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) {}
  }

}