QR-Code二维码如何利用zxing库实现生成

<dependency>    <groupId>com.google.zxing</groupId>    <artifactId>javase</artifactId>    <version>3.3.0</version>  </dependency>

import java.io.File;  import java.io.IOException;  import java.util.HashMap;  import java.util.Map;    import com.google.zxing.BarcodeFormat;  import com.google.zxing.EncodeHintType;  import com.google.zxing.MultiFormatWriter;  import com.google.zxing.client.j2se.MatrixToImageWriter;  import com.google.zxing.common.BitMatrix;    /**   * 使用zxing库生成QRCode二维码样例程序   *   * @author 阿信sxq   *   */  public class QrcodeDemo {      public static void main(String[] args) {      new QrcodeDemo().genQrcode("https://my.oschina.net/songxinqiang");    }      public void genQrcode(String message) {      //输出目标文件      File file = new File("E:\qrcode.png");      if (!file.exists()) {        try {          file.mkdirs();          file.createNewFile();        } catch (IOException e) {}      }      //设置参数，输出文件      Map<EncodeHintType, String> hints = new HashMap<>();      hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");      try {        BitMatrix bitMatrix = new MultiFormatWriter().encode(message, BarcodeFormat.QR_CODE,            300, 300, hints);// 生成矩阵        MatrixToImageWriter.writeToPath(bitMatrix, "png", file.toPath());// 输出图像      } catch (Exception e) {}    }    }