Java生成二维码

第一步

导入依赖包

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.1.0</version>
    </dependency>

第二步,创建class文件（QRCodeUtils ）

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 java.util.Random;

import javax.imageio.ImageIO;

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.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtils {
    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<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        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    
        QRCodeUtils.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 插入LOGO  
     *
     * @param source
     *            二维码图片  
     * @param imgPath
     *            LOGO图片地址  
     * @param needCompress
     *            是否压缩  
     * @throws Exception
     */
    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);
        if (needCompress) { // 压缩LOGO    
            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();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图    
            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();
    }

    /**
     * 生成二维码(内嵌LOGO)  
     *
     * @param content
     *            内容  
     * @param imgPath
     *            LOGO地址  
     * @param destPath
     *            存放目录  
     * @param needCompress
     *            是否压缩LOGO  
     * @throws Exception
     */
    public static String encode(String content, String imgPath, String destPath,
                              boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath,
                needCompress);
        mkdirs(destPath);
        String file = new Random().nextInt(99999999)+".jpg";
        ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
        return file;
    }

    /**
     * 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)  
     * @date 2013-12-11 上午10:16:36  
     * @param destPath 存放目录  
     */
    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();
        }
    }

    /**
     * 生成二维码(内嵌LOGO)  
     *
     * @param content
     *            内容  
     * @param imgPath
     *            LOGO地址  
     * @param destPath
     *            存储地址  
     * @throws Exception
     */
    public static void encode(String content, String imgPath, String destPath)
            throws Exception {
        QRCodeUtils.encode(content, imgPath, destPath, false);
    }

    /**
     * 生成二维码  
     *
     * @param content
     *            内容  
     * @param destPath
     *            存储地址  
     * @param needCompress
     *            是否压缩LOGO  
     * @throws Exception
     */
    public static void encode(String content, String destPath,
                              boolean needCompress) throws Exception {
        QRCodeUtils.encode(content, null, destPath, needCompress);
    }

    /**
     * 生成二维码  
     *
     * @param content
     *            内容  
     * @param destPath
     *            存储地址  
     * @throws Exception
     */
    public static void encode(String content, String destPath) throws Exception {
        QRCodeUtils.encode(content, null, destPath, false);
    }

    /**
     * 生成二维码(内嵌LOGO)  
     *
     * @param content
     *            内容  
     * @param imgPath
     *            LOGO地址  
     * @param output
     *            输出流  
     * @param needCompress
     *            是否压缩LOGO  
     * @throws Exception
     */
    public static void encode(String content, String imgPath,
                              OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath,
                needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    /**
     * 生成二维码  
     *
     * @param content
     *            内容  
     * @param output
     *            输出流  
     * @throws Exception
     */
    public static void encode(String content, OutputStream output)
            throws Exception {
        QRCodeUtils.encode(content, null, output, false);
    }

    /**
     * 解析二维码  
     *
     * @param file
     *            二维码图片  
     * @return
     * @throws Exception
     */
    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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    /**
     * 解析二维码  
     *
     * @param path
     *            二维码图片地址  
     * @return
     * @throws Exception
     */
    public static String decode(String path) throws Exception {
        return QRCodeUtils.decode(new File(path));
    } 

}

第三步,Controller层

@AuthIgnore
  @GetMapping("QRCode")
  public R QRCode() {
    String text = "I love you";    //生成二维码的内容
        String logoPath = "D:\\img\\1575892281966maxresdefault.jpg";  //二维码的logo图片
        String destPath = "D:\\img";            //生成的二维码存储本地的地址
        try {
      System.out.println(QRCodeUtils.encode(text, logoPath, destPath, true));
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return R.ok().put("msg", "成功");
  }

第四步 使用Postman访问接口

生成成功

注：本文章转载自互联网