tftp 服务器

几个月前写的,今天改了一下,只有服务器端.
参考: tftp协议规范

TFtpServer.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389

/*  * 创建日期 2004-8-30-11:31:14  *  */ package starfire.tftp; import java.net.*; import java.io.*; import java.util.*; /**  * <a href="http://www.longen.org/S-Z/details-z/TFTPProtocol.htm">tftp 协议规范 </a>  *   * @author <a href="mailto:starfire@bit.edu.cn">starfire </a>  *    */ public class TFtpServer extends Thread {     public static final int DEFAULT_PORT = 69;     private HashMap map = new HashMap();     private File root;     private int port = DEFAULT_PORT;     private DatagramSocket ds;     private Timer timer = new Timer(true);     public TFtpServer() {         this(".");     }     public TFtpServer(String rootPath, int port) {         this(rootPath);         this.port = port;     }     public TFtpServer(String rootPath) {         this.root = new File(rootPath);         try {             this.root = this.root.getCanonicalFile();         } catch (IOException e) {             e.printStackTrace();         }     }     public void run() {         try {             ds = new DatagramSocket(new InetSocketAddress(port));         } catch (SocketException e) {             System.out.println("error when create datagram socket:"                     + e.getMessage());             return;         }         System.out.println("root path:" + root.getPath());         byte[] buf = new byte[516];         DatagramPacket packet = new DatagramPacket(buf, 516);         while (true) {             try {                 ds.receive(packet);                 System.out.println("recv packet:");                 TFtpPacketUtil.displayBytes(packet.getData());//                 process(packet);             } catch (IOException e1) {                 e1.printStackTrace();             }         }     }     protected void process(DatagramPacket packet) {         try {             byte[] buf = new byte[packet.getLength()];             System.arraycopy(packet.getData(), 0, buf, 0, buf.length);             TFtpPacket tfp = TFtpPacketUtil.decode(buf);             InetSocketAddress address = new InetSocketAddress(packet                     .getAddress(), packet.getPort());             String key = address.getHostName() + ":" + address.getPort();             System.out.println("key=" + key);             System.out.println("packet:" + tfp);             if (tfp.getOperateCode() == TFtpPacket.RRQ                     || tfp.getOperateCode() == TFtpPacket.WRQ) {                 Client client = new Client(address);                 boolean result = client.doAccept((RWPacket) tfp);                 if (result) {                     map.put(key, client);                 }             } else if (tfp.getOperateCode() == TFtpPacket.DATA) {                 Client client = (Client) map.get(key);                 if (client == null) {                     return;                 }                 boolean result = client.doProcess((DATAPacket) tfp);                 if (result) {                     map.remove(key);                     client.destroy();                 }             } else if (tfp.getOperateCode() == TFtpPacket.ACK) {                 Client client = (Client) map.get(key);                 if (client == null) {                     return;                 }                 boolean result = client.doProcess((ACKPacket) tfp);                 if (result) {                     map.remove(key);                     client.destroy();                 }             } else if (tfp.getOperateCode() == TFtpPacket.ERROR) {                 System.out.println(tfp);                 Client client = (Client) map.remove(key);                 client.destroy();             }         } catch (BadPacketFormatException e) {             e.printStackTrace();             System.out.println("recv unknown packet.");         }     }     protected void send(InetSocketAddress address, byte[] data) {         DatagramPacket packet = new DatagramPacket(data, data.length, address                 .getAddress(), address.getPort());         try {             ds.send(packet);             System.out.println("send packet:");             TFtpPacketUtil.displayBytes(data);         } catch (IOException e) {             e.printStackTrace();         }     }     class Client {         public static final int DEFAULT_DATA_SIZE = 512;         public static final int DEFAULT_TIME_OUT = 1000;         private InetSocketAddress address;         private String fileName;         private int block;         private boolean checked;//上次发送的包已收到回应         private RandomAccessFile raf;         private boolean accepted = false;         private byte[] buf = new byte[DEFAULT_DATA_SIZE];         private byte[] data;         private int times = 0;//每几次重发         private ResendTask task;         public Client(InetSocketAddress address) {             this.address = address;         }         public void destroy() {             if (task != null) {                 task.cancel();             }             if (raf != null) {                 try {                     raf.close();                 } catch (IOException e) {                     e.printStackTrace();                 }                 raf = null;             }         }         /**          * if accept,return true;else return false.          *           * @param packet          * @return          */         public boolean doAccept(RWPacket packet) {             this.fileName = packet.getFileName();             if (accepted) {                 return true;             }             if (packet.getOperateCode() == TFtpPacket.RRQ) {                 try {                     File file = new File(root, fileName);                     System.out.println(file.getPath() + " " + file.exists());                     raf = new RandomAccessFile(file, "r");                     data = new byte[DEFAULT_DATA_SIZE];                     int size = raf.read(data);                     DATAPacket dp = new DATAPacket();                     dp.setBlock(1);                     if (size != DEFAULT_DATA_SIZE) {                         byte[] buf = new byte[size];                         System.arraycopy(data, 0, buf, 0, size);                         data = buf;                     }                     dp.setData(data);                     data = TFtpPacketUtil.encode(dp);                     send(address, data);                     block = 1;                     task = new ResendTask(address, data);                     timer.schedule(task, DEFAULT_TIME_OUT);                 } catch (FileNotFoundException e) {                     System.out                             .println("file:" + e.getMessage() + " not found.");                     ERRORPacket ep = new ERRORPacket();                     ep.setErrorCode(ERRORPacket.FILE_NOT_FOUND_CODE);                     byte[] data = TFtpPacketUtil.encode(ep);                     send(address, data);                     return false;                 } catch (IOException e) {                     e.printStackTrace();                 }             } else {                 File file = new File(root, fileName);                 if (file.exists()) {                     ERRORPacket ep = new ERRORPacket();                     ep.setErrorCode(ERRORPacket.FILE_EXIST_CODE);                     ep.setErrorMessage("file:" + fileName + " has exist");                     byte[] data = TFtpPacketUtil.encode(ep);                     send(address, data);                     return false;                 }                 try {                     file.createNewFile();                     raf = new RandomAccessFile(file, "rwd");                 } catch (IOException e) {                     System.out.println("create file:" + fileName + " failed.");                     ERRORPacket ep = new ERRORPacket();                     ep.setErrorCode(ERRORPacket.NOT_DEFINED_CODE);                     byte[] data = TFtpPacketUtil.encode(ep);                     send(address, data);                     return false;                 }                 ACKPacket ap = new ACKPacket();                 ap.setBlock(0);                 data = TFtpPacketUtil.encode(ap);                 send(address, data);                 task = new ResendTask(address, data);                 timer.schedule(task, DEFAULT_TIME_OUT);             }             accepted = true;             return accepted;         }         /**          * if transfer end,return true,else return false.          *           * @param packet          * @return          */         public boolean doProcess(ACKPacket packet) {             if (task != null) {                 task.cancel();                 task = null;             }             if (packet.getBlock() == block) {                 try {                     if (raf == null                             || raf.length() <= block * DEFAULT_DATA_SIZE) {                         return true;                     }                     raf.seek(block * DEFAULT_DATA_SIZE);                     int size = raf.read(buf);                     data = buf;                     if (size < DEFAULT_DATA_SIZE) {                         data = new byte[size];                         System.arraycopy(buf, 0, data, 0, size);                         raf.close();                         raf = null;                     }                     DATAPacket dp = new DATAPacket();                     block++;                     dp.setBlock(block);                     dp.setData(data);                     data = TFtpPacketUtil.encode(dp);                     send(address, data);                     TFtpPacketUtil.displayBytes(data);                     task = new ResendTask(address, data);                     timer.schedule(task, DEFAULT_TIME_OUT);                 } catch (IOException e) {                     e.printStackTrace();                 }             }             return false;         }         /**          * if transfer end,return true,else return false.          *           * @param packet          * @return          */         public boolean doProcess(DATAPacket packet) {             if (task != null) {                 task.cancel();                 task = null;             }             byte[] data = packet.getData();             if (packet.getBlock() != block + 1) {                 return false;             }             block++;             ACKPacket ap = new ACKPacket();             ap.setBlock(block);             if (data != null) {                 try {                     raf.write(data);                 } catch (IOException e) {                     e.printStackTrace();                 }             }             if (data == null || data.length < DEFAULT_DATA_SIZE) {                 try {                     raf.close();                     raf = null;                 } catch (IOException e) {                     e.printStackTrace();                 }             }             data = TFtpPacketUtil.encode(ap);             send(address, data);             task = new ResendTask(address, data);             timer.schedule(task, DEFAULT_TIME_OUT);             return packet.getData() == null                     || packet.getData().length < DEFAULT_DATA_SIZE;         }     }     class ResendTask extends java.util.TimerTask {         private InetSocketAddress address;         private byte[] data;         private int times = 1;         public ResendTask(InetSocketAddress address, byte[] data) {             this.address = address;             this.data = data;         }                  public ResendTask(InetSocketAddress address, byte[] data,int times) {             this.address = address;             this.data = data;             this.times = times;         }         public void run() {             send(address, data);             if (times < 3) {//最多发3次                 timer.schedule(new ResendTask(address,data,times+1), (int) (Math.pow(2, times+1))                         * Client.DEFAULT_TIME_OUT);             }         }         public byte[] getData() {             return data;         }     }     public static void main(String[] args) {         new TFtpServer("e://").start();     }     /**      * @return      */     public File getRoot() {         return root;     }     /**      * @return      */     public int getPort() {         return port;     }     /**      * @param i      */     public void setPort(int i) {         port = i;     } }

TFtpPacketUtil.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282

/*  * 创建日期 2004-8-30-12:49:20  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public final class TFtpPacketUtil {      private TFtpPacketUtil() {        }   public static TFtpPacket decode(byte[] buf) throws BadPacketFormatException {     if (buf==null || buf.length<4) {       throw new BadPacketFormatException("packet too small");     }     int operateCode = buf[1];     if (operateCode<TFtpPacket.RRQ || operateCode>TFtpPacket.ERROR) {       throw new BadPacketFormatException("unknown operate code");     }     switch (operateCode) {       case TFtpPacket.RRQ:       case TFtpPacket.WRQ:         return decodeRWPacket(buf);       case TFtpPacket.DATA:         return decodeDATAPacket(buf);       case TFtpPacket.ACK:         return decodeACKPacket(buf);       case TFtpPacket.ERROR:         return decodeERRORPacket(buf);     }     return null;   }      /**    * 2 bytes       2 bytes string 1 byte    * -----------------------------------------    * | Opcode | ErrorCode | ErrMsg | 0 |    * -----------------------------------------    */   private static TFtpPacket decodeERRORPacket(byte[] buf) throws BadPacketFormatException {     if (buf.length<4) {       throw new BadPacketFormatException("ack packet must >= 4 bytes");     }     ERRORPacket packet = new ERRORPacket();     packet.setOperateCode(TFtpPacket.ERROR);     packet.setErrorCode(buf[2]<<8+buf[3]);     int end = 4;     int i = 4;     for (;i<buf.length;i++) {       if (buf[i]==0) {         end = i;         break;       }     }     if (i!=buf.length) {       String str = new String(buf,4,end-4);       packet.setErrorMessage(str);     }     return packet;   }   /**    * 2 bytes 2 bytes    * ---------------------    * | Opcode | Block # |    * ---------------------    * @param buf    * @return    */   private static TFtpPacket decodeACKPacket(byte[] buf) throws BadPacketFormatException {     displayBytes(buf);     if (buf.length<4) {       throw new BadPacketFormatException("ack packet must be 4 bytes");     }     ACKPacket packet = new ACKPacket();     packet.setOperateCode(TFtpPacket.ACK);     //System.out.println("buf[2]="+buf[2]+" buf[3]="+buf[3]+" total="+(buf[2]*256+buf[3]));     packet.setBlock(byte2int(buf[2])*256+byte2int(buf[3]));     //System.out.println("block:"+packet.getBlock());     return packet;   }   /**    * 2 bytes   2 bytes   n bytes    * ----------------------------------    * | Opcode | Block # | Data |    * ----------------------------------    * @param buf    * @return    */   private static TFtpPacket decodeDATAPacket(byte[] buf) throws BadPacketFormatException  {     if (buf.length<4) {       throw new BadPacketFormatException("bad data packet");     }     DATAPacket packet = new DATAPacket();     packet.setOperateCode(TFtpPacket.DATA);     packet.setBlock(byte2int(buf[2])*256+byte2int(buf[3]));     //System.out.println("decode data packet,block:"+packet.getBlock());     byte[] data = new byte[buf.length-4];     System.arraycopy(buf,4,data,0,data.length);     packet.setData(data);     return packet;   }      private static int byte2int(byte b) {     if ((b&0x80)!=0) {       return 128+(b&0x7f);     }     else {       return b;     }   }   /**    * RRQ,WRQ packet format    *  2 bytes    string   1 byte string 1 byte    *  ------------------------------------------------    *  | Opcode | Filename | 0 | Mode | 0 |    *  ------------------------------------------------    * @param buf    * @return    */   private static TFtpPacket decodeRWPacket(byte[] buf) throws BadPacketFormatException {     RWPacket packet = new RWPacket();     packet.setOperateCode((int)buf[1]);     int start = 2;     int end = 2;     int i;     for (i=start;i<buf.length;i++) {       if (buf[i]==0) {         end = i;         break;       }     }     if (i==buf.length) {       throw new BadPacketFormatException();     }     packet.setFileName(new String(buf,start,end-start));     start = end+1;     end = start;     for (i=start;i<buf.length;i++) {       if (buf[i]==0) {         end = i;         break;       }     }     if (i==buf.length) {       throw new BadPacketFormatException();     }     packet.setMode(new String(buf,start,end-start));     return packet;   }   public static byte[] encode(TFtpPacket packet) {     int operateCode = packet.getOperateCode();     switch (operateCode) {       case TFtpPacket.RRQ:       case TFtpPacket.WRQ:         return encodeRWPacket((RWPacket)packet);       case TFtpPacket.DATA:         return encodeDATAPacket((DATAPacket)packet);       case TFtpPacket.ACK:         return encodeACKPacket((ACKPacket)packet);       case TFtpPacket.ERROR:         return encodeERRORPacket((ERRORPacket)packet);            }     return null;   }   /**    * @param packet    * @return    */   private static byte[] encodeERRORPacket(ERRORPacket packet) {     byte[] messageBytes = null;     if (packet.getErrorMessage()!=null) {       messageBytes = packet.getErrorMessage().getBytes();     }     int size = messageBytes==null?0:messageBytes.length;     size += 2+2+1;     byte[] buf = new byte[size];     buf[1] = (byte)(TFtpPacket.ERROR&0xff);     int errorCode = packet.getErrorCode();     buf[2] = (byte)((errorCode>>8)&0xff);     buf[3] = (byte)(errorCode&0xff);     if (messageBytes!=null) {       System.arraycopy(messageBytes,0,buf,4,messageBytes.length);     }     return buf;   }   /**    * @param packet    * @return    */   private static byte[] encodeACKPacket(ACKPacket packet) {     byte[] buf = new byte[4];     buf[1] = (byte)(TFtpPacket.ACK&0xff);     int block = packet.getBlock();     buf[2] = (byte)((block>>8)&0xff);     buf[3] = (byte)(block&0xff);     return buf;   }   /**    * @param packet    * @return    */   private static byte[] encodeDATAPacket(DATAPacket packet) {     byte[] data = packet.getData();     int size = 2+2;     if (data!=null) {       size += data.length;     }     byte[] buf = new byte[size];     System.out.println("encode data packet,buf[0]="+Integer.toHexString(buf[0]));     buf[1] = (byte)(TFtpPacket.DATA&0xff);     int block = packet.getBlock();     buf[2] = (byte)((block>>8)&0xff);     buf[3] = (byte)(block&0xff);     if (data!=null) {       System.arraycopy(data,0,buf,4,data.length);     }     return buf;   }   /**    * @param packet    * @return    */   private static byte[] encodeRWPacket(RWPacket packet) {     int operateCode = packet.getOperateCode();     int size = 2;     String fileName = packet.getFileName();     String mode = packet.getMode();     byte[] nameBytes = fileName.getBytes();//fileName must not null     size += nameBytes.length+1;     byte[] modeBytes = null;     if (mode!=null) {       modeBytes = mode.getBytes();       size += modeBytes.length+1;     }     byte[] buf = new byte[size];     buf[1] = (byte)(operateCode&0xff);     System.arraycopy(nameBytes,0,buf,2,nameBytes.length);     if (modeBytes!=null) {       int pos = 2+nameBytes.length+1;       System.arraycopy(modeBytes,0,buf,pos,modeBytes.length);      }     return buf;   }      static int count = 0;      public static void displayBytes(byte[] buf) {     count++;     if (buf==null) {       System.out.println(count+":"+"null");       return ;     }     StringBuffer sb = new StringBuffer();     int len = buf.length>10?10:buf.length;     for (int i=0;i<len;i++) {       sb.append(Integer.toHexString(buf[i]));     }     System.out.println(count+":"+sb.toString());   }    }

TFtpPacket.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

/*  * 创建日期 2004-8-30-11:34:03  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public abstract class TFtpPacket {      public static final int UNKNOWN = 0;  //unknown   public static final int RRQ = 1;    //read request   public static final int WRQ = 2;    //write request   public static final int DATA = 3;  //data   public static final int ACK = 4;    //Acknowledgment   public static final int ERROR = 5;  //error      private int operateCode = UNKNOWN;      public int getOperateCode() {     return operateCode;   }   /**    * @param i    */   public void setOperateCode(int i) {     operateCode = i;   } }

BadPacketFormatException.java
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20	/*  * 创建日期 2004-8-30-11:54:24  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public class BadPacketFormatException extends Exception {      public BadPacketFormatException() {     super();   }      public BadPacketFormatException(String msg) {     super(msg);   } }

RWPacket.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

/*  * 创建日期 2004-8-30-11:51:16  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public class RWPacket extends TFtpPacket {   private String fileName;   private String mode;   public RWPacket() {        }   /**    * @return    */   public String getFileName() {     return fileName;   }   /**    * @return    */   public String getMode() {     return mode;   }   /**    * @param string    */   public void setFileName(String string) {     fileName = string;   }   /**    * @param string    */   public void setMode(String string) {     mode = string;   }      public String toString() {     return (getOperateCode()==TFtpPacket.RRQ?"read packet:":"write packet:")+"[fileName:="+       fileName+"][mode="+mode+"]";   } }

ERRORPacket.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

/*  * 创建日期 2004-8-30-13:07:55  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public class ERRORPacket extends TFtpPacket {      /**    * 错误码    * Value Meaning    * 0 未定义，请参阅错误信息（如果提示这种信息的话）    * 1 文件未找到    * 2 访问非法    * 3 磁盘满或超过分配的配额    * 4 非法的TFTP操作    * 5 未知的传输ID    * 6 文件已经存在    * 7 没有类似的用户    */   public static final int NOT_DEFINED_CODE = 0;   public static final int FILE_NOT_FOUND_CODE = 1;   public static final int ILLEGAL_ACCESS_CODE = 2;   public static final int DISK_FULL_CODE = 3;   public static final int ILLEGAL_OPERATE_CODE = 4;   public static final int UNKNOWN_ID_CODE = 5;   public static final int FILE_EXIST_CODE = 6;   public static final int USER_NOT_EXIST_CODE = 7;         private int errorCode;   private String errorMessage;      public ERRORPacket() {     setOperateCode(TFtpPacket.ERROR);   }   /**    * @return    */   public int getErrorCode() {     return errorCode;   }   /**    * @return    */   public String getErrorMessage() {     return errorMessage;   }   /**    * @param i    */   public void setErrorCode(int i) {     errorCode = i;   }   /**    * @param string    */   public void setErrorMessage(String string) {     errorMessage = string;   }   public String toString() {     return "Error packet:[errorCode="+errorCode+"][errorMessage="+errorMessage+"]";   } }

DATAPacket.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

/*  * 创建日期 2004-8-30-13:04:07  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public class DATAPacket extends TFtpPacket {   private int block;   private byte[] data;      public DATAPacket() {     setOperateCode(TFtpPacket.DATA);   }   /**    * @return    */   public int getBlock() {     return block;   }   /**    * @return    */   public byte[] getData() {     return data;   }   /**    * @param block    */   public void setBlock(int block) {     this.block = block;   }   /**    * @param data    */   public void setData(byte[] data) {     this.data = data;   }   public String toString() {     return "Data packet:[block="+block+"][data size="+(data==null?0:data.length)+"]";   } }

ACKPacket.java

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

/*  * 创建日期 2004-8-30-13:05:47  *  */ package starfire.tftp; /**  * @author <a href="mailto:starfire@bit.edu.cn">starfire</a>  *  */ public class ACKPacket extends TFtpPacket {   private int block;      public ACKPacket() {     setOperateCode(TFtpPacket.ACK);   }      /**    * @return    */   public int getBlock() {     return block;   }   /**    * @param i    */   public void setBlock(int i) {     block = i;   }      public String toString() {     return "Ack packet:[block="+block+"]";   } }