生成二维码需要两个jar包

 Download core 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

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) {
        }
    }
}

 

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