Write data to file

Hi All
Do you know how to write data to file as below format

first data is readable , second data is byte value

 for (int i = 192 ; i < 223 ; i++) {
  for ( int j = 129 ; i <= 223 , j++) {
    output to file i ,j ;
    output to byte of i , byte f j;
  }
}

I does not know how to update below file.

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

public class build_binary {
  public static void main(String[] args) {

    String phrase = new String(new byte [] {
      (byte) 0xe5, (byte) 0x87, (byte) 0x8c
    });
    File aFile = new File("test.txt");

    FileOutputStream file = null;
    try {
      file = new FileOutputStream(aFile, true);
    } catch (FileNotFoundException e) {
      e.printStackTrace(System.err);
    }
    FileChannel outChannel = file.getChannel();
     ByteBuffer buf = ByteBuffer.allocate(phrase.length());
       byte[] bytes = phrase.getBytes();
       buf.put(bytes);
    buf.flip();

    try {
      outChannel.write(buf);
      file.close();
    } catch (IOException e) {
      e.printStackTrace(System.err);
    }
  }
}