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NIO in Java

8/8/2014

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Below is the very basic example to use the NIO in Java & hope that it will help to kick start with NIO-

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class Filing {
 
 private FileChannel fc;
 private ByteBuffer bf;
 
 public static void main(String[] args) {
  new Filing().writing("Test.txt", "E:", "Hello World");
  new Filing().reading("Test.txt", "E:");
 }
 
 @SuppressWarnings("static-access")
 private void writing(String name, String path, String message){
  try {
   FileOutputStream fout = new FileOutputStream(path + "/" + name);
   fc = fout.getChannel();
   bf = ByteBuffer.allocate(1024);
   byte[] msg = message.getBytes();
   bf = bf.allocateDirect(1024);
   for (int i=0; i<msg.length; i++) {
    bf.put(msg[i]);
   }
   bf.flip();
   fc.write(bf);
   fc.close();
   fout.close();
   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
 
 public void reading(String name, String path){
  try {
   FileInputStream fit = new FileInputStream(path + "/" + name);
   fc = fit.getChannel();
   bf = ByteBuffer.allocate(1024);
   fc.read(bf);
   bf.flip();
   while(bf.position() < bf.limit())
   System.out.print((char)bf.get());
   fc.close();
   fit.close();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}

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