Imprimir em impressora matricial

package util.impressao;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.JOptionPane;

/**
 * Classe que constroi um componente para impressao de impressora matricial
 *
 * @author Mauricio Lima
 *
 *         Data de Criacao: 13/05/2009
 *
 */

public class ImpressoraBean {

    // Codigos de controle da impressora
    public static final String CONDENSADO = "\u001B\u000F";
    public static final String NORMAL = "\u0012";
    public static final String ALINHAMENTO_VERTICAL_18 = "\u001B\u0030";
    public static final String NEW_LINE = "\n";
    public static final String CARRIAGE_RETURN = "\r";
    public static final String RESET = "\u001B" + "@";
    public static final String TAMANHO_DA_PAGINA = "\u001B" + "C" + (char) 33;
    public static final String TABELA_CARACTERES = "\u001B" + "t" + (char) 0;
    public static final String TABELA_CARACTERES_2 = "\u001B" + "(t" + (char) 3
            + (char) 0 + (char) 0 + (char) 25 + (char) 0;
    public static final String FORM_FEED = "\f";
    public static final String TAMANHO_10 = "\u001B" + "!" + (char) 0;
    public static final String TAMANHO_12 = "\u001B" + "M";
    public static final String TAMANHO_15 = "\u001B" + "g";
    public static final String TAMANHO_56 = "\u001B" + "!" + (char) 56;
    public static final String ALINHA_DIREITA = "\u001B" + "a" + (char) 0;
    public static final String ALINHA_ESQUERDA = "\u001B" + "a" + (char) 1;
    public static final String ALINHA_CENTRO = "\u001B" + "a" + (char) 2;
    public static final String ALINHA_TOTAL = "\u001B" + "a" + (char) 3;
    public static final String COLUNA_A = "\u001B" + "$" + (char) 1;
    public static final String COLUNA_B = "\u001B" + "$" + (char) 3;
    public static final String COLUNA_C = "\u001B" + "$" + (char) 5;
    public static final String COLUNA_D = "\u001B" + "$" + (char) 7;

    private StringBuffer buffer = null;
    private String impressora;

    public ImpressoraBean() {
        // use "/dev/lp0" no LINUX
        this.impressora = "LPT1:";
        buffer = new StringBuffer();
    }

    public ImpressoraBean(String impressora) {
        this.impressora = impressora;
        buffer = new StringBuffer();
    }

    public void insertLine() {
        String x = "-";
        for (int i = 0; i < 95; i++) {
            x += "-";
        }
        println(x);
    }

    /**
     * Escreve uma String e nao pula a linha
     *
     * @param s
     */
    public void print(String s) {
        buffer.append(s);
    }

    /**
     * Escreve uma String e pula uma linha
     *
     * @param s
     */
    public void println(String s) {
        buffer.append(s);
        println();
    }

    /**
     * Pula uma linha e posiciona no inicio
     */
    public void println() {
        buffer.append(NEW_LINE + CARRIAGE_RETURN);
    }

    /**
     * troca a folha da impressora
     */
    public void printff() {
        buffer.append(FORM_FEED);
    }

    /**
     * Manda para impressora
     *
     * @return retorna um booleano confirmando a impressao
     */
    public boolean flush() {

        FileOutputStream outputFile;
        try {
            outputFile = new FileOutputStream(impressora);
            PrintWriter out = new PrintWriter(outputFile);
            out.print(buffer.toString());
            out.close();
            outputFile.close();
            return true;
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null,
                    "Impressora ou arquivo nao encontrado!");
            System.out.println(e.getMessage());
            return false;

        }

    }

    @Override
    public String toString() {
        return buffer.toString();
    }
}