java文件生成二维码代码

以下是Java文件生成二维码代码的示例：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

public class QRCodeGenerator {

    public static void main(String[] args) {
        String data = "https://www.example.com";
        String filePath = "qrcode.png";
        int size = 200;
        String fileType = "png";
        File qrFile = new File(filePath);
        createQRCode(data, size, fileType, qrFile);
        System.out.println("QR Code created successfully!");
    }

    private static void createQRCode(String data, int size, String fileType, File qrFile) {
        try {
            // Set QR code parameters
            Map<EncodeHintType, Object> hintMap = new HashMap<EncodeHintType, Object>();
            hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");

            // Create QR code
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix byteMatrix = qrCodeWriter.encode(data, BarcodeFormat.QR_CODE, size, size, hintMap);
            int width = byteMatrix.getWidth();
            BufferedImage image = new BufferedImage(width, width, BufferedImage.TYPE_INT_RGB);
            image.createGraphics();

            // Set QR code colors
            int white = 255 << 16 | 255 << 8 | 255;
            int black = 0;
            for (int i = 0; i < width; i++) {
                for (int j = 0; j < width; j++) {
                    image.setRGB(i, j, byteMatrix.get(i, j) ? black : white);
                }
            }

            // Write QR code to file
            ImageIO.write(image, fileType, qrFile);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

这段代码使用了Google的ZXing库来生成二维码。它创建了一个包含指定数据的二维码，并将其写入指定的文件中。您可以通过更改`data`，`size`，`fileType`和`qrFile`变量来生成不同的二维码。