Java使用QRcode生成二维码

1、添加依赖

<!--google生成二维码依赖-->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

2、创建工具类

/**
 * 二维码生成工具类
 * @author Cloud
 * @data   2022-10-13
 * QRCode
 */
public class QRCodeUtil {

    //二维码颜色
    private static final int BLACK = 0xFF000000;
    //二维码颜色
    private static final int WHITE = 0xFFFFFFFF;

    /**
     * ZXing 方式生成二维码
     *
     * @param text       二维码内容
     * @param width      二维码宽
     * @param height     二维码高
     * @param outPutPath 二维码生成保存路径
     * @param imageType  二维码生成格式
     */
    public static void zxingCodeCreate(String text, int width, int height, String outPutPath, String imageType) throws UnsupportedEncodingException {
        Map<EncodeHintType, String> his = new HashMap<EncodeHintType, String>();
        //设置编码字符集
        his.put(EncodeHintType.CHARACTER_SET, "utf-8");
        text = new String(text.getBytes("UTF-8"),"UTF-8");
        try {
            //1、生成二维码
            BitMatrix encode = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height,his);
            //2、获取二维码宽高
            int codeWidth = encode.getWidth();
            int codeHeight = encode.getHeight();
            //3、将二维码放入缓冲流
            BufferedImage image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB);
            for (int i = 0; i < codeWidth; i++) {
                for (int j = 0; j < codeHeight; j++) {
                    //4、循环将二维码内容定入图片
                    image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE);
                }
            }
            File outPutImage = new File(outPutPath);
            //如果图片不存在创建图片
            if (!outPutImage.exists())
                outPutImage.createNewFile();
            //5、将二维码写入图片
            ImageIO.write(image, imageType, outPutImage);
        } catch (WriterException e) {
            e.printStackTrace();
            System.out.println("二维码生成失败");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("生成二维码图片失败");
        }
    }
}

3、编写测试类

/**
 * @author zzw
 * @description TODO
 * @date 2022-10-13
 */
public class Test{
    @Test
    public void test(){
        // QRcode 二维码生成测试
        QRCodeUtil.zxingCodeCreate("我使用Java生成了二维码",300, 300, "E:/borths.jpg", "jpg");
    }
}

4、生成二维码测试

5、效果展示