SpringBoot获取小程序二维码

@ApiOperation(value = "获取小程序二维码")
	@PostMapping(value = "/getCode")
	public SuccessOutPut<String> getCode(@RequestBody CodesInput code,HttpServletRequest request) {
		

		StringBuffer backUrl = new StringBuffer(); // 回调url
		String fileName = UUID.randomUUID().toString() + System.currentTimeMillis()+ (".jpg");
		try {
			StringBuffer info = new StringBuffer("https://api.weixin.qq.com/wxa/getwxacodeunlimit?");
			URL url = null;
			String accessToken = AccessToken.getAccessToken();
			if (null != accessToken) {
				url = new URL(info.append("access_token=").append(accessToken).toString());
			} else {
				String accessToken2 = AccessToken.getAccessToken();
				url = new URL(info.append("access_token=").append(accessToken2).toString());
			}
			HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");// 提交模式
            httpURLConnection.setRequestProperty("Content-type", "application/json"); 
            // conn.setConnectTimeout(10000);//连接超时 单位毫秒
            // conn.setReadTimeout(2000);//读取超时 单位毫秒
            // 发送POST请求必须设置如下两行
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
            // 发送请求参数
            JSONObject paramJson = new JSONObject();
            paramJson.put("scene", code.getScene());
            paramJson.put("page", code.getPage());
            paramJson.put("width", 430);
            printWriter.write(paramJson.toString());
            // flush输出流的缓冲
            printWriter.flush();
         
            //开始获取数据
            BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());

            ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
            //buff用于存放循环读取的临时数据
            byte[] buff = new byte[100];
            int rc = 0;
            while ((rc = bis.read(buff, 0, 100)) > 0) {
                swapStream.write(buff, 0, rc);
            }
            ByteArrayInputStream inputStream= new ByteArrayInputStream(swapStream.toByteArray());
            BufferedImage image = ImageIO.read(inputStream);
            /**裁剪原图  目前访问微信 微信返回的是 470*535 像素 170620*/
            BufferedImage subImage = image.getSubimage(0, 0, image.getWidth(), image.getHeight());


            BufferedImage inputbig = new BufferedImage(430, 430, BufferedImage.TYPE_INT_BGR);
            Graphics2D g = (Graphics2D) inputbig.getGraphics();
            g.drawImage(subImage, 0, 0,430,430,null); //画图
            g.dispose();
            inputbig.flush();
            ImageIO.write(inputbig, "jpg", new File("/home/images/"+fileName));
        } catch (Exception e) {
            e.printStackTrace();
        }
		StringBuffer append = backUrl.append(getBackUrl(getServerIPPort(request), fileName));
		return new SuccessOutPut<>(append.toString());

 

来源：CSDN

作者：Ais永恒

链接：https://blog.csdn.net/xinxin172170185/article/details/87936852