本文整理了Java中java.nio.Buffer.clear()方法的一些代码示例，展示了Buffer.clear()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Buffer.clear()方法的具体详情如下：
包路径：java.nio.Buffer
类名称：Buffer
方法名：clear

Buffer.clear介绍

[英]Clears this buffer.

While the content of this buffer is not changed, the following internal changes take place: the current position is reset back to the start of the buffer, the value of the buffer limit is made equal to the capacity and mark is cleared.
[中]清除此缓冲区。
当此缓冲区的内容未更改时，会发生以下内部更改：将当前位置重置回缓冲区的开始位置，使缓冲区限制值等于容量，并清除标记。

代码示例

代码示例来源：origin: stackoverflow.com

ByteBuffer b = new ByteBuffer(1024);
for(int i=0; i<N; i++) {
  b.clear();
  b.put(header[i]);
  b.put(data[i]);
  b.flip();
  out.write(b);
}

代码示例来源：origin: stackoverflow.com

public static long stream(InputStream input, OutputStream output) throws IOException {
  try (
    ReadableByteChannel inputChannel = Channels.newChannel(input);
    WritableByteChannel outputChannel = Channels.newChannel(output);
  ) {
    ByteBuffer buffer = ByteBuffer.allocateDirect(10240);
    long size = 0;

    while (inputChannel.read(buffer) != -1) {
      buffer.flip();
      size += outputChannel.write(buffer);
      buffer.clear();
    }

    return size;
  }
}

代码示例来源：origin: stackoverflow.com

ByteBuffer buffer = ByteBuffer.allocate(20);
buffer.clear();
test.putUnsignedByte(buffer, 255);
test.putUnsignedByte(buffer, 128);

代码示例来源：origin: stackoverflow.com

md = MessageDigest.getInstance("MD5");
FileChannel channel = inputStream.getChannel();
ByteBuffer buff = ByteBuffer.allocate(2048);
while(channel.read(buff) != -1)
  buff.flip();
  md.update(buff);
  buff.clear();

代码示例来源：origin: stackoverflow.com

ByteBuffer buffer = ByteBuffer.allocate(1024);
Selector selector = Selector.open();
      case OP_READ:
        client = (SocketChannel) key.channel();
        buffer.clear();
        if (client.read(buffer) != -1) {
          buffer.flip();
          String line = new String(buffer.array(), buffer.position(), buffer.remaining());
          System.out.println(line);

代码示例来源：origin: DV8FromTheWorld/JDA

private void ensureEncryptionBuffer(byte[] data)
{
  ((Buffer) encryptionBuffer).clear();
  int currentCapacity = encryptionBuffer.remaining();
  int requiredCapacity = AudioPacket.RTP_HEADER_BYTE_LENGTH + data.length;
  if (currentCapacity < requiredCapacity)
    encryptionBuffer = ByteBuffer.allocate(requiredCapacity);
}

代码示例来源：origin: stackoverflow.com

output = Channels.newChannel(externalContext.getResponseOutputStream());
for (ByteBuffer buffer = ByteBuffer.allocateDirect(10240); input.read(buffer) != -1; buffer.clear()) {
  output.write((ByteBuffer) buffer.flip());

代码示例来源：origin: glowroot/glowroot

@Override
  public void call(ByteBuffer buffer) {
    // this cast is needed in order to avoid
    // java.lang.NoSuchMethodError: java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer;
    // when this code is compiled with Java 9 and run with Java 8 or earlier
    ((Buffer) buffer).clear();
    histogram.encodeIntoByteBuffer(buffer);
    int size = buffer.position();
    // this cast is needed in order to avoid
    // java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer;
    // when this code is compiled with Java 9 and run with Java 8 or earlier
    ((Buffer) buffer).flip();
    builder.setEncodedBytes(ByteString.copyFrom(buffer, size));
  }
});

代码示例来源：origin: stackoverflow.com

class ReadWorker {
  private ByteBuffer buffer = ByteBuffer.allocate(4096);

  public void work() {
    fillBufferWithData();
    buffer.flip();
    doSomethingWithData();
    buffer.clear();
  }
}

代码示例来源：origin: stackoverflow.com

Charset utf8 = Charset.forName("UTF-8");
CharsetEncoder encoder = utf8.newEncoder();
char[] array = new char[1];
CharBuffer input = CharBuffer.wrap(array);
ByteBuffer output = ByteBuffer.allocate(10);
for (int reps = 0; reps < 10000; reps++) {
  for (array[0] = 0; array[0] < 10000; array[0]++) {
    output.clear();
    input.clear();
    encoder.encode(input, output, false);
    int len = output.position();
  }
}

代码示例来源：origin: stackoverflow.com

buffer.flip();
size += outputChannel.write(buffer);
buffer.clear();

代码示例来源：origin: eclipse/californium

/**
 * Gets the buffer's content.
 * <p>
 * The buffer will be cleared as part of this method, thus this method should
 * only be invoked once there are no more blocks to add.
 * 
 * @return The bytes contained in the buffer.
 */
public byte[] getBody() {
  ((Buffer)buf).flip();
  byte[] body = new byte[buf.remaining()];
  ((Buffer)buf.get(body)).clear();
  return body;
}

代码示例来源：origin: stackoverflow.com

private static ByteBuffer buffer = ByteBuffer.allocate(8);    

public static byte[] encodeDouble(double x) {
  buffer.clear();
  buffer.putDouble(0, x);
  return buffer.array();
}

public static double decodeDouble(byte[] bytes) {
  buffer.clear();
  buffer.put(bytes);
  buffer.flip(); 
  return buffer.getDouble();
}

代码示例来源：origin: DV8FromTheWorld/JDA

public ByteBuffer asEncryptedPacket(ByteBuffer buffer, byte[] secretKey, byte[] nonce, int nlen)
{
  //Xsalsa20's Nonce is 24 bytes long, however RTP (and consequently Discord)'s nonce is a different length
  // so we need to create a 24 byte array, and copy the nonce into it.
  // we will leave the extra bytes as nulls. (Java sets non-populated bytes as 0).
  byte[] extendedNonce = nonce;
  if (nonce == null)
    extendedNonce = getNoncePadded();
  //Create our SecretBox encoder with the secretKey provided by Discord.
  TweetNaclFast.SecretBox boxer = new TweetNaclFast.SecretBox(secretKey);
  byte[] encryptedAudio = boxer.box(encodedAudio, extendedNonce);
  ((Buffer) buffer).clear();
  int capacity = RTP_HEADER_BYTE_LENGTH + encryptedAudio.length + nlen;
  if (capacity > buffer.remaining())
    buffer = ByteBuffer.allocate(capacity);
  populateBuffer(seq, timestamp, ssrc, encryptedAudio, buffer);
  if (nonce != null)
    buffer.put(nonce, 0, nlen);
  return buffer;
}

代码示例来源：origin: stackoverflow.com

int bufsize = 8192;
   ByteBuffer buffer = ByteBuffer.allocateDirect(bufsize); 
   byte[] temp = new byte[bufsize];
   int b = channel.read(buffer);
   while (b > 0) {
     buffer.flip();
     buffer.get(temp, 0, b);
     md.update(temp, 0, b);
     buffer.clear();
     b = channel.read(buffer);
   }

代码示例来源：origin: stackoverflow.com

int readCount = 0;
int BUFFER_SIZE = 256;
StringBuilder sb = new StringBuilder();
CharBuffer cBuffer = CharBuffer.allocate(BUFFER_SIZE);
Reader reader = new InputStreamReader(is, StandardCharsets.UTF_8);
while(reader.read(cBuffer) > 0 && readCount < 68) {
  cBuffer.flip();
  sb.append(cBuffer);
  cBuffer.clear();
  readCount++;
}

代码示例来源：origin: stackoverflow.com

private long stream(InputStream input, OutputStream output) throws IOException {

  try (ReadableByteChannel inputChannel = Channels.newChannel(input); WritableByteChannel outputChannel = Channels.newChannel(output)) {
    ByteBuffer buffer = ByteBuffer.allocate(10240);
    long size = 0;

    while (inputChannel.read(buffer) != -1) {
      buffer.flip();
      size += outputChannel.write(buffer);
      buffer.clear();
    }
    return size;
  }
}

代码示例来源：origin: stackoverflow.com

ByteBuffer buf = ByteBuffer.allocate(100); 
while(!stopped)
{
  // do something
  buf.clear();
}

代码示例来源：origin: stackoverflow.com

// Create a direct buffer to get bytes from socket.
// Direct buffers should be long-lived and be reused as much as possible.
ByteBuffer buf = ByteBuffer.allocateDirect(1024);

try {
  // Clear the buffer and read bytes from socket
  buf.clear();
  int numBytesRead = socketChannel.read(buf);

  if (numBytesRead == -1) {
    // No more bytes can be read from the channel
    socketChannel.close();
  } else {
    // To read the bytes, flip the buffer
    buf.flip();

    // Read the bytes from the buffer ...;
    // see Getting Bytes from a ByteBuffer
  }
} catch (IOException e) {
  // Connection may have been closed
}

代码示例来源：origin: stackoverflow.com

public static void readUtf8(URLConnection connection, Appendable out)
  throws IOException {
 CharBuffer buffer = CharBuffer.allocate(1024);
 try (InputStream in = connection.getInputStream();
 Reader reader = new InputStreamReader(in, StandardCharsets.UTF_8)) {
  while (reader.read(buffer) != -1) {
   buffer.flip();
   out.append(buffer);
   buffer.clear();
  }
 }
}