工具类：生成二维码

你的名字 2024-03-22 15:31 62阅读 0赞

### 生成二维码 ###

#### 依赖 ####

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

#### 代码 ####

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.nio.file.Path;
    
    import javax.imageio.ImageIO;
    
    import org.springframework.stereotype.Component;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    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.decoder.ErrorCorrectionLevel;
    
    @Component
    public class QRCodeUtils {
        
    
        public void createQRCode(String filePath, String content) {
        
            int width = 300;            //图片的宽度
            int height = 300;            //图片的高度
            String format = "png";        //图片的格式
    //        String content="风间影月";     //内容
    
            /**
             * 定义二维码的参数
             */
            HashMap hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    //指定字符编码为“utf-8”
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);  //指定二维码的纠错等级为中级
            hints.put(EncodeHintType.MARGIN, 2);    //设置图片的边距
    
            /**
             * 生成二维码
             */
            try {
        
                BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
                Path file = new File(filePath).toPath();
                MatrixToImageWriter.writeToPath(bitMatrix, format, file);
            } catch (Exception e) {
        
                e.printStackTrace();
            }
        }
    
        public String getContentFromQRCode(String filePath) {
        
            MultiFormatReader formatReader = new MultiFormatReader();
            File file = new File(filePath);
            BufferedImage image;
            try {
        
                image = ImageIO.read(file);
                BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer
                        (new BufferedImageLuminanceSource(image)));
                HashMap hints = new HashMap();
                hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    //指定字符编码为“utf-8”
                Result result = formatReader.decode(binaryBitmap, hints);
                return result.toString();
            } catch (Exception e) {
        
                e.printStackTrace();
                return null;
            }
        }
    }