使用java生产二维码

阳光穿透心脏的1/2处 2024-04-08 11:45 75阅读 0赞

### 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();
                  }
              }
          }
      }