利用weixin-java-miniapp生成小程序码并直接返回图片文件流的方法

// 获取小程序服务实例WxMaService wxMaService = WxMaConfiguration.getWxMaService();// 获取小程序二维码生成实例WxMaQrcodeService wxMaQrcodeService = wxMaService.getQrcodeService();// 设置小程序二维码线条颜色为黑色WxMaCodeLineColor lineColor = new WxMaCodeLineColor("0", "0", "0");// 生成二维码图片字节流（此处也可以生成File类型，如果想将图片文件保存到服务器就生成File类型，此处生成byte[]类型，方便直接返回文件流到前端）byte[] qrCodeBytes = null;qrCodeBytes = wxMaQrcodeService.createWxaCodeUnlimitBytes(String.valueOf(id), null, 430, false, lineColor, false);

@RestController@RequestMapping("/qrCode")public class QrCodeController { private static final Logger logger = LoggerFactory.getLogger(QrCodeController.class); @GetMapping("/getMiniappQrCode/{id}") public void getMiniappQrCode(@PathVariable("id") Long id, HttpServletRequest request, HttpServletResponse response) throws Exception{  // 获取小程序服务实例  WxMaService wxMaService = WxMaConfiguration.getWxMaService();  // 获取小程序二维码生成实例  WxMaQrcodeService wxMaQrcodeService = wxMaService.getQrcodeService();  // 设置小程序二维码线条颜色为黑色  WxMaCodeLineColor lineColor = new WxMaCodeLineColor("0", "0", "0");  // 生成二维码图片字节流  byte[] qrCodeBytes = null;  try{   qrCodeBytes = wxMaQrcodeService.createWxaCodeUnlimitBytes(String.valueOf(id), null, 430, false, lineColor, false);  } catch(Exception e){   logger.error("生成小程序码出错", e);  }  // 设置contentType  response.setContentType("image/png");  // 写入response的输出流中  OutputStream stream = response.getOutputStream();  stream.write(qrCodeBytes);  stream.flush();  stream.close(); }}