/557694/get-full-tcp-packet-data-using-jpcap.html