生成微信小程序码java实现

 @Override
    public ModelAndView onSubmit(HttpServletRequest req, HttpServletResponse res, WxQrCodeForm cmd, BindException err) throws Exception {
        SimpleResult<Object> result = SimpleResult.create(false);
        Locale locale = new Locale("en", "US");
        ResourceBundle resource = ResourceBundle.getBundle("config/wx-config", locale);   //读取属性文件
        String appId = resource.getString("appId"); //开发者设置中的appId
        String secret = resource.getString("appSecret"); //开发者设置中的appSecret
        AccessToken accessToken = null;
        String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + secret;
        JSONObject jsonObject = WeixinUtil.httpRequest(requestUrl, "GET", null);
        // 如果请求成功
        if (null != jsonObject) {
            try {
                accessToken = new AccessToken();
                accessToken.setToken(jsonObject.getString("access_token"));
                accessToken.setExpiresIn(jsonObject.getIntValue("expires_in"));
            } catch (JSONException e) {
                accessToken = null;
                // 获取token失败
                logger.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getIntValue("errcode"), jsonObject.getString("errmsg"));
            }
        }
        String token = accessToken.getToken();
        getminiqrQr(token);
        return ModelAndViewUtil.json(result);
    }

    public Map getminiqrQr(String accessToken) {
        RestTemplate rest = new RestTemplate();
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            String url = "https://api.weixin.qq.com/weixin/getwxacode?access_token=" + accessToken;
            Map<String, Object> param = new HashMap<>();
            param.put("path", "pages/search/search"); //跳转到查询物流(自定义)
            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);
            logger.info("调用生成微信URL接口传参:" + param);
            MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
            HttpEntity requestEntity = new HttpEntity(JSON.toJSONString(param), headers);
            ResponseEntity<byte[]> entity = rest.exchange(url, HttpMethod.POST, requestEntity, byte[].class, new Object[0]);
            logger.info("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();
            logger.info(Base64.encodeBase64String(result));
            inputStream = new ByteArrayInputStream(result);
            File file = new File("/Users/apple/Desktop/abc.png");
            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) {
            logger.error("调用小程序生成微信永久小程序码URL接口异常", e);
        } 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;
    }

原文地址：https://www.cnblogs.com/dreammyone/p/10711024.html