Jnetpcap公式インスタンス(4)-取得したパケットをファイルに書き込む

package org.jnetpcap.examples;  

import java.io.File;  
import java.nio.ByteBuffer;  
import java.util.ArrayList;  
import java.util.List;  

import org.jnetpcap.Pcap;  
import org.jnetpcap.PcapDumper;  
import org.jnetpcap.PcapHandler;  
import org.jnetpcap.PcapIf;  


public class PcapDumperExample {  
  public static void main(String[] args) {  
    List alldevs = new ArrayList(); 
    StringBuilder errbuf = new StringBuilder();    

    /*************************************************************************** 
     *       
     **************************************************************************/  
    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;  
    }  
    PcapIf device = alldevs.get(1); // We know we have atleast 1 device  

    /*************************************************************************** 
     *        
     **************************************************************************/  
    int snaplen = 64 * 1024;           // Capture all packets, no trucation  
    int flags = Pcap.MODE_PROMISCUOUS; // capture all packets  
    int timeout = 10 * 1000;           // 10 seconds in millis  
    Pcap pcap = Pcap.openLive(device.getName(), snaplen, flags, timeout, errbuf);  
    if (pcap == null) {  
      System.err.printf("Error while opening device for capture: %s
",   
        errbuf.toString());  
      return;  
    }  

    /*************************************************************************** 
     *      pcap   pcapdumper 
     ***************************************************************************/  
    String ofile = "tmp-capture-file.cap";  
    PcapDumper dumper = pcap.dumpOpen(ofile); // output file  

    /*************************************************************************** 
     *           handler    dumper           
     **************************************************************************/  
    PcapHandler dumpHandler = new PcapHandler() {  

      public void nextPacket(PcapDumper dumper, long seconds, int useconds,  
        int caplen, int len, ByteBuffer buffer) {  

        dumper.dump(seconds, useconds, caplen, len, buffer);  
      }  
    };  

    /*************************************************************************** 
     *   loop  10    ，           dumper
     **************************************************************************/  
    pcap.loop(10, dumpHandler, dumper);  

    File file = new File(ofile);  
    System.out.printf("%s file has %d bytes in it!
", ofile, file.length());  


    /*************************************************************************** 
     *   dumper handler     
     **************************************************************************/  
    dumper.close(); //   dumper   ，             
    pcap.close();  

    if (file.exists()) {  
      file.delete(); 
      //       ，         ，  wireshark            
    }  
  }  
}