java生成二维码视频

生成二维码可以使用第三方库，比如zxing。Java中可以使用zxing库来生成二维码，具体实现可以参考以下代码：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

public class QRCodeGenerator {

    public static void main(String[] args) throws WriterException, IOException {
        String text = "https://www.baidu.com/"; // 二维码内容
        int width = 300; // 二维码宽度
        int height = 300; // 二维码高度
        String format = "png"; // 二维码格式

        // 设置二维码参数
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

        // 生成二维码
        QRCodeWriter writer = new QRCodeWriter();
        BitMatrix matrix = writer.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        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);
            }
        }

        // 输出二维码图片
        File file = new File("qrcode.png");
        ImageIO.write(image, format, file);
    }
}