JAVA 生成二维码 并设置 失效机制

1.前言：我这里设置的失效机制用数据库记录每一张二维码的实效时间，二维码生成后上传至OSS

1.1 数据库设计

CREATE TABLE `qz_date` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `uuid` varchar(255) DEFAULT NULL COMMENT '二维码标号',
  `url` varchar(255) DEFAULT NULL COMMENT '二维码地址',
  `end_time` datetime DEFAULT NULL COMMENT '失效时间',
  `created_at` datetime DEFAULT NULL COMMENT '创建时间',
  `last_modified` datetime DEFAULT NULL COMMENT '修改时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4;

2 二维码生成

2.1 导入以来

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

2.2 生成和解析二维码工具类

@Slf4j
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;

    public 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;
    }

    public static BufferedImage createImage(String content) 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);
            }
        }
        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) {
            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));
    }


    public static String upLoad(String uuid, BufferedImage image, String fileApi){
        String iconUrl = null;
        if (image!=null) {
            InputStream inputStream = bufferedImageToInputStream(image);
            Map<String, String> params = new HashMap<>(16);
            params.put("token", "oh, it's ok");
            String fileName = uuid + ".png";
            String result = UploadFile.uploadFileStream(fileApi, fileName, inputStream, params, new HashMap<>());
            Map resultMap = JSON.parseObject(result.substring(1, result.length() - 1), Map.class);
            iconUrl = resultMap.get("url").toString();
        }
        return iconUrl;
    }

    private static InputStream bufferedImageToInputStream(BufferedImage image){
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ImageIO.write(image, "png", os);
            InputStream input = new ByteArrayInputStream(os.toByteArray());
            return input;
        } catch (IOException e) {
            log.error("提示:",e);
        }
        return null;
    }


}  

3.测试

@PostMapping("/getCode")
    @ApiOperation(value = "生成二维码", notes = "生成二维码")
    public ApiResponse getCode(@RequestBody JSONObject par,HttpServletRequest request) throws Exception {

        Integer elId = par.getInteger("elId");
        String url = par.getString("url");
        //二维码标识
      	String uuid = UUID.randomUUID().toString();
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("url",url);
        jsonObject.put("elId",elId);
        jsonObject.put("qzId",uuid);

       //生成二维码
      	BufferedImage image = QRCodeUtils.createImage(jsonObject.toJSONString());
        //上传二维码到OSS
      	String s = QRCodeUtils.upLoad(uuid, image, fileApi);
        
      	QzDate qzDate = new QzDate();
        qzDate.setUuid(uuid);
        qzDate.setUrl(s);
        //二维码有效期
      	qzDate.setEndTime(LocalDateTime.now().plusDays(3));
        iQzDateService.save(qzDate);
        return ApiResponse.success(s);
    }

3.1 测试有效期

@PostMapping("/getBizElement")
    @ApiOperation(value = "前台查询元素信息展示", notes = "前台使用")
    public ApiResponse<BizResponseParam> findBizBasicElement(@RequestBody JSONObject param, HttpServletRequest req) {
        Integer elId = param.getInteger("elId");
        String qzDate = param.getString("uuid");
				
				//查询二维码是否过期
        QueryWrapper<QzDate> qzDateQueryWrapper = new QueryWrapper<>();
        qzDateQueryWrapper.eq("uuid", qzDate);
        QzDate one = iQzDateService.getOne(qzDateQueryWrapper);
        LocalDateTime endTime = one.getEndTime();
        LocalDateTime now = LocalDateTime.now();
        ApiResponse<BizResponseParam> apiResponse = new ApiResponse<>();

        if (endTime.compareTo(now)>0) {
           //逻辑 。。。。
        } else {
            apiResponse.setErrorMsg("二维码已过期");
            apiResponse.setErrorCode(500);
        }
        return apiResponse;
    }