Java生成二维码、条形码

package com.nsk666.barcode;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Hashtable;

/**
 * 生成条形码，二维码工具类
 */
public class BarCodeUtil {

    // 其他调用方法
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); //0xFF000000 黑色 0xFFFFFFFF 白色
            }
        }
        return image;
    }


    /**
     * 生成条形码
     *
     * @param msg  条形码内容，只能是数字形式
     * @return 返回BufferedImage
     */
    public static BufferedImage generalBarCode(String msg, int width, int height) {
        Hashtable<EncodeHintType,String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            Code128Writer writer = new Code128Writer();
            // 编码内容, 编码类型, 宽度, 高度, 设置参数
            BitMatrix bitMatrix = writer.encode(msg, BarcodeFormat.CODE_128, width, height, hints);
            BufferedImage image = toBufferedImage(bitMatrix);
            return insertWords(image, msg);
        } catch (Exception e) {
            if (e instanceof IllegalArgumentException){
            }
        }
        return null;
    }


    /**
     * 二维码生成器
     *
     * @param text 二维码内容
     */
    public static BufferedImage generalQRCode(String text, int width) {
        Hashtable<EncodeHintType,String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, width, hints);
            // 去除白边
            return deleteWhite(bitMatrix);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }


    //去白边的话，调用这个方法
    private static BufferedImage deleteWhite(BitMatrix matrix) {
        int[] rec = matrix.getEnclosingRectangle();
        int resWidth = rec[2] + 1;
        int resHeight = rec[3] + 1;

        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
        resMatrix.clear();
        for (int i = 0; i < resWidth; i++) {
            for (int j = 0; j < resHeight; j++) {
                if (matrix.get(i + rec[0], j + rec[1])) {
                    resMatrix.set(i, j);
                }
            }
        }

        return toBufferedImage(resMatrix);
    }


    /**
     * 条形码下面加上文字
     *
     * @param image 条形码图片
     * @param words 文字
     * @return 返回BufferedImage
     * @author fxbin
     */
    public static BufferedImage insertWords(BufferedImage image, String words) {
        if (words != null && !words.isEmpty()) {
            int addHeight =20;
            BufferedImage outImage = new BufferedImage(image.getWidth(),image.getHeight()+addHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = outImage.createGraphics();
            // 抗锯齿
            setGraphics2D(g2d);
            // 设置白色
            setColorWhite(g2d);
            // 画条形码到新的面板
            g2d.drawImage(image, 0,0, image.getWidth(), image.getHeight(), null);
            // 画文字到新的面板
            Color color = new Color(0, 0, 0);
            g2d.setColor(color);
            // 字体、字型、字号
            g2d.setFont(new Font("微软雅黑", Font.PLAIN, 18));
            //文字长度
            int strWidth = g2d.getFontMetrics().stringWidth(words);
            //总长度减去文字长度的一半  （居中显示）
            int wordStartX = ( image.getWidth() - strWidth) / 2;
            //height + (outImage.getHeight() - height) / 2 + 12
            int wordStartY =  image.getHeight() +addHeight;

            // 画文字
            g2d.drawString(words, wordStartX, wordStartY);
            g2d.dispose();
            outImage.flush();
            return outImage;
        }
        return null;
    }

    /**
     * 设置 Graphics2D 属性  （抗锯齿）
     *
     * @param g2d Graphics2D提供对几何形状、坐标转换、颜色管理和文本布局更为复杂的控制
     */
    private static void setGraphics2D(Graphics2D g2d) {
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_DEFAULT);
        Stroke s = new BasicStroke(1, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER);
        g2d.setStroke(s);
    }

    /**
     * 设置背景为白色
     *
     * @param g2d Graphics2D提供对几何形状、坐标转换、颜色管理和文本布局更为复杂的控制
     */
    private static void setColorWhite(Graphics2D g2d) {
        g2d.setColor(Color.WHITE);
        //填充整个屏幕
        g2d.fillRect(0, 0, 600, 600);
        //设置笔刷
        g2d.setColor(Color.BLACK);
    }
}

package com.nsk666.barcode;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * @author niushuaikui
 * @description TODO
 * @date 2024/1/22
 */
public class BarCodeTest {
    public static void main(String[] args) throws IOException {
        BufferedImage image = new BufferedImage(200,200,BufferedImage.TYPE_BYTE_BINARY);

        Graphics2D mainPic = image.createGraphics();
        String code = String.valueOf(System.currentTimeMillis());
        System.out.println(code);
        // 生成条形码
        BufferedImage bimg = BarCodeUtil.generalQRCode(code,50);

        if (bimg != null) {
            mainPic.drawImage(bimg, 0, 0, 50, 50, null);
        }
        ImageIO.write(image,"png",new java.io.File("D:\\test\\qrcode.png"));
        // 生成条形码
        BufferedImage qrimg = BarCodeUtil.generalBarCode(code,150,50);

        if (qrimg != null) {
            mainPic.drawImage(qrimg, 0, 100, 200, 100, null);
        }
        ImageIO.write(image,"png",new java.io.File("D:\\test\\barcode.png"));
        mainPic.dispose();
    }
}