Read file with FileChannel : FileChannel « File Input Output « Java






  1. Java
  2. File Input Output
  3. FileChannel

Read file with FileChannel

      

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class Util {
  public static final int BUFFER_SIZE = 4096;

  public void read(File src, OutputStream dest) {
    FileChannel channel = null;
    int bytesRead = -1;
    try {
      channel = new FileInputStream(src).getChannel();
      ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
      while ((bytesRead = channel.read(buffer)) != -1) {
        buffer.flip();
        dest.write(buffer.array(), 0, bytesRead);
        buffer.clear();
      }
    } catch (Exception e) {
      System.out.println(e);
    } finally {
      try {
        if (dest != null) {
          dest.flush();
          dest.close();
        }
        if (channel != null) {
          channel.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

}








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