使用JBarcode生成一维码

需要的jar包，只有jbarcode.jar

链接: https://pan.baidu.com/s/1o9oDPB8 密码: x367

public class Main {

    //设置条形码高度
    private static final int BARCODE_HEIGHT = 40;
    //设置条形码默认分辨率
    private static final int BARCODE_DPI = ImageUtil.DEFAULT_DPI;
    //设置条形码字体样式
    private static final String FONT_FAMILY = "console";
    //设置条形码字体大小
    private static final int FONT_SIZE = 15;
    //设置条形码文本
    public static String TEXT = "";
    //创建jbarcode
    private static JBarcode jbc = null;    

    public static void main(String[] args) {
        List<String> list=new ArrayList<String>();
        list.add("KJ4.1-0127-0001");
        list.add("KJ4.1-0128-0001");
        list.add("KJ4.1-0129-0001");
        list.add("KJ4.1-0130-0001");
        if(list!=null && list.size()>0){
            for(String message:list){
                Main.createBarcode(message, new File("D:\\test\\"+message+".png"),"No");
            }
        }
    }

    public static JBarcode getJBarcode() throws InvalidAtributeException {
        /**
        * 参考设置样式：
        *barcode.setEncoder(Code128Encoder.getInstance()); //设置编码
        *barcode.setPainter(WidthCodedPainter.getInstance());// 设置Painter
        *barcode.setTextPainter(BaseLineTextPainter.getInstance()); //设置TextPainter
        *barcode.setBarHeight(17); //设置高度
        *barcode.setWideRatio(Double.valueOf(30).doubleValue());// 设置宽度比率
        *barcode.setXDimension(Double.valueOf(2).doubleValue()); // 设置尺寸，大小 密集程度
        *barcode.setShowText(true); //是否显示文本
         *barcode.setCheckDigit(true); //是否检查数字
        *barcode.setShowCheckDigit(false); //是否显示检查数字
       */
       if (jbc == null) {
           //生成code128
           jbc = JBarcodeFactory.getInstance().createCode128();
           jbc.setEncoder(Code128Encoder.getInstance());
           jbc.setTextPainter(CustomTextPainter.getInstance());
           jbc.setBarHeight(BARCODE_HEIGHT);
           jbc.setXDimension(Double.valueOf(0.8).doubleValue());
           jbc.setShowText(true);
       }
       return jbc;
       }    

       /**
        * @descript:生成条形码文件
        * @param message  条形码内容
        * @param file   生成文件
        */
       public static void createBarcode(String message, File file,String text) {
           try {
               FileOutputStream fos = new FileOutputStream(file);
               createBarcode(message, fos,text);
               fos.close();
           } catch (IOException e) {
               throw new RuntimeException(e);
           }
       }    

       /**
        * @descript:生成条形码并写入指定输出流
        * @param message   条形码内容
        * @param os   输出流
        */
       public static void createBarcode(String message, OutputStream os,String text) {
           try {
               //设置条形码文本
               TEXT=text;
               //创建条形码的BufferedImage图像
               BufferedImage image = getJBarcode().createBarcode(message);
               ImageUtil.encodeAndWrite(image, ImageUtil.PNG, os, BARCODE_DPI, BARCODE_DPI);
               os.flush();
           } catch (Exception e) {
               throw new RuntimeException(e);
           }
       }    

       /**
        * 静态内部类
        * 自定义的 TextPainter， 允许定义字体，大小，文本等
        * 参考底层实现：BaseLineTextPainter.getInstance()
        */
       protected static class CustomTextPainter implements TextPainter {
          private static CustomTextPainter instance =new CustomTextPainter();
          public static CustomTextPainter getInstance() {
               return instance;
          }
          public void paintText(BufferedImage barCodeImage, String text, int width) {
               //绘图
               Graphics g2d = barCodeImage.getGraphics();
               //创建字体
               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);
               //绘制文本
               g2d.drawString(TEXT, 0, 145);
               //绘制条形码
               g2d.drawString(text, center, barCodeImage.getHeight() - (height / 10) - 2);
           }
       }    

}

原文地址：https://www.cnblogs.com/yxth/p/8464930.html