【代码】Java生成二维码

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前言

Java生成二维码

源代码

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import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.Base64Utils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;

/**
 * 二维码工具类
 */
//@Component
public class QrCodeUtils {

    // 制定二维码宽度
    private static int weight = 400;

    // 制定二维码高度
    private static int height = 400;

    // 制定转换的格式
    private static String format = "png";

    /**
     * 生成二维码并base64转码（默认参数）
     *
     * @param content 二维码内容
     * @return 二维码图片经base64转码后的结果
     */
    public static String encodeWithBase64(String content) {
        return "data:image/" + format + ";base64," + encodeWithBase64(content, weight, height, format);
    }

    /**
     * 生成二维码并base64转码
     */
    public static String encodeWithBase64(String content, int width, int height, String format) {
        BufferedImage bufferedImage = encodeOfImg(content, width, height, format);

        try {
            // 转为字节数组
            byte[] imageByteArray = IOUtils.toByteArray(bufferedImageToInputStream(bufferedImage, format));

            // base64转码
            return Base64Utils.encodeToString(imageByteArray);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成二维码并保存文件
     */
    public static void encodeAndSave(String content, int width, int height, String format, String path) {
        // 生成二维码位图
        BitMatrix bitMatrix = encode(content, width, height, format);

        try {
            MatrixToImageWriter.writeToPath(bitMatrix, format, new File(path).toPath());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成二维码位图
     */
    private static BitMatrix encode(String content, int width, int height, String format) {
        HashMap hints = new HashMap();
        //编码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //容错等级
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        //边框
        hints.put(EncodeHintType.MARGIN, 2);
        try {

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

            return bitMatrix;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成二维码图片对象
     */
    private static BufferedImage encodeOfImg(String content, int width, int height, String format) {
        try {
            // 生成二维码位图
            BitMatrix bitMatrix = encode(content, width, height, format);

            // 转为图片
            BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix,
                    new MatrixToImageConfig(Color.BLACK.getRGB(), Color.WHITE.getRGB()));

            return bufferedImage;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    private static InputStream bufferedImageToInputStream(BufferedImage image, String format) {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ImageIO.write(image, format, os);
            InputStream input = new ByteArrayInputStream(os.toByteArray());
            return input;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

完成