ZXING QR Coder

ZXING QR Coder

ZXING 生成和读取二维码

package com.example.java11boot.im;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

public class Ttest2 {

    public static void main(String[] args) {


    }


    public static void make() throws Exception {

        Map<EncodeHintType, String> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.MARGIN, "1");// 外边距

        int width = 200;
        int height = 200;
        String content = "Hello World By 中国";

        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        Path path = Paths.get("D:/hello.PNG");

        MatrixToImageWriter.writeToPath(bitMatrix,"PNG", path);
    }

    public static void read () throws Exception {

        QRCodeReader qrCodeReader = new QRCodeReader();
        BufferedImage bufferedImage = ImageIO.read(new File("D:/hello.PNG"));
        LuminanceSource luminanceSource = new BufferedImageLuminanceSource(bufferedImage);
        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));

        Map<DecodeHintType, String> hints2 = new HashMap<>();
        hints2.put(DecodeHintType.CHARACTER_SET, "UTF-8");

        Result result = qrCodeReader.decode(binaryBitmap, hints2);
        System.out.println(result.getText());
    }
}

=========================================================================================

@GetMapping("/")
    public void qr(HttpServletResponse httpServletResponse) throws Exception {
        Map<EncodeHintType, String> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.MARGIN, "1");// 外边距

        int width = 200;
        int height = 200;
        String content = "Hello World By 中国";

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

        ServletOutputStream outputStream = httpServletResponse.getOutputStream();

        MatrixToImageWriter.writeToStream(bitMatrix,"PNG", outputStream);
        outputStream.flush();
        outputStream.close();
    }

=========================================================================================


<dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.3</version>
        </dependency>

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.3</version>
        </dependency>