Convert lines into the canonical format, that is, terminate lines with the CRLF sequence. : Escape Sequences « Data Type « Java Tutorial

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import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Convert lines into the canonical format, that is, terminate lines with the
 * CRLF sequence.
 * 
 * @author John Mani
 */
public class CRLFOutputStream extends FilterOutputStream {
  protected int lastb = -1;

  protected boolean atBOL = true; // at beginning of line?

  private static final byte[] newline = { (byte) '\r', (byte) '\n' };

  public CRLFOutputStream(OutputStream os) {
    super(os);
  }

  public void write(int b) throws IOException {
    if (b == '\r') {
      writeln();
    } else if (b == '\n') {
      if (lastb != '\r')
        writeln();
    } else {
      out.write(b);
      atBOL = false;
    }
    lastb = b;
  }

  public void write(byte b[]) throws IOException {
    write(b, 0, b.length);
  }

  public void write(byte b[], int off, int len) throws IOException {
    int start = off;

    len += off;
    for (int i = start; i < len; i++) {
      if (b[i] == '\r') {
        out.write(b, start, i - start);
        writeln();
        start = i + 1;
      } else if (b[i] == '\n') {
        if (lastb != '\r') {
          out.write(b, start, i - start);
          writeln();
        }
        start = i + 1;
      }
      lastb = b[i];
    }
    if ((len - start) > 0) {
      out.write(b, start, len - start);
      atBOL = false;
    }
  }

  /*
   * Just write out a new line, something similar to out.println()
   */
  public void writeln() throws IOException {
    out.write(newline);
    atBOL = true;
  }
}