Reading from a Channel with a ByteBuffer : ByteBuffer « File Input Output « Java






  1. Java
  2. File Input Output
  3. ByteBuffer

Reading from a Channel with a ByteBuffer

 

import java.io.FileInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;

public class Main {
  public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
      buf.rewind();

      numRead = channel.read(buf);

      buf.rewind();

      // Read bytes from ByteBuffer; see also
      for (int i = 0; i < numRead; i++) {
        byte b = buf.get();
      }
    }
  }
}








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6.use FileChannel and ByteBuffer
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8.A ByteBuffer is a fixed-capacity buffer that holds byte values.
9.Create a ByteBuffer using a byte array
10.Create a non-direct ByteBuffer with a 10 byte capacity
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12.Get the ByteBuffer's capacity
13.Use the absolute get().
14.Set the position
15.Use the relative get()
16.Get remaining byte count in a ByteBuffer
17.Set the limit for ByteBuffer
18.This convenience method sets the position to 0
19.Putting Bytes into a ByteBuffer
20.Converting Between a ByteBuffer an a Byte Array
21.Retrieve bytes between the position and limit
22.Retrieve all bytes in the buffer
23.Get and Set char type data in a ByteBuffer
24.Get and Set short type data in a ByteBuffer
25.Get and Set int type data in a ByteBuffer
26.Get and Set long type data in a ByteBuffer
27.Get and Set float type data in a ByteBuffer
28.Get and Set double type data in a ByteBuffer
29.Create a character ByteBuffer
30.Create a short ByteBuffer
31.Create an integer ByteBuffer
32.Create a long ByteBuffer
33.Create a float ByteBuffer
34.Create a double ByteBuffer
35.Get a substring
36.Using a ByteBuffer to Store Strings
37.Get default byte ordering
38.Put a multibyte value
39.Set to little endian
40.Determining If a ByteBuffer Is Direct
41.Writing and Appending a ByteBuffer to a File
42.Convert interchangeably between a ByteBuffer and a byte array
43.Create a ByteBuffer
44.Put bytes into a ByteBuffer
45.How to get bytes from a ByteBuffer
46.Write with ByteBuffer
47.Applying Regular Expressions on the Contents of a File