package barcode;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.*;

import org.jbarcode.JBarcode;

import org.jbarcode.JBarcodeFactory;

import org.jbarcode.paint.TextPainter;

import org.jbarcode.util.ImageUtil;

public class BarcodeUtils {

private static final int BARCODE_HEIGHT = 12;

private static final int BARCODE_DPI = ImageUtil.DEFAULT_DPI;

private static final String FONT_FAMILY = "consola";

private static final int FONT_SIZE = 12;

private static JBarcode jbc = null;

static JBarcode getJBarcode() {

if (jbc == null) {

jbc = JBarcodeFactory.getInstance().createCode128();

jbc.setTextPainter(CustomTextPainter.getInstance());

jbc.setBarHeight(BARCODE_HEIGHT);

}

return jbc;

}

public static void createBarcode(String message, File file) {

try {

FileOutputStream fos = new FileOutputStream(file);

createBarcode(message, fos);

fos.close();

} catch (IOException e) {

throw new RuntimeException(e);

}

}

public static void createBarcode(String message, OutputStream os) {

try {

BufferedImage image = getJBarcode().createBarcode(message);

ImageUtil.encodeAndWrite(image, ImageUtil.PNG, os, BARCODE_DPI, BARCODE_DPI);

os.flush();

} catch (Exception e) {

throw new RuntimeException(e);

}

}

/**

* 自定义的 TextPainter， 允许定义字体，大小等等。

*/

static class CustomTextPainter implements TextPainter {

public static CustomTextPainter instance = new CustomTextPainter();

public static CustomTextPainter getInstance() {

return instance;

}

@Override

public void paintText(BufferedImage barCodeImage, String text, int width) {

Graphics g2d = barCodeImage.getGraphics();

Font font = new Font(FONT_FAMILY, Font.PLAIN, FONT_SIZE * width);

g2d.setFont(font);

FontMetrics fm = g2d.getFontMetrics();

int height = fm.getHeight();

int center = (barCodeImage.getWidth() - fm.stringWidth(text)) / 2;

g2d.setColor(Color.WHITE);

g2d.fillRect(0, 0, barCodeImage.getWidth(), barCodeImage.getHeight() * 1 / 20);

g2d.fillRect(0, barCodeImage.getHeight() - (height * 9 / 10), barCodeImage.getWidth(), (height * 9 / 10));

g2d.setColor(Color.BLACK);

g2d.drawString(text, center, barCodeImage.getHeight() - (height / 10) - 2);

}

}

public static void main(String[] args) {

BarcodeUtils.createBarcode("123456789012", new File("c:\\1.png"));

}

}