InputStream is = DataParser.class.getClassLoader().getResourceAsStream("baidu_cdr.pcap"); Pcap pcap = PcapParser.unpack(is); is.close(); byte[] t = pcap.getData().get(0).getContent(); byte[] data = Arrays.copyOfRange(t, 42, t.length);

package com.hylanda.pcap; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; /**  * @author zhouqisheng  *  */ public class PcapParser {  public static Pcap unpack(InputStream is) throws IOException {   Pcap pcap = null;   byte[] buffer_4 = new byte[4];   byte[] buffer_2 = new byte[2];   pcap = new Pcap();   PcapHeader header = new PcapHeader();   int m = is.read(buffer_4);   if(m != 4){    return null;   }   reverseByteArray(buffer_4);   header.setMagic(byteArrayToInt(buffer_4, 0));   m = is.read(buffer_2);   reverseByteArray(buffer_2);   header.setMagor_version(byteArrayToShort(buffer_2, 0));   m = is.read(buffer_2);   reverseByteArray(buffer_2);   header.setMinor_version(byteArrayToShort(buffer_2, 0));   m = is.read(buffer_4);   reverseByteArray(buffer_4);   header.setTimezone(byteArrayToInt(buffer_4, 0));   m = is.read(buffer_4);   reverseByteArray(buffer_4);   header.setSigflags(byteArrayToInt(buffer_4, 0));   m = is.read(buffer_4);   reverseByteArray(buffer_4);   header.setSnaplen(byteArrayToInt(buffer_4, 0));   m = is.read(buffer_4);   reverseByteArray(buffer_4);   header.setLinktype(byteArrayToInt(buffer_4, 0));   pcap.setHeader(header);   List<PcapData> dataList = new ArrayList<PcapData>();   while (m > 0) {    PcapData data = new PcapData();    m = is.read(buffer_4);    if (m < 0) {     break;    }    reverseByteArray(buffer_4);    data.setTime_s(byteArrayToInt(buffer_4, 0));    m = is.read(buffer_4);    reverseByteArray(buffer_4);    data.setTime_ms(byteArrayToInt(buffer_4, 0));    m = is.read(buffer_4);    reverseByteArray(buffer_4);    data.setpLength(byteArrayToInt(buffer_4, 0));    m = is.read(buffer_4);    reverseByteArray(buffer_4);    data.setLength(byteArrayToInt(buffer_4, 0));    byte[] content = new byte[data.getpLength()];    m = is.read(content);    data.setContent(content);    dataList.add(data);   }   pcap.setData(dataList);   return pcap;  }  private static int byteArrayToInt(byte[] b, int offset) {   int value = 0;   for (int i = 0; i < 4; i++) {    int shift = (4 - 1 - i) * 8;    value += (b[i + offset] & 0x000000FF) << shift;   }   return value;  }  private static short byteArrayToShort(byte[] b, int offset) {   short value = 0;   for (int i = 0; i < 2; i++) {    int shift = (2 - 1 - i) * 8;    value += (b[i + offset] & 0x000000FF) << shift;   }   return value;  }  /**   * 反转数组   * @param arr   */  private static void reverseByteArray(byte[] arr){   byte temp;   int n = arr.length;   for(int i=0; i<n/2; i++){    temp = arr[i];    arr[i] = arr[n-1-i];    arr[n-1-i] = temp;   }  } }

/**  *  */ package com.hylanda.pcap; import java.util.List; /**  * @author zhouqisheng  *  */ public class Pcap {  private PcapHeader header;     private List<PcapData> data;  public PcapHeader getHeader() {   return header;  }  public void setHeader(PcapHeader header) {   this.header = header;  }  public List<PcapData> getData() {   return data;  }  public void setData(List<PcapData> data) {   this.data = data;  }     @Override     public String toString(){      StringBuilder s = new StringBuilder();      s.append("header{\n");      s.append(header.toString());      s.append("}\n");      s.append("data part count=").append(data.size());      return s.toString();     } }

package com.hylanda.pcap; /**  * @author zhouqisheng  *  数据包头  */ public class PcapData {  private int time_s;//时间戳（秒）  private int time_ms;//时间戳（微妙）  private int pLength;//抓包长度  private int length;//实际长度  private byte[] content;//数据  public int getTime_s() {   return time_s;  }  public void setTime_s(int time_s) {   this.time_s = time_s;  }  public int getTime_ms() {   return time_ms;  }  public void setTime_ms(int time_ms) {   this.time_ms = time_ms;  }  public int getpLength() {   return pLength;  }  public void setpLength(int pLength) {   this.pLength = pLength;  }  public int getLength() {   return length;  }  public void setLength(int length) {   this.length = length;  }  public byte[] getContent() {   return content;  }  public void setContent(byte[] content) {   this.content = content;  }  @Override  public String toString(){   StringBuilder s = new StringBuilder();   s.append("time_s=").append(this.time_s);   s.append("\ntime_ms=").append(this.time_ms);   s.append("\npLength=").append(this.pLength);   s.append("\nlength=").append(this.length);   return null;  } }

package com.hylanda.pcap; /**  * @author zhouqisheng  * pcap文件头  */ public class PcapHeader {  private int magic;//文件识别头,为0xA1B2C3D4  private short magor_version;//主要版本     private short minor_version;//次要版本     private int timezone;//当地标准时间     private int sigflags;//时间戳的精度     private int snaplen;//最大的存储长度     /**      * 0            BSD loopback devices, except for later OpenBSD   1            Ethernet, and Linux loopback devices   6            802.5 Token Ring   7            ARCnet   8            SLIP   9            PPP   10           FDDI   100         LLC/SNAP-encapsulated ATM   101         “raw IP”, with no link   102         BSD/OS SLIP   103         BSD/OS PPP   104         Cisco HDLC   105         802.11   108         later OpenBSD loopback devices (with the AF_value in network byte order)   113         special Linux “cooked” capture   114         LocalTalk      */     private int linktype;//链路类型  public int getMagic() {   return magic;  }  public void setMagic(int magic) {   this.magic = magic;  }  public short getMagor_version() {   return magor_version;  }  public void setMagor_version(short magor_version) {   this.magor_version = magor_version;  }  public short getMinor_version() {   return minor_version;  }  public void setMinor_version(short minor_version) {   this.minor_version = minor_version;  }  public int getTimezone() {   return timezone;  }  public void setTimezone(int timezone) {   this.timezone = timezone;  }  public int getSigflags() {   return sigflags;  }  public void setSigflags(int sigflags) {   this.sigflags = sigflags;  }  public int getSnaplen() {   return snaplen;  }  public void setSnaplen(int snaplen) {   this.snaplen = snaplen;  }  public int getLinktype() {   return linktype;  }  public void setLinktype(int linktype) {   this.linktype = linktype;  }  @Override     public String toString(){   StringBuilder s = new StringBuilder();   s.append("magic=").append("0x" + Integer.toHexString(this.magic));   s.append("\nmagor_version=").append(this.magor_version);   s.append("\nminor_version=").append(this.minor_version);   s.append("\ntimezone=").append(this.timezone);   s.append("\nsigflags=").append(this.sigflags);   s.append("\nsnaplen=").append(this.snaplen);   s.append("\nlinktype=").append(this.linktype);      return s.toString();     } }