生成二维码

所需要的依赖

        <!-- 二维码相关 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.0</version>
        </dependency>

java代码

    /**
     * 生成二维码
     * @param request
     * @param response
     */
    @RequestMapping(value = "/generateqrcode", method = RequestMethod.GET)
    @ResponseBody
    public void generateQRCode4Product(HttpServletRequest request, HttpServletResponse response) {
        String url = request.getParameter("url");

        QRCodeWriter qrCodeWriter = new QRCodeWriter();

        try{
        	//第一个参数为二维码的内容
       	 	//第二个参数为二维码的格式
       	 	//第三个为宽
        	//第四个为高度
            BitMatrix bitMatrix = qrCodeWriter.encode(url, BarcodeFormat.QR_CODE, 500, 500);
            //将二维码图片输出
            MatrixToImageWriter.writeToStream(bitMatrix, "png", response.getOutputStream());
        }catch (WriterException e){
            log.error(e.getMessage());
        } catch(IOException e){
            log.error(e.getMessage());
        }

    }