上线的小程序无法在搜索中通过全称搜索到是为什么？

我在前端获取token传给后台，后台请求接口后返回的内容无法转换成图片，方法是网上找的，尝试过可以正常转换其他图片和二进制流，不知道问题出在哪了 @ResponseBody @RequestMapping("/qrTest") public Map qrTest(Long hotelId, String appId, String token) { RestTemplate rest = new RestTemplate(); InputStream inputStream = null; OutputStream outputStream = null; try { String url = "https://api.weixin.qq.com/wxa/getwxacode?access_token=" + token; Map<String, Object> param = new HashMap<>(); param.put("page", "pages/home/home"); param.put("width", 430); param.put("auto_color", false); Map<String, Object> line_color = new HashMap<>(); line_color.put("r", 0); line_color.put("g", 0); line_color.put("b", 0); param.put("line_color", line_color); System.out.println("调用生成微信URL接口传参:" + param); // MultiValueMap<String, String> headers = new LinkedMultiValueMap<>(); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); HttpEntity requestEntity = new HttpEntity(param, headers); ResponseEntity<byte[]> entity = rest.exchange(url, HttpMethod.POST, requestEntity, byte[].class, new Object[0]); System.out.println("调用小程序生成微信永久小程序码URL接口返回结果:" + entity.getBody()); byte[] result = entity.getBody(); System.out.println("\r\nold:" + Base64.encodeBase64String(result)); inputStream = new ByteArrayInputStream(result); File file = new File("f:/abc.jpg"); if (!file.exists()) { file.createNewFile(); } outputStream = new FileOutputStream(file); int len = 0; byte[] buf = new byte[1024]; while ((len = inputStream.read(buf, 0, 1024)) != -1) { outputStream.write(buf, 0, len); } outputStream.flush(); } catch (Exception e) { System.out.println("调用小程序生成微信永久小程序码URL接口异常"); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } if (outputStream != null) { try { outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; } 2.我在前端直接请求接口返回的是一堆乱码，能不能在前端直接解析成图片？ [图片]