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Samples of Pcap4J.
There is a newer version: 2.0.0-alpha.6
package org.pcap4j.sample;

import java.io.IOException;
import org.pcap4j.core.BpfProgram.BpfCompileMode;
import org.pcap4j.core.NotOpenException;
import org.pcap4j.core.PcapDumper;
import org.pcap4j.core.PcapHandle;
import org.pcap4j.core.PcapHandle.TimestampPrecision;
import org.pcap4j.core.PcapNativeException;
import org.pcap4j.core.PcapNetworkInterface;
import org.pcap4j.core.PcapNetworkInterface.PromiscuousMode;
import org.pcap4j.core.PcapPacket;
import org.pcap4j.util.NifSelector;

@SuppressWarnings("javadoc")
public class Dump {

  private static final String COUNT_KEY = Dump.class.getName() + ".count";
  private static final int COUNT = Integer.getInteger(COUNT_KEY, 5);

  private static final String READ_TIMEOUT_KEY = Dump.class.getName() + ".readTimeout";
  private static final int READ_TIMEOUT = Integer.getInteger(READ_TIMEOUT_KEY, 10); // [ms]

  private static final String SNAPLEN_KEY = Dump.class.getName() + ".snaplen";
  private static final int SNAPLEN = Integer.getInteger(SNAPLEN_KEY, 65536); // [bytes]

  private static final String TIMESTAMP_PRECISION_NANO_KEY =
      Dump.class.getName() + ".timestampPrecision.nano";
  private static final boolean TIMESTAMP_PRECISION_NANO =
      Boolean.getBoolean(TIMESTAMP_PRECISION_NANO_KEY);

  private static final String PCAP_FILE_KEY = Dump.class.getName() + ".pcapFile";
  private static final String PCAP_FILE = System.getProperty(PCAP_FILE_KEY, "Dump.pcap");

  private Dump() {}

  public static void main(String[] args) throws PcapNativeException, NotOpenException {
    String filter = args.length != 0 ? args[0] : "";

    System.out.println(COUNT_KEY + ": " + COUNT);
    System.out.println(READ_TIMEOUT_KEY + ": " + READ_TIMEOUT);
    System.out.println(SNAPLEN_KEY + ": " + SNAPLEN);
    System.out.println(TIMESTAMP_PRECISION_NANO_KEY + ": " + TIMESTAMP_PRECISION_NANO);
    System.out.println("\n");

    PcapNetworkInterface nif;
    try {
      nif = new NifSelector().selectNetworkInterface();
    } catch (IOException e) {
      e.printStackTrace();
      return;
    }

    if (nif == null) {
      return;
    }

    System.out.println(nif.getName() + "(" + nif.getDescription() + ")");

    PcapHandle.Builder phb =
        new PcapHandle.Builder(nif.getName())
            .snaplen(SNAPLEN)
            .promiscuousMode(PromiscuousMode.PROMISCUOUS)
            .timeoutMillis(READ_TIMEOUT);
    if (TIMESTAMP_PRECISION_NANO) {
      phb.timestampPrecision(TimestampPrecision.NANO);
    }
    PcapHandle handle = phb.build();

    handle.setFilter(filter, BpfCompileMode.OPTIMIZE);

    int num = 0;
    PcapDumper dumper = handle.dumpOpen(PCAP_FILE);
    while (true) {
      PcapPacket packet = handle.getNextPacket();
      if (packet == null) {
        continue;
      } else {
        dumper.dump(packet);
        num++;
        if (num >= COUNT) {
          break;
        }
      }
    }

    dumper.close();
    handle.close();
  }
}