創建二維碼工具類——Java

代碼

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

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

/**
 * @author Yawei Xi
 * @date 2018-7-9
 */
public class QrCodeUtil {

    /**
     * 創建二維碼圖片
     *
     * @param content    二維碼攜帶信息
     * @param qrCodeSize 二維碼圖片大小
     * @param filePath   生成的二維碼圖片的保存的路徑
     */
    public static void createQrCodeImage(String content, int qrCodeSize, String filePath) {
        try {
            BufferedImage bi = createQrCode(content, qrCodeSize);
            File imgFile = new File(filePath);
            ImageIO.write(bi, "JPEG", imgFile);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成包含字符串信息的二維碼圖片
     *
     * @param content    二維碼攜帶信息
     * @param qrCodeSize 二維碼圖片大小
     */
    private static BufferedImage createQrCode(String content, int qrCodeSize) {
        try {
            // 設置二維碼糾錯級別Map
            Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<>();
            // 矯錯級別
            hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            // 創建比特矩陣(位矩陣)的QR碼編碼的字符串
            BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
            // 使BufferedImage勾畫QRCode  (matrixWidth 是行二維碼像素點)
            int matrixWidth = byteMatrix.getWidth();
            int matrixHeight = byteMatrix.getWidth();
            BufferedImage image = new BufferedImage(matrixWidth - 65, matrixWidth - 65, BufferedImage.TYPE_INT_RGB);
            image.createGraphics();
            Graphics2D graphics = (Graphics2D) image.getGraphics();
            graphics.setColor(Color.WHITE);
            graphics.fillRect(0, 0, matrixWidth, matrixHeight);
            // 使用比特矩陣畫並保存圖像
            graphics.setColor(Color.BLACK);
            for (int i = 0; i < matrixWidth; i++) {
                for (int j = 0; j < matrixWidth; j++) {
                    if (byteMatrix.get(i, j)) {
                        graphics.fillRect(i - 33, j - 33, 2, 2);
                    }
                }
            }
            return image;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

測試用例

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/**
 * @author Yawei Xi
 * @since 2018-7-9 10:17
 */
public class Test {
    public static void main(String[] args) throws Exception {
        // 需要二維碼攜帶的內容
        String content = "All I need is someone who makes me wanna sing.";
        // 生成二維碼的大小
        int qrCodeSize = 900;
        // 將二維碼保存的路徑
        String filePath = "D:\\testQRImage.jpg";

        // 執行工具類，生成二維碼
        QrCodeUtil.createQrCodeImage(content, qrCodeSize, filePath);
    }
}

測試結果

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• 在指定路徑產生一個二維碼圖片，打開圖片，用手機掃碼后的結果如下：

All I need is someone who makes me wanna sing.