我的控制台输出是——
Exception in thread "main" java.lang.IllegalArgumentException: size of array must be MAX_ID_COUNT size
at org.jnetpcap.packet.JScanner.loadScanners(Native Method)
at org.jnetpcap.packet.JScanner.reloadAll(JScanner.java:376)
at org.jnetpcap.packet.JScanner.<init>(JScanner.java:313)
at org.jnetpcap.packet.JScanner.<init>(JScanner.java:293)
at org.jnetpcap.packet.JPacket.getDefaultScanner(JPacket.java:621)
at org.jnetpcap.packet.JPacket.scan(JPacket.java:1094)
at org.jnetpcap.packet.JMemoryPacket.<init>(JMemoryPacket.java:387)
at org.jnetpcap.packet.JMemoryPacket.<init>(JMemoryPacket.java:440)
at ClassicPcapExample.main(ClassicPcapExample.java:128)
代码：
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.jnetpcap.Pcap;
import org.jnetpcap.PcapIf;
import org.jnetpcap.packet.JMemoryPacket;
import org.jnetpcap.packet.JPacket;
import org.jnetpcap.packet.PcapPacket;
import org.jnetpcap.packet.PcapPacketHandler;
import org.jnetpcap.protocol.JProtocol;
import org.jnetpcap.protocol.lan.Ethernet;
import org.jnetpcap.protocol.network.Ip4;
import org.jnetpcap.protocol.tcpip.Tcp;
public class ClassicPcapExample{
/**
* Main startup method
*
* @param args
* ignored
*/
public static void main(String[] args) {
List<PcapIf> alldevs = new ArrayList<PcapIf>(); // Will be filled with NICs
StringBuilder errbuf = new StringBuilder(); // For any error msgs
/***************************************************************************
* First get a list of devices on this system
**************************************************************************/
int r = Pcap.findAllDevs(alldevs, errbuf);
if (r == Pcap.NOT_OK || alldevs.isEmpty()) {
System.err.printf("Can't read list of devices, error is %s", errbuf
.toString());
return;
}
System.out.println("Network devices found:");
int i = 0;
for (PcapIf device : alldevs) {
String description =
(device.getDescription() != null) ? device.getDescription()
: "No description available";
System.out.printf("#%d: %s [%s]\n", i++, device.getName(), description);
}
PcapIf device = alldevs.get(0); // We know we have atleast 1 device
System.out
.printf("\nChoosing '%s' on your behalf:\n",
(device.getDescription() != null) ? device.getDescription()
: device.getName());
/***************************************************************************
* Second we open up the selected device
**************************************************************************/
int snaplen = 64 * 1024; // Capture all packets, no truncation
int flags = Pcap.MODE_PROMISCUOUS; // capture all packets
int timeout = 10 * 1000; // 10 seconds in milliseconds
Pcap pcap =
Pcap.openLive(device.getName(), snaplen, flags, timeout, errbuf);
if (pcap == null) {
System.err.printf("Error while opening device for capture: "
+ errbuf.toString());
return;
}
/***************************************************************************
* Third we create a packet handler which will receive packets from the
* libpcap loop.
**************************************************************************/
PcapPacketHandler<String> jpacketHandler = new PcapPacketHandler<String>() {
public void nextPacket(PcapPacket packet, String user) {
System.out.printf("Received packet at %s caplen=%-4d len=%-4d %s\n",
new Date(packet.getCaptureHeader().timestampInMillis()),
packet.getCaptureHeader().caplen(), // Length actually captured
packet.getCaptureHeader().wirelen(), // Original length
user // User supplied object
);
}
};
/***************************************************************************
* Fourth we enter the loop and tell it to capture 10 packets. The loop
* method does a mapping of pcap.datalink() DLT value to JProtocol ID, which
* is needed by JScanner. The scanner scans the packet buffer and decodes
* the headers. The mapping is done automatically, although a variation on
* the loop method exists that allows the programmer to specify exactly
* which protocol ID to use as the data link type for this pcap interface.
**************************************************************************/
//pcap.loop(5, jpacketHandler, "jNetPcap rocks!");//GETTING AN ERROR AT THIS LINE!!
pcap.close();
}
}