使用java生产二维码-向日葵屋

使用java生产二维码

maven导入第三方库

<dependency>
          <groupId>com.google.zxing</groupId>
          <artifactId>core</artifactId>
          <version>3.2.1</version>
      </dependency>
      <dependency>
          <groupId>com.google.zxing</groupId>
          <artifactId>javase</artifactId>
          <version>3.2.1</version>
      </dependency>

开放API接口

@RequestMapping(value = "qrcode/{w}/{h}", method = RequestMethod.GET)
        public void qrcode(@RequestParam("url") String url, @PathVariable(value = "w") Integer width, @PathVariable(value = "h") Integer height, HttpServletRequest request, HttpServletResponse response) {
      try {
          url = new String(new BASE64Decoder().decodeBuffer(url));
      } catch (IOException e) {
          LOGGER.error("BASE64进行URL解码失败");
      }
      String format = "png";
      Hashtable hints = new Hashtable();
      hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
      BitMatrix bitMatrix = null;
      File outputFile = new File("tmp.png");
      try {
          bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);
          MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
      } catch (WriterException | IOException e) {
          LOGGER.error("写入失败:"+e.getMessage());
      }
      FileInputStream fis = null;
      response.setContentType("image/png");
      try {
          OutputStream out = response.getOutputStream();
          fis = new FileInputStream(outputFile);
          byte[] b = new byte[fis.available()];
          fis.read(b);
          out.write(b);
          out.flush();
      } catch (Exception e) {
          LOGGER.error("请求失败：" + e.getMessage());
      } finally {
          if (fis != null) {
              try {
                  fis.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }
  }