博客

1.依赖：

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>core</artifactId>
			<version>3.4.1</version>
		</dependency>

2.工具类：

第一个类

：谷歌提供的帮助的类

package com.zyp.util.code;

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

/**
 * @author leishen
 */
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) {
                    image.setRGB(x, y, 0xFFFFFFFF); // = white
                }
            }
        }

        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);
    }

}

第二个类

:个人封装的工具类

package com.zyp.util.code;

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.lang3.StringUtils;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.swing.filechooser.FileSystemView;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;


public class QRCodeUtil {

    /**
     * 二维码颜色 默认是黑色
     */
    private static final int QRCOLOR = 0xFF000000;

    /**
     * 背景颜色 白色
     */
    private static final int BGWHITE = 0xFFFFFFFF;


    /**
     * 编码
     */
    private static final String CHARSET = "utf-8";

    /**
     *  二维码尺寸-宽度
     */
    private static int QRCODE_WIDTH=300;

    /**
     *  二维码尺寸-高度
     */
    private static int QRCODE_HEIGHT=300;

    /**
     * 画布高度
     */
    private static int CANVAS_HEIGHT=350;

    /**
     * 画布宽度
     */
    private static  int CANVAS_WIDTH=300;

    /**
     * LOGO默认最大宽度
     */
    private static  int LOGO_WIDTH = 90;

    /**
     * LOGO默认最大高度
     */
    private static  int LOGO_HEIGHT = 90;

    /**
     * 设置logo大小
     * @param logoWidth LOGO默认最大宽度
     * @param logHeight LOGO默认最大高度
     * @return
     */
    public static void setLogoSize(int logoWidth,int logHeight){
        QRCodeUtil.LOGO_WIDTH=logoWidth;
        QRCodeUtil.LOGO_HEIGHT=logHeight;
    }

    /**
     * 设置画布大小
     * @param canvasWidth 二维码尺寸-宽度
     * @param canvasHeight 二维码尺寸-高度
     * @return
     */
    public static void setCanvasSize(int canvasWidth,int canvasHeight){
        QRCodeUtil.CANVAS_WIDTH=canvasWidth;
        QRCodeUtil.CANVAS_HEIGHT=canvasHeight;
    }

    /**
     * 设置二维码大小
     * @param qrcodeWidth 画布宽度
     * @param qrcodeHeight 画布高度
     * @return
     */
    public static void setQrCodeSize(int qrcodeWidth,int qrcodeHeight){
        QRCodeUtil.QRCODE_WIDTH=qrcodeWidth;
        QRCodeUtil.QRCODE_HEIGHT=qrcodeHeight;
    }

    /**
     * 创建纯净的二维码
     * @param content 二维码内容
     * @return
     * @throws Exception
     */
    public static BufferedImage createQRCode(String content) throws Exception {
        if (StringUtils.isBlank(content)) {
            throw new Exception("二维码内容不能为空");
        }
        //用于设置QR二维码参数
        Hashtable hints = new Hashtable();
        // 容错级别设置 默认为L
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 字符转码格式设置
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        // 空白边距设置
        hints.put(EncodeHintType.MARGIN, 0);
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        BitMatrix bm = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE,QRCODE_WIDTH, QRCODE_HEIGHT,hints);
        //创建一个图片缓冲区存放二维码图片
        BufferedImage image = new BufferedImage(QRCODE_WIDTH, QRCODE_HEIGHT, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < QRCODE_WIDTH; x++) {
            for (int y = 0; y < QRCODE_HEIGHT; y++) {
                image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
            }
        }
        return image;
    }

    /**
     * 二维码里面插入logo
     *
     * @param source       图片对象
     * @param logoPath      logo路径
     * @param needCompress true表示将嵌入二维码的图片进行压缩，false为则表示不压缩
     * @return
     * @throws Exception
     */
    public static BufferedImage insertLogo(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
        File file = new File(logoPath);
        if (!file.exists()) {
            throw new Exception("logo图片路径"+logoPath+"不存在");
        }
        //读取图片
        Image src = ImageIO.read(new File(logoPath));
        // 获取图像的宽度
        int width = src.getWidth(null);
        // 获取图像的宽度
        int height = src.getHeight(null);
        if (needCompress) {
            if (width > LOGO_WIDTH) {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT) {
                height = LOGO_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_WIDTH - width) / 2;
        int y = (QRCODE_HEIGHT - 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.dispose();
        graph.draw(shape);
        source.flush();
        return source;
    }

    /**
     * 文件解密
     * @param file 文件对象
     * @return
     * @throws Exception
     */
    public static String decode(File file) throws Exception {
        if (!file.exists()) {
            throw new Exception("文件不存在");
        }
        BufferedImage image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        Result result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }

    /**
     * 在二维码下方添加文字 --建议最后添加下方文字
     * @param image 图片对象
     * @param font 字体格式 默认宋体 28号
     * @param color 字体颜色 默认白色
     * @param pressText 下方文字
     * @return
     * @throws Exception
     */
    public static BufferedImage pressText(BufferedImage image,Font font,Color color,String pressText) throws Exception {
        if (StringUtils.isBlank(pressText)) {
            throw new Exception("文字不能为空");
        }
        pressText = new String(pressText.getBytes(), "utf-8");
        //TYPE_INT_RGB设置颜色
        BufferedImage finalImage = new BufferedImage(CANVAS_WIDTH, CANVAS_HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics g = finalImage.createGraphics();
        // 在画布上画上二维码  X轴Y轴，宽度高度
        g.drawImage(image, 0, 0, image.getWidth(), image.getHeight(),null);
        //设置画笔的颜色
        if (color==null) {
            g.setColor(Color.WHITE);
        }else{
            g.setColor(color);
        }
        if (font==null) {
            font = new Font("宋体",  Font.PLAIN, 28);
        }
        g.setFont(font);
        //drawString(文字信息、x轴、y轴)方法根据参数设置文字的坐标轴 ，根据需要来进行调整
        int startX =(QRCODE_WIDTH - g.getFontMetrics().stringWidth(pressText)) / 2;
        int startY =CANVAS_HEIGHT-(CANVAS_HEIGHT-QRCODE_HEIGHT)/2+font.getSize()/4;
        g.drawString(pressText, startX, startY);
        g.dispose();
        image=finalImage;
        image.flush();
        return image;
    }

    /**
     * 输出到本地
     * @param image 图片对象
     * @param formatName 格式 默认png
     * @param destPath 路径 默认桌面
     * @throws IOException
     */
    public static void writeToLocalByPath(RenderedImage image,String formatName,String destPath) throws IOException {
        if (formatName==null) {
            formatName="png";
        }
        if (StringUtils.isBlank(destPath)) {
            //当前用户桌面路径
            File desktopDir = FileSystemView.getFileSystemView() .getHomeDirectory();
            long l = System.currentTimeMillis();
            destPath= desktopDir.getAbsolutePath()+"\\"+l+"."+formatName;
        }
        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();
        }
        ImageIO.write(image, formatName,file);
    };

    /**
     * 输出到本地
     * @param image 图片对象
     * @param formatName 格式 默认png
     * @param file 文件对象
     * @throws IOException
     */
    public static void writeToLocalByFile(RenderedImage image,String formatName,File file) throws IOException {
        // 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();
        }
        if (formatName==null) {
            formatName="png";
        }
        ImageIO.write(image, formatName, file);
    };

    /**
     * 输出到客户端
     * @param image 图片对象
     * @param formatName 格式 默认png
     * @param response 响应
     * @throws IOException
     */
    public static void writeToStream(RenderedImage image, String formatName, HttpServletResponse response) throws IOException {
        if (formatName==null) {
            formatName="png";
        }
        ImageIO.write(image, formatName, response.getOutputStream());
    }

    public static void main(String[] args) throws Exception {
        // 存放在二维码中的内容
//        String content = "https://qr.alipay.com/fkx17652i95teercapvji5d";
//        BufferedImage image = QRCodeUtil.createQRCode(content);
//        image=QRCodeUtil.pressText(image,null,Color.GREEN,"扫一扫向我付款");
//        String imgPath = "D:\\qrCode\\1.jpg";
//        image=QRCodeUtil.insertLogo(image,imgPath,true);
//        String destPath = "D:\\qrCode\\test.jpg";
        String destPath = "C:\\Users\\leishen\\Desktop\\20221123.jpeg";
//        QRCodeUtil.writeToLocalByPath(image, "jpg", null);
        String decode = QRCodeUtil.decode(new File(destPath));
        System.out.println("decode = " + decode);
    }
}

3.代码测试

3.1.控制层：

package com.zyp.controller;

import com.zyp.model.dto.QRCodeDto;
import com.zyp.util.code.QRCodeUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;

@RestController
@RequestMapping("qRCode/")
@Api(tags = "二维码测试")
public class QRCodeController {

    /**
     * 由于有MultipartFile,此处不能使用@RequestBody
     * @param dto
     * @param response
     * @throws Exception
     */
    @ApiOperation("生成二维码")
    @PostMapping(value = "generateQRCode")
    public void generateQRCode(@Validated QRCodeDto dto, HttpServletResponse response){
        // 存放在二维码中的内容
        String content = dto.getContent();
        BufferedImage image = null;
        File uploadFile = null;
        try {
            image = QRCodeUtil.createQRCode(content);
            uploadFile =getUploadFile(dto.getLogoFile());
            image=QRCodeUtil.pressText(image,null, Color.GREEN,dto.getPressText());
            image=QRCodeUtil.insertLogo(image,uploadFile.getPath(),true);
            QRCodeUtil.writeToStream(image, "jpg", response);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            if (uploadFile != null) {
                //删除临时文件
                uploadFile.delete();
            }
        }
    }

    @ApiOperation("二维码解析")
    @PostMapping("parseQRCode")
    public String parseQRCode(@RequestParam(value = "file") MultipartFile file)  {
        File uploadFile = null;
        try {
            uploadFile = getUploadFile(file);
            String decode = QRCodeUtil.decode(uploadFile);
            return decode;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            if (uploadFile != null) {
                //删除临时文件
                uploadFile.delete();
            }
        }
    }

    /**
     * 获取上传的文件
     * @param file
     * @return
     * @throws Exception
     */
    private static File getUploadFile(MultipartFile file) throws Exception {
        if (file ==null) {
            throw new Exception("上传文件不能为空");
        }
        String filename = file.getOriginalFilename();
        String suffixName = filename.substring(filename.lastIndexOf("."));
        String filePath ="D:\\temp\\";
        long l = System.currentTimeMillis();
        File file1=new File(filePath+l+suffixName);
        if (!file1.exists() && !file1.isDirectory()) {
            file1.mkdirs();
        }
        file.transferTo(file1);
        return file1;
    }
}

2.请求实体类：

package com.zyp.model.dto;

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import org.springframework.web.multipart.MultipartFile;

import javax.validation.constraints.NotBlank;

@Data
public class QRCodeDto {


    @NotBlank(message = "二维码内容不能为空")
    @ApiModelProperty("二维码内容")
    private String content;

    @ApiModelProperty("logo图片")
    private MultipartFile logoFile;

    @ApiModelProperty("二维码下方文字")
    private String pressText;
}

3.生成二维码

postman调试：



结果：

4.解析二维码

接口请求：

结果：