【java实现二维码的生成(源码)】

Bertha 。 2023-10-01 19:51 80阅读 0赞

**目录**

【复制即用】实现通过扫描生成的二维码跳转到指定网页，也可实现扫描二维码显示文本或图片

1.0.导入依赖坐标

1.1.工具类

1.2.入参类

1.3.controller层

1.4.service层

1.5.业务逻辑处理层

1.6 测试示例

### 【复制即用】实现通过扫描生成的二维码跳转到指定网页，也可实现扫描二维码显示文本或图片 ###

#### 1.0.导入依赖坐标 ####

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>

**1.1.1导入谷歌提供的帮助类(前置)**

import com.google.zxing.LuminanceSource;
    import java.awt.Graphics2D;
    import java.awt.geom.AffineTransform;
    import java.awt.image.BufferedImage;
    
    /**
     * 二维码生成解析帮助(二维码图片缓存)类
     *
     * @Author 周兆宇
     * @Date 2022-01-21 14:17:01
     */
    public class BufferedImageLuminanceSource extends LuminanceSource {
    
        private final BufferedImage image;
        private final int left;
        private final int top;
    
        public BufferedImageLuminanceSource(BufferedImage image) {
            this(image, 0, 0, image.getWidth(), image.getHeight());
        }
    
        public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
            super(width, height);
    
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            if (left + width > sourceWidth || top + height > sourceHeight) {
                throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
            }
    
            for (int y = top; y < top + height; y++) {
                for (int x = left; x < left + width; x++) {
                    if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                        // = white
                        image.setRGB(x, y, 0xFFFFFFFF);
                    }
                }
            }
    
            this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
            this.image.getGraphics().drawImage(image, 0, 0, null);
            this.left = left;
            this.top = top;
        }
    
    
        @Override
        public byte[] getRow(int y, byte[] row) {
            if (y < 0 || y >= getHeight()) {
                throw new IllegalArgumentException("Requested row is outside the image: " + y);
            }
            int width = getWidth();
            if (row == null || row.length < width) {
                row = new byte[width];
            }
            image.getRaster().getDataElements(left, top + y, width, 1, row);
            return row;
        }
    
        @Override
        public byte[] getMatrix() {
            int width = getWidth();
            int height = getHeight();
            int area = width * height;
            byte[] matrix = new byte[area];
            image.getRaster().getDataElements(left, top, width, height, matrix);
            return matrix;
        }
    
        @Override
        public boolean isCropSupported() {
            return true;
        }
    
        @Override
        public LuminanceSource crop(int left, int top, int width, int height) {
            return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
        }
    
        @Override
        public boolean isRotateSupported() {
            return true;
        }
    
        @Override
        public LuminanceSource rotateCounterClockwise() {
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
            BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
            Graphics2D g = rotatedImage.createGraphics();
            g.drawImage(image, transform, null);
            g.dispose();
            int width = getWidth();
            return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
        }
    
    }

#### 1.1.工具类 ####

import com.google.zxing.BarcodeFormat;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.DecodeHintType;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    import java.awt.BasicStroke;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.Shape;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.OutputStream;
    import java.util.Hashtable;
    import javax.imageio.ImageIO;
    
    /**
     * 二维码生成解析工具类
     *
     * @Author 周兆宇
     * @Date 2022-01-21 14:17:01
     */
    public class QrCodeUtil {
    
        private static final String CHARSET = "utf-8";
        private static final String FORMAT_NAME = "JPG";
        // 二维码尺寸
        private static final int QRCODE_SIZE = 300;
        // LOGO宽度
        private static final int WIDTH = 60;
        // LOGO高度
        private static final int HEIGHT = 60;
    
        private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                    hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
            if (imgPath == null || "".equals(imgPath)) {
                return image;
            }
            // 插入图片
            QrCodeUtil.insertImage(image, imgPath, needCompress);
            return image;
        }
    
        private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
            File file = new File(imgPath);
            if (!file.exists()) {
                System.err.println("" + imgPath + "   该文件不存在！");
                return;
            }
            Image src = ImageIO.read(new File(imgPath));
            int width = src.getWidth(null);
            int height = src.getHeight(null);
            // 压缩LOGO
            if (needCompress) {
                if (width > WIDTH) {
                    width = WIDTH;
                }
                if (height > HEIGHT) {
                    height = HEIGHT;
                }
                Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
                BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                Graphics g = tag.getGraphics();
                // 绘制缩小后的图
                g.drawImage(image, 0, 0, null);
                g.dispose();
                src = image;
            }
            // 插入LOGO
            Graphics2D graph = source.createGraphics();
            int x = (QRCODE_SIZE - width) / 2;
            int y = (QRCODE_SIZE - height) / 2;
            graph.drawImage(src, x, y, width, height, null);
            Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
            graph.setStroke(new BasicStroke(3f));
            graph.draw(shape);
            graph.dispose();
        }
    
        public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
            BufferedImage image = QrCodeUtil.createImage(content, imgPath, needCompress);
            mkdirs(destPath);
            ImageIO.write(image, FORMAT_NAME, new File(destPath));
        }
    
        public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
            BufferedImage image = QrCodeUtil.createImage(content, imgPath, needCompress);
            return image;
        }
    
        public static void mkdirs(String destPath) {
            File file = new File(destPath);
            // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
            if (!file.exists() && !file.isDirectory()) {
                file.mkdirs();
            }
        }
    
        public static void encode(String content, String imgPath, String destPath) throws Exception {
            QrCodeUtil.encode(content, imgPath, destPath, false);
        }
    
        public static void encode(String content, String destPath) throws Exception {
            QrCodeUtil.encode(content, null, destPath, false);
        }
    
        public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
                throws Exception {
            BufferedImage image = QrCodeUtil.createImage(content, imgPath, needCompress);
            ImageIO.write(image, FORMAT_NAME, output);
        }
    
        public static void encode(String content, OutputStream output) throws Exception {
            QrCodeUtil.encode(content, null, output, false);
        }
    
        public static String decode(File file) throws Exception {
            BufferedImage image;
            image = ImageIO.read(file);
            if (image == null) {
                return null;
            }
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Result result;
            Hashtable hints = new Hashtable();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
            result = new MultiFormatReader().decode(bitmap, hints);
            String resultStr = result.getText();
            return resultStr;
        }
    
        public static String decode(String path) throws Exception {
            return QrCodeUtil.decode(new File(path));
        }
    
    }

#### 1.2.入参类 ####

import io.swagger.annotations.ApiModel;
    import io.swagger.annotations.ApiModelProperty;
    import java.io.Serializable;
    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    /**
     * @Description: 生成二维码入参类
     * @Author: 周兆宇
     * @Date: 2022-01-24 16:57:08
     */
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder
    @Data
    @ApiModel("生成二维码入参类")
    public class QrCodeReq implements Serializable {
    
        private static final long serialVersionUID = -3535741618235811221L;
    
        @ApiModelProperty("存放在二维码中的内容(全地址路径)")
        private String text;
    
        @ApiModelProperty("生成的二维码的路径及名称")
        private String destPath;
    }

#### 1.3.controller层 ####

import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiOperation;
    import javax.annotation.Resource;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @Description: 二维码生成解析控制层
     * @Author: 周兆宇
     * @Date: 2022-01-24 17:01:22
     */
    @RestController
    @Slf4j
    @Api(tags = "二维码生成解析API")
    @RequestMapping("/qrCode")
    public class QrCodeController {
    
        @Resource
        private QrCodeFacade qrCodeService;
    
        @ApiOperation(value = "二维码生成与解析")
        @PostMapping("/buildQrCode")
        public Result buildQrCode(@RequestBody QrCodeReq qrCodeReq) {
            return qrCodeService.buildQrCode(qrCodeReq);
        }
    
    }

#### 1.4.service层 ####

/**
     * @Description: 二维码生成解析服务接口
     * @Author: 周兆宇
     * @Date: 2022-01-24 17:04:14
     */
    public interface QrCodeFacade {
    
        /**
         * 功能描述: 二维码生成并解析
         *
         * @param qrCodeReq
         * @return com.dianliantech.common.model.Result
         * @author 周兆宇
         * @date 2022-01-24 17:12:44
         */
        Result buildQrCode(QrCodeReq qrCodeReq);
    }

#### 1.5.业务逻辑处理层 ####

import lombok.extern.slf4j.Slf4j;
    import org.springframework.stereotype.Component;
    
    /**
     * @Description: 二维码生成解析逻辑处理层
     * @Author: 周兆宇
     * @Date: 2022-01-24 17:34:05
     */
    @Component
    @Slf4j
    public class QrCommand {
    
        /**
         * 功能描述: 生成和解析二维码
         *
         * @param qrCodeReq
         * @return Result
         * @author 周兆宇
         * @date 2022-01-24 17:42:24
         */
        public Result buildQrCode(QrCodeReq qrCodeReq) {
            try {
                // 生成二维码        二维码内容    嵌入二维码的图片路径;  图片存储路径;    是否将嵌入二维码的图片进行压缩
                QrCodeUtil.encode(qrCodeReq.getText(), null, qrCodeReq.getDestPath(),
                        false);
                // 解析二维码(传入要解析的二维码地址即可)
                QrCodeUtil.decode(qrCodeReq.getDestPath());
                // 返回二维码存放路径
                return Result.succeed(qrCodeReq.getDestPath());
            } catch (Exception e) {
                return Result.failed(e.toString());
            }
        }
    }

#### 1.6 测试示例 ####

public class QrCodeTest {
     
    	public static void main(String[] args) throws Exception {
    		// 存放在二维码中的内容
    		String text = "文本内容/需要扫描后跳转的全路径地址";
    		// 嵌入二维码的图片路径
    		String imgPath = "D:/qrCode/1.jpg";
    		// 生成的二维码的路径及名称
    		String destPath = "D:/qrCode/qrcode/test.jpg";
    		//生成二维码
    		QRCodeUtil.encode(text, imgPath, destPath, true);
    		// 解析二维码
    		String str = QRCodeUtil.decode(destPath);
    		// 打印出解析出的内容
    		System.out.println(str);  //： 文本内容/路径地址
     
    	}
     
    }

####  ####