use FileChannel and ByteBuffer : ByteBuffer « File Input Output « Java

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Java » File Input Output » ByteBuffer

use FileChannel and ByteBuffer

 



import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;



public class Main {

  static public void main(String args[]) throws Exception {

    FileInputStream fin = new FileInputStream("infile.txt");

    FileOutputStream fout = new FileOutputStream("outfile.txt");



    FileChannel inc = fin.getChannel();

    FileChannel outc = fout.getChannel();



    ByteBuffer bb = ByteBuffer.allocate(1024);



    while (true) {

      int ret = inc.read(bb);

      if (ret == -1) 

        break;

      bb.flip();

      outc.write(bb);

      bb.clear(); 

    }

  }

}

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4.	Create a read-write memory-mapped file
5.	Create a private (copy-on-write) memory-mapped file.
6.	Fast Copy File
7.	A ByteBuffer is a fixed-capacity buffer that holds byte values.
8.	Create a ByteBuffer using a byte array
9.	Create a non-direct ByteBuffer with a 10 byte capacity
10.	Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.
11.	Get the ByteBuffer's capacity
12.	Use the absolute get().
13.	Set the position
14.	Use the relative get()
15.	Get remaining byte count in a ByteBuffer
16.	Set the limit for ByteBuffer
17.	This convenience method sets the position to 0
18.	Putting Bytes into a ByteBuffer
19.	Converting Between a ByteBuffer an a Byte Array
20.	Retrieve bytes between the position and limit
21.	Retrieve all bytes in the buffer
22.	Get and Set char type data in a ByteBuffer
23.	Get and Set short type data in a ByteBuffer
24.	Get and Set int type data in a ByteBuffer
25.	Get and Set long type data in a ByteBuffer
26.	Get and Set float type data in a ByteBuffer
27.	Get and Set double type data in a ByteBuffer
28.	Create a character ByteBuffer
29.	Create a short ByteBuffer
30.	Create an integer ByteBuffer
31.	Create a long ByteBuffer
32.	Create a float ByteBuffer
33.	Create a double ByteBuffer
34.	Get a substring
35.	Using a ByteBuffer to Store Strings
36.	Get default byte ordering
37.	Put a multibyte value
38.	Set to little endian
39.	Determining If a ByteBuffer Is Direct
40.	Reading from a Channel with a ByteBuffer
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

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