Using a Channel to Write a String to a File : FileChannel « File « Java Tutorial

1. Java Tutorial
2. File
3. FileChannel

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 MainClass {
  public static void main(String[] args) {
    String phrase = new String("text \n");
    String dirname = "C:/test"; 
    String filename = "charData.txt"; 
    File dir = new File(dirname); 
    File aFile = new File(dir, filename); 
    FileOutputStream outputFile = null; 
    try {
      outputFile = new FileOutputStream(aFile, true);
      System.out.println("File stream created successfully.");
    } catch (FileNotFoundException e) {
      e.printStackTrace(System.err);
    }
    FileChannel outChannel = outputFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println("New buffer:           position = " + buf.position() + "\tLimit = "
        + buf.limit() + "\tcapacity = " + buf.capacity());
    for (char ch : phrase.toCharArray()) {
      buf.putChar(ch);
    }
    System.out.println("Buffer after loading: position = " + buf.position() + "\tLimit = "
        + buf.limit() + "\tcapacity = " + buf.capacity());
    buf.flip(); 
    System.out.println("Buffer after flip:   position = " + buf.position() + "\tLimit = "
        + buf.limit() + "\tcapacity = " + buf.capacity());
    try {
      outChannel.write(buf);
      outputFile.close(); 
      System.out.println("Buffer contents written to file.");
    } catch (IOException e) {
      e.printStackTrace(System.err);
    }
  }
}