读取二维码

野性酷女 2022-05-15 04:16 143阅读 0赞

maven工程，先引入依赖。

在pom.xml中添加下面的语句

<dependency>
        <groupId>QRCode</groupId>
        <artifactId>QRCode</artifactId>
        <version>3.0</version>
    </dependency>

测试demo

package Test;  
          
        import java.awt.image.BufferedImage;  
        import java.io.File;  
        import java.io.IOException;  
          
        import javax.imageio.ImageIO;  
          
        import jp.sourceforge.qrcode.QRCodeDecoder;  
        import jp.sourceforge.qrcode.data.QRCodeImage;  
        import jp.sourceforge.qrcode.exception.DecodingFailedException;  
          
        public class ErWeiMaJieMa {  
            /**  
             * 解码二维码  
             * @param imgPath  
             * @return String  
             */    
            public String decoderQRCode(String imgPath) {    
            
                // QRCode 二维码图片的文件    
                File imageFile = new File(imgPath);    
            
                BufferedImage bufImg = null;    
                String decodedData = null;    
                try {    
                    bufImg = ImageIO.read(imageFile);    
            
                    QRCodeDecoder decoder = new QRCodeDecoder();    
                    decodedData = new String(decoder.decode(new J2SEImage(bufImg)));    
            
                    // try {    
                    // System.out.println(new String(decodedData.getBytes("gb2312"),    
                    // "gb2312"));    
                    // } catch (Exception e) {    
                    // // TODO: handle exception    
                    // }    
                } catch (IOException e) {    
                    System.out.println("Error: " + e.getMessage());    
                    e.printStackTrace();    
                } catch (DecodingFailedException dfe) {    
                    System.out.println("Error: " + dfe.getMessage());    
                    dfe.printStackTrace();    
                }    
                return decodedData;    
            }    
            
            /**  
             * @param args the command line arguments  
             */    
            public static void main(String[] args) {    
                ErWeiMaJieMa handler = new ErWeiMaJieMa();    
                String imgPath = "D:/EWM/ewm.png";    
                String decoderContent = handler.decoderQRCode(imgPath);    
                System.out.println("解析结果如下：");    
                System.out.println(decoderContent);    
                System.out.println("========decoder success!!!");    
            }    
            
            class J2SEImage implements QRCodeImage {    
                BufferedImage bufImg;    
            
                public J2SEImage(BufferedImage bufImg) {    
                    this.bufImg = bufImg;    
                }    
            
                public int getWidth() {    
                    return bufImg.getWidth();    
                }    
            
                public int getHeight() {    
                    return bufImg.getHeight();    
                }    
            
                public int getPixel(int x, int y) {    
                    return bufImg.getRGB(x, y);    
                }    
            
            }    
        }