import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;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.MultiFormatWriter;import com.google.zxing.common.BitMatrix;public class codeUtil { ???public static String createQrCode(String url, String path, String fileName) { ???????try { ???????????Map<EncodeHintType, String> hints = new HashMap<>(); ???????????hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); ???????????BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints); ???????????File file = new File(path, fileName); ???????????if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) { ???????????????writeToFile(bitMatrix, "jpg", file); ???????????????System.out.println("搞定：" + file); ???????????????return file.toString(); ???????????} ????????} catch (Exception e) { ???????????e.printStackTrace(); ???????} ???????return null; ???} ????static void writeToFile(BitMatrix matrix, String format, File file) throws IOException { ???????BufferedImage image = toBufferedImage(matrix); ???????if (!ImageIO.write(image, format, file)) { ???????????throw new IOException("Could not write an image of format " + format + " to " + file); ???????} ???} ????static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { ???????BufferedImage image = toBufferedImage(matrix); ???????if (!ImageIO.write(image, format, stream)) { ???????????throw new IOException("Could not write an image of format " + format); ???????} ???} ????private static final int BLACK = 0xFF000000; ???private static final int WHITE = 0xFFFFFFFF; ????private 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) ? BLACK : WHITE); ???????????} ???????} ???????return image; ???} ???public static void main(String[] args) { ???????createQrCode("www.baidu.com","D:\\","code.jpg"); ???}}pom文件依赖
<dependency>
???<groupId>com.google.zxing</groupId>
???<artifactId>core</artifactId>
???<version>3.1.0</version>
</dependency>
把url链接转换成二维码的工具类
原文地址：https://www.cnblogs.com/zyf-yxm/p/9037298.html