求助JAVA用zxing生成二维码怎么编写的时候没有问题，但是却在硬盘里面找不到目标二维码

[B0OO]

看了好久的视频
一步步跟着做下来的
package qrcode;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.util.HashMap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class qrcode {

public static void main(String[] args) throws IOException {
int width=300;
int height=300;
String format="png";
String content="www.imooc.com";
HashMap hints=new HashMap();
hints.put(EncodeHintType.CHARACTER_SET,"utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.M);
hints.put(EncodeHintType.MARGIN,2);
try {

BitMatrix bitMatrix=new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height,hints);

Path file=new File("D:/code/img.png").toPath();

MatrixToImageWriter.writeToPath(bitMatrix, format, file);
} catch (WriterException e) {

e.printStackTrace();
}
}
}