附上微信官方鏈接

/*** @param 用于獲取access_token* @param apiKey 小程序id* @param secretKey 小程序密鑰* @return access_token* @throws Exception*/public String postToken() throws Exception {String apiKey = Conf.getWxAppid();//小程序idString secretKey = Conf.getWxAppScrect();//小程序密鑰String grant_type = "client_credential";String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type="+grant_type+"&appid="+apiKey+"&secret="+secretKey;URL url = new URL(requestUrl);// 打開和URL之間的連接HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 設置通用的請求屬性connection.setRequestProperty("Content-Type", "application/json");connection.setRequestProperty("Connection", "Keep-Alive");connection.setUseCaches(false);connection.setDoOutput(true);connection.setDoInput(true);// 得到請求的輸出流對象DataOutputStream out = new DataOutputStream(connection.getOutputStream());out.writeBytes("");out.flush();out.close();// 建立實際的連接connection.connect();// 定義 BufferedReader輸入流來讀取URL的響應BufferedReader in = null;if (requestUrl.contains("nlp"))in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "GBK"));elsein = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));String result = "";String getLine;while ((getLine = in.readLine()) != null) {result += getLine;}in.close();JSONObject jsonObject = JSON.parseObject(result);String accesstoken=jsonObject.getString("access_token");return accesstoken;}/*** 生成帶參小程序二維碼* @param scene 要輸入的內容* @param accessToken token*/public String postMiniqrQr(String scene) {String encode = null;try{String accessToken = this.postToken();URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+accessToken);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();// conn.setConnectTimeout(10000);//連接超時 單位毫秒// conn.setReadTimeout(2000);//讀取超時 單位毫秒// 發送POST請求必須設置如下兩行httpURLConnection.setDoOutput(true); // 打開寫入屬性httpURLConnection.setDoInput(true); // 打開讀取屬性httpURLConnection.setRequestMethod("POST");// 提交方式// 不得不說一下這個提交方式轉換！！真的坑。。改了好長時間！！一定要記得加響應頭httpURLConnection.setRequestProperty("Content-Type", "application/x-javascript; charset=UTF-8");// 設置響應頭// 獲取URLConnection對象對應的輸出流PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());// 發送請求參數JSONObject paramJson = new JSONObject();paramJson.put("scene", scene); // 你要放的內容paramJson.put("path", Conf.getWxAppPath());paramJson.put("width", 430); // 寬度paramJson.put("auto_color", true);paramJson.put("is_hyaline", true);printWriter.write(paramJson.toString());// flush輸出流的緩沖printWriter.flush();BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());if (bis != null) {byte[] buffer = new byte[1024];//每次讀取的字符串長度，如果為-1，代表全部讀取完畢int len;ByteArrayOutputStream outStream = new ByteArrayOutputStream();while ((len = bis.read(buffer)) != -1) {outStream.write(buffer, 0, len);}bis.close();byte[] bytes = outStream.toByteArray(); // wxQrCode.read(bytes);BASE64Encoder base64Encoder = new BASE64Encoder();encode = base64Encoder.encode(bytes);}return encode; // //創建一個空文件 // OutputStream os = new FileOutputStream(new File("E:/test/test3.jpg")); // //ByteArrayOutputStream os = new ByteArrayOutputStream(); // int len; // byte[] arr = new byte[1024]; // while ((len = bis.read(arr)) != -1) // { // os.write(arr, 0, len); // os.flush(); // } // os.close();// 上傳云儲存//InputStream is = new ByteArrayInputStream(os.toByteArray());//retMap = UploadUtils.upload(is);}catch (Exception e){e.printStackTrace();}return encode;}

在官方文檔寫的很清楚scene只能是String類型，所以和前端要商量好傳輸格式

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