package llj.mf.utils;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.imageio.ImageIO;import javax.swing.filechooser.FileSystemView;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix;public class QrCodeUtil {	public static void main(String[] args) {		String url = "http://baidu.com";		String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";		String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + ".jpg";		createQrCode(url, path, fileName);	}	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);			}		} 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;	}}