Java 二维码生成解析

怼烎@ 2024-03-22 20:32 26阅读 0赞

生成二维码需要两个jar包

![d7bb7e6b854e40a39531fe3cdf59d238.png][]

[Download core JAR 3.5.1 ➔ With all dependencies!][Download core JAR 3.5.1 _ With all dependencies]

[Download javase JAR 3.5.1 ➔ With all dependencies!][Download javase JAR 3.5.1 _ With all dependencies]

将下载后的jar包添加项目依赖

![05bc863f7a134e4b9ae4ba69dde4d39b.png][]

import com.google.zxing.*;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.QRCodeWriter;
    
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.util.HashMap;
    import java.util.Map;
    
    public class QrCodeDemo1 {
        public static void main(String[] args) {
            //支持中文
            Map<EncodeHintType, String> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.MARGIN, "1");
           //生成二维码
            int w = 220;
            int h = 220;
            //text可以直接写文字，二维码扫出即为文字，或者放视频或图片地址，则二维码扫出为图片或视频
            String text =
                    "http://img1.baidu.com/it/u=1828664006,303765003&fm=253&fmt=auto&app=138&f=JPEG? w=800&h=500";
            try {
                QRCodeWriter writer = new QRCodeWriter();
                BitMatrix encode = writer.encode(text, BarcodeFormat.QR_CODE, w, h, hints);
                BufferedImage img = MatrixToImageWriter.toBufferedImage(encode);
                //二维化格式new File("qr1.jpg")可选择图片地址，不写默认当前目录下
                ImageIO.write(img, "jpg", new File("qr1.jpg"));
            } catch (Exception e) {
            }
        }
    }

![f84e8946e90a483aa2034fb884306658.png][]

二维码图片平台会判违规

解析二维码

import com.google.zxing.*;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.common.HybridBinarizer;
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    
    public class QrCodeDemo2 {
        public static void main(String[] args) {
            try {
                //qr1.jpg刚生成的二维码图片
                BufferedImage i = ImageIO.read(new File("qr1.jpg"));
                LuminanceSource source = new BufferedImageLuminanceSource(i);
                BinaryBitmap image = new BinaryBitmap(new HybridBinarizer(source));
                Result result = new MultiFormatReader().decode(image);
                String info = result.getText();
                System.out.println(info);
                if (info == null || "".equals(info)) {
                    System.out.println("没有二维码信息");
                } else if (info.contains("weixin")) { //qq mp
                    System.out.println("有微信二维码，不允许");
                } else {
                    System.out.println("有二维，可以使用");
                }
            } catch (Exception e) {
                System.out.println("图像中没有二维码");
            }
           
        }
    }

可以判断图片中是否有二维码信息

![b87520319d664e89989a8a5e09fdb4b6.png][]

[d7bb7e6b854e40a39531fe3cdf59d238.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/b8ec488de29f4fa8bffc1a3ee0ea75d6.png
[Download core JAR 3.5.1 _ With all dependencies]: https://jar-download.com/artifacts/com.google.zxing/core/3.5.1/source-code
[Download javase JAR 3.5.1 _ With all dependencies]: https://jar-download.com/artifacts/com.google.zxing/javase/3.5.1/source-code
[05bc863f7a134e4b9ae4ba69dde4d39b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/b1c1a453c31f4313ad948df4352509cf.png
[f84e8946e90a483aa2034fb884306658.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/b1f3eac956714c7cb028af80f739645d.png
[b87520319d664e89989a8a5e09fdb4b6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/e573305433f04f4c8a915ed97776807e.png