jpcap监听网络 收发数据包java

/** * */ /** * @author macbook air * */ package my_jpcaptest; import java.io.UnsupportedEncodingException; import java.net.InetAddress; import jpcap.*; import jpcap.packet.EthernetPacket; import jpcap.packet.IPPacket; import jpcap.packet.UDPPacket; //import java.io.*; public class my_send { public static void main(String[] args) throws java.io.IOException{ NetworkInterface[] devices = JpcapCaptor.getDeviceList(); if(args.length<1){ System.out.println("Usage: java SentUDP <device index (e.g., 0, 1..)>"); for(int i=0;i<devices.length;i++) System.out.println(i+":"+devices[i].name+"("+devices[i].description+")"); //System.exit(0); //} //int index=Integer.parseInt(args[0]); JpcapSender sender=JpcapSender.openDevice(devices[2]); //System.out.println("ok"); UDPPacket p = new UDPPacket(8080,8088); p.setIPv4Parameter(0,false,false,false,0,false,false,false,0,1010101,100,IPPacket.IPPROTO_UDP,InetAddress.getLocalHost(),InetAddress.getLocalHost()); p.data="&*&&^$@^".getBytes(); System.out.println("ok"); EthernetPacket ether=new EthernetPacket(); ether.frametype=EthernetPacket.ETHERTYPE_IP; ether.src_mac=new byte[]{(byte)0,(byte)1,(byte)2,(byte)3,(byte)4,(byte)5}; ether.dst_mac=new byte[]{(byte)0,(byte)6,(byte)7,(byte)8,(byte)9,(byte)10}; p.datalink=ether; sender.sendPacket(p); String data = ""; for (int i = 0; i <p.data.length; i++) { data = Byte.toString(p.data[i]); int result=Integer.parseInt(data); char stchar = (char) result; //int result=Integer.parseInt(data)-48; System.out.println("方象�" + stchar);} } } }