Source Code : Reading from a file using the AsynchronousFileChannel class

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Reading from a file using the AsynchronousFileChannel class

import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.EnumSet;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class Test {

  public static void main(String args[]) throws Exception {
    ExecutorService pool = new ScheduledThreadPoolExecutor(3);
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(
        Paths.get("data.txt"), EnumSet.of(StandardOpenOption.READ),
        pool);
    CompletionHandler<Integer, ByteBuffer> handler = new CompletionHandler<Integer, ByteBuffer>() {
      @Override
      public synchronized void completed(Integer result, ByteBuffer attachment) {
        for (int i = 0; i < attachment.limit(); i++) {
          System.out.println((char) attachment.get(i));
        }
      }
      @Override
      public void failed(Throwable e, ByteBuffer attachment) {
      }
    };
    final int bufferCount = 5;
    ByteBuffer buffers[] = new ByteBuffer[bufferCount];
    for (int i = 0; i < bufferCount; i++) {
      buffers[i] = ByteBuffer.allocate(10);
      fileChannel.read(buffers[i], i * 10, buffers[i], handler);
    }
    pool.awaitTermination(1, TimeUnit.SECONDS);
    for (ByteBuffer byteBuffer : buffers) {
      for (int i = 0; i < byteBuffer.limit(); i++) {
        System.out.print((char) byteBuffer.get(i));
      }
    }
  }
}

 

Thank with us