Esempio n. 1
0
 public static void main(String[] arguments) {
   try {
     // read byte data into a byte buffer
     String data = "friends.dat";
     FileInputStream inData = new FileInputStream(data);
     FileChannel inChannel = inData.getChannel();
     long inSize = inChannel.size();
     ByteBuffer source = ByteBuffer.allocate((int) inSize);
     inChannel.read(source, 0);
     source.position(0);
     System.out.println("Original byte data:");
     for (int i = 0; source.remaining() > 0; i++) {
       System.out.print(source.get() + " ");
     }
     // convert byte data into character data
     source.position(0);
     Charset ascii = Charset.forName("US-ASCII");
     CharsetDecoder toAscii = ascii.newDecoder();
     CharBuffer destination = toAscii.decode(source);
     destination.position(0);
     System.out.println("\n\nNew character data:");
     for (int i = 0; destination.remaining() > 0; i++) {
       System.out.print(destination.get());
     }
     System.out.println();
   } catch (FileNotFoundException fne) {
     System.out.println(fne.getMessage());
   } catch (IOException ioe) {
     System.out.println(ioe.getMessage());
   }
 }
Esempio n. 2
0
 private void recv(SocketChannel sc, ClientInfo ci) throws IOException {
   ci.channel.read(ci.inBuf);
   ByteBuffer tmpBuf = ci.inBuf.duplicate();
   tmpBuf.flip();
   int bytesProcessed = 0;
   boolean doneLoop = false;
   while (!doneLoop) {
     byte b;
     try {
       b = tmpBuf.get();
     } catch (BufferUnderflowException bue) {
       // Processed all data in buffer
       ci.inBuf.clear();
       doneLoop = true;
       break;
     }
     switch (b) {
       case TypeServerConstants.WELCOME:
         bytesProcessed++;
         break;
       case TypeServerConstants.GET_STRING_REQUEST:
         bytesProcessed++;
         if (ci.outputPending) {
           // Client is backed up. We can't append to
           // the byte buffer because it's in the wrong
           // state. We could allocate another buffer
           // here and change our send method to know
           // about multiple buffers, but we'll just
           // assume that the client is dead
           break;
         }
         ci.outBuf.put(TypeServerConstants.GET_STRING_RESPONSE);
         ByteBuffer strBuf = encoder.encode(testString);
         ci.outBuf.putShort((short) strBuf.remaining());
         ci.outBuf.put(strBuf);
         ci.outBuf.flip();
         send(sc, ci);
         break;
       case TypeServerConstants.GET_STRING_RESPONSE:
         int startPos = tmpBuf.position();
         try {
           int nBytes = tmpBuf.getInt();
           byte[] buf = new byte[nBytes];
           tmpBuf.get(buf);
           bytesProcessed += buf.length + 5;
           String s = new String(buf);
           // Send the string to the GUI
           break;
         } catch (BufferUnderflowException bue) {
           // Processed all available data
           ci.inBuf.position(ci.inBuf.position() + bytesProcessed);
           doneLoop = true;
         }
         break;
     }
   }
 }
Esempio n. 3
0
 /*
  * Return a ByteBuffer with "remaining" space to work.  If you have to
  * reallocate the ByteBuffer, copy the existing info into the new buffer.
  */
 protected void resizeRequestBB(int remaining) {
   if (requestBB.remaining() < remaining) {
     // Expand buffer for large request
     ByteBuffer bb = ByteBuffer.allocate(requestBB.capacity() * 2);
     requestBB.flip();
     bb.put(requestBB);
     requestBB = bb;
   }
 }
Esempio n. 4
0
  private static WAVData readFromStream(AudioInputStream aIn)
      throws UnsupportedAudioFileException, IOException {
    ReadableByteChannel aChannel = Channels.newChannel(aIn);
    AudioFormat fmt = aIn.getFormat();
    int numChannels = fmt.getChannels();
    int bits = fmt.getSampleSizeInBits();
    int format = AL_FORMAT_MONO8;

    if ((bits == 8) && (numChannels == 1)) {
      format = AL_FORMAT_MONO8;
    } else if ((bits == 16) && (numChannels == 1)) {
      format = AL_FORMAT_MONO16;
    } else if ((bits == 8) && (numChannels == 2)) {
      format = AL_FORMAT_STEREO8;
    } else if ((bits == 16) && (numChannels == 2)) {
      format = AL_FORMAT_STEREO16;
    }

    int freq = Math.round(fmt.getSampleRate());
    int size = aIn.available();
    ByteBuffer buffer = ByteBuffer.allocateDirect(size);
    while (buffer.remaining() > 0) {
      aChannel.read(buffer);
    }
    buffer.rewind();

    // Must byte swap on big endian platforms
    // Thanks to swpalmer on javagaming.org forums for hint at fix
    if ((bits == 16) && (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN)) {
      int len = buffer.remaining();
      for (int i = 0; i < len; i += 2) {
        byte a = buffer.get(i);
        byte b = buffer.get(i + 1);
        buffer.put(i, b);
        buffer.put(i + 1, a);
      }
    }

    WAVData result = new WAVData(buffer, format, size, freq, false);
    aIn.close();

    return result;
  }
  public static void main(String args[]) throws Exception {
    final int ENOUGH_SIZE = 1024;
    final int SMALL_SIZE = 4;

    boolean isBlocked = true;
    int size = ENOUGH_SIZE;

    if (args.length > 0) {
      int opt = Integer.parseInt(args[0]);
      switch (opt) {
        case 1:
          isBlocked = true;
          size = ENOUGH_SIZE;
          break;
        case 2:
          isBlocked = true;
          size = SMALL_SIZE;
          break;
        case 3:
          isBlocked = false;
          size = ENOUGH_SIZE;
          break;
        case 4:
          isBlocked = false;
          size = SMALL_SIZE;
          break;
      }
    }

    DatagramChannel channel = DatagramChannel.open();
    channel.configureBlocking(isBlocked);
    ByteBuffer buffer = ByteBuffer.allocate(size);
    DatagramSocket socket = channel.socket();
    SocketAddress localAddr = new InetSocketAddress(8000);
    socket.bind(localAddr);

    while (true) {
      System.out.println("开始接收数据报");
      SocketAddress remoteAddr = channel.receive(buffer);
      if (remoteAddr == null) {
        System.out.println("没有接收到数据报");
      } else {
        buffer.flip();
        System.out.println("接收到的数据报的大小为" + buffer.remaining());
      }
      Thread.sleep(500);
    }
  }
  public static void main(String args[]) throws Exception {
    FileInputStream fin = new FileInputStream("readandshow.txt");
    FileChannel fc = fin.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(1024);

    fc.read(buffer);

    buffer.flip();

    int i = 0;
    while (buffer.remaining() > 0) {
      byte b = buffer.get();
      System.out.println("Character " + i + ": " + ((char) b));
      i++;
    }

    fin.close();
  }
Esempio n. 7
0
  private synchronized DBMessage go(DBMessage msg, ByteDecoder decoder) throws IOException {

    if (_sock == null) _open();

    {
      ByteBuffer out = msg.prepare();
      while (out.remaining() > 0) _sock.write(out);
    }

    if (_pool != null) _pool._everWorked = true;

    if (decoder == null) return null;

    ByteBuffer response = decoder._buf;

    if (response.position() != 0) throw new IllegalArgumentException();

    int read = 0;
    while (read < DBMessage.HEADER_LENGTH) read += _read(response);

    int len = response.getInt(0);
    if (len <= DBMessage.HEADER_LENGTH)
      throw new IllegalArgumentException("db sent invalid length: " + len);

    if (len > response.capacity())
      throw new IllegalArgumentException(
          "db message size is too big (" + len + ") " + "max is (" + response.capacity() + ")");

    response.limit(len);
    while (read < len) read += _read(response);

    if (read != len) throw new RuntimeException("something is wrong");

    response.flip();
    return new DBMessage(response);
  }
Esempio n. 8
0
 private int _read(ByteBuffer buf) throws IOException {
   int x = _in.read(buf.array(), buf.position(), buf.remaining());
   if (x < 0) throw new IOException("connection to server closed unexpectedly");
   buf.position(buf.position() + x);
   return x;
 }
 private void readMessage(SelectionKey sk, SocketChannel readChannel, TcpAddress incomingAddress)
     throws IOException {
   // note that socket has been used
   SocketEntry entry = (SocketEntry) sockets.get(incomingAddress);
   if (entry != null) {
     entry.used();
     ByteBuffer readBuffer = entry.getReadBuffer();
     if (readBuffer != null) {
       readChannel.read(readBuffer);
       if (readBuffer.hasRemaining()) {
         readChannel.register(selector, SelectionKey.OP_READ, entry);
       } else {
         dispatchMessage(incomingAddress, readBuffer, readBuffer.capacity());
       }
       return;
     }
   }
   ByteBuffer byteBuffer = ByteBuffer.wrap(buf);
   byteBuffer.limit(messageLengthDecoder.getMinHeaderLength());
   long bytesRead = readChannel.read(byteBuffer);
   if (logger.isDebugEnabled()) {
     logger.debug("Reading header " + bytesRead + " bytes from " + incomingAddress);
   }
   MessageLength messageLength = new MessageLength(0, Integer.MIN_VALUE);
   if (bytesRead == messageLengthDecoder.getMinHeaderLength()) {
     messageLength = messageLengthDecoder.getMessageLength(ByteBuffer.wrap(buf));
     if (logger.isDebugEnabled()) {
       logger.debug("Message length is " + messageLength);
     }
     if ((messageLength.getMessageLength() > getMaxInboundMessageSize())
         || (messageLength.getMessageLength() <= 0)) {
       logger.error(
           "Received message length "
               + messageLength
               + " is greater than inboundBufferSize "
               + getMaxInboundMessageSize());
       synchronized (entry) {
         entry.getSocket().close();
         logger.info("Socket to " + entry.getPeerAddress() + " closed due to an error");
       }
     } else {
       byteBuffer.limit(messageLength.getMessageLength());
       bytesRead += readChannel.read(byteBuffer);
       if (bytesRead == messageLength.getMessageLength()) {
         dispatchMessage(incomingAddress, byteBuffer, bytesRead);
       } else {
         byte[] message = new byte[byteBuffer.limit()];
         byteBuffer.flip();
         byteBuffer.get(message, 0, byteBuffer.limit() - byteBuffer.remaining());
         entry.setReadBuffer(ByteBuffer.wrap(message));
       }
       readChannel.register(selector, SelectionKey.OP_READ, entry);
     }
   } else if (bytesRead < 0) {
     logger.debug("Socket closed remotely");
     sk.cancel();
     readChannel.close();
     TransportStateEvent e =
         new TransportStateEvent(
             DefaultTcpTransportMapping.this,
             incomingAddress,
             TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
             null);
     fireConnectionStateChanged(e);
   }
 }