所需要的​​jar​​包


core-3.1.0.jar


工具类​​QrCodeUtil.java​​

package erweima;
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) {
    //  要生成二维码的链接
    String url = "http://101.201.101.206:8081/ml/index.jsp";
    //  指定路径：D:\User\Desktop\testQrcode
    String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
    //  指定二维码图片名字
    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;
  }
}

然后就生成了，即插即用，小巧方便！

（Java）链接生成_jar包



作者：樊同学