根據固定路徑生成二維碼（copy 代碼直接可用）

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
 
import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
 / **
  *根據固定路徑生成二維碼
  * @author hxw
  *
  * /
public class WXEWCodeUtil {
    public static void main（String [] args）{
        //固定路徑
        String url =“http://www.baidu.com “;
        //二維碼存放路徑
        String path = FileSystemView.getFileSystemView（）。getHomeDirectory（）+ File.separator +“testQrcode”;
        String fileName =“temp.jpg”;
        createQrCode（url，path，fileName）;
    }
 
    公共靜態字符串createQrCode（字符串URL，字符串路徑，字符串文件名）{
        嘗試{
            地圖<EncodeHintType，字符串>提示=新的HashMap <>（）;
            hints.put（EncodeHintType.CHARACTER_SET，“UTF-8”）;

           //二維碼大小
            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）;
            }
        }
        返回的圖像;
    }
}