Processing the contents of the entire file - Java File Path IO

Java examples for File Path IO:Text File

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Description

Processing the contents of the entire file

Demo Code

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

public class Main {

  public static void main(String[] args) throws IOException {
    int bufferSize = 8;
    Path path = Paths.get("/home/docs/users.txt");
    final String newLine = System.getProperty("line.separator");
    try (SeekableByteChannel sbc = Files.newByteChannel(path, StandardOpenOption.WRITE)) {
      ByteBuffer buffer;//w w  w  . j av a 2s . co  m

      System.out.println("Contents of File");
      sbc.position(0);
      buffer = ByteBuffer.allocate(bufferSize);
      String encoding = System.getProperty("file.encoding");
      int numberOfBytesRead = sbc.read(buffer);
      System.out.println("Number of bytes read: " + numberOfBytesRead);
      while (numberOfBytesRead > 0) {
        buffer.rewind();
        System.out.print("[" + Charset.forName(encoding).decode(buffer) + "]");
        buffer.flip();
        numberOfBytesRead = sbc.read(buffer);
        System.out.println("\nNumber of bytes read: " + numberOfBytesRead);
      }
    }
  }
}

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