java生成二维码

最新推荐文章于 2025-07-15 15:04:26 发布

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#java生成二维码

本文详细介绍了如何使用Google ZXing库在Java环境下生成二维码。通过添加依赖并利用MatrixToImageWriter类，可以将任意文本内容转化为二维码图片，支持自定义图片尺寸及格式。

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添加依赖
<!--生成二维码 -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>

-----------------------------------------------------------------------------------------------



import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

/**
 * 二维码的生成需要借助MatrixToImageWriter类，该类是由Google提供的，可以将该类直接拷贝到源码中使用
 */
public class MatrixToImageWriter {
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;
    private static int width = 300; // 二维码图片宽度
    private static int height = 300; // 二维码图片高度
    private static String format = "png";// 二维码的图片格式

    private MatrixToImageWriter() throws WriterException {
    }

    public 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);
            }
        }
        return image;
    }
    
    //生成文件
    public 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);
        }
    }
    
    //生成字节流
    public static byte[] getQRCodeByteArr(String text) throws WriterException, IOException {
        Hashtable<EncodeHintType, String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    // 内容所使用字符集编码
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
        ByteArrayOutputStream imageByte = new ByteArrayOutputStream();
        ImageIO.write(image, format, imageByte);
        return imageByte.toByteArray();
    }



    
    public static void main(String[] args) throws Exception {
        String copyright = "@copyright cyw";
        String text = "你在干嘛"+copyright;
        Hashtable<EncodeHintType, String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    // 内容所使用字符集编码
        File file = new File("e://a.png");
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        MatrixToImageWriter.writeToFile(bitMatrix, format, file);

    }
}