Java后台获取微信小程序用户信息、openid

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/**  * 获取微信小程序 session_key 和 openid  *  * @param code 调用微信登陆返回的Code  * @return  */ public static JSONObject getSessionKeyOropenid(String code) {     //微信端登录code值     String wxCode = code;     Locale locale = new Locale("en", "US");     ResourceBundle resource = ResourceBundle.getBundle("config/wx-config",locale);   //读取属性文件     String requestUrl = resource.getString("url");  //请求地址 https://api.weixin.qq.com/sns/jscode2session     Map<String, String> requestUrlParam = new HashMap<String, String>();     requestUrlParam.put("appid", resource.getString("appId"));  //开发者设置中的appId     requestUrlParam.put("secret", resource.getString("appSecret")); //开发者设置中的appSecret     requestUrlParam.put("js_code", wxCode); //小程序调用wx.login返回的code     requestUrlParam.put("grant_type", resource.getString("grantType"));    //默认参数 authorization_code       //发送post请求读取调用微信 https://api.weixin.qq.com/sns/jscode2session 接口获取openid用户唯一标识     JSONObject jsonObject = JSON.parseObject(sendPost(requestUrl, requestUrlParam));     return jsonObject; }   /**  * 向指定 URL 发送POST方法的请求  *  * @param url 发送请求的 URL  * @return 所代表远程资源的响应结果  */ public static String sendPost(String url, Map<String, ?> paramMap) {     PrintWriter out = null;     BufferedReader in = null;     String result = "";       String param = "";     Iterator<String> it = paramMap.keySet().iterator();       while (it.hasNext()) {         String key = it.next();         param += key + "=" + paramMap.get(key) + "&";     }       try {         URL realUrl = new URL(url);         // 打开和URL之间的连接         URLConnection conn = realUrl.openConnection();         // 设置通用的请求属性         conn.setRequestProperty("accept", "*/*");         conn.setRequestProperty("connection", "Keep-Alive");         conn.setRequestProperty("Accept-Charset", "utf-8");         conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");         // 发送POST请求必须设置如下两行         conn.setDoOutput(true);         conn.setDoInput(true);         // 获取URLConnection对象对应的输出流         out = new PrintWriter(conn.getOutputStream());         // 发送请求参数         out.print(param);         // flush输出流的缓冲         out.flush();         // 定义BufferedReader输入流来读取URL的响应         in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));         String line;         while ((line = in.readLine()) != null) {             result += line;         }     } catch (Exception e) {         log.error(e.getMessage(), e);     }     //使用finally块来关闭输出流、输入流     finally {         try {             if (out != null) {                 out.close();             }             if (in != null) {                 in.close();             }         } catch (IOException ex) {             ex.printStackTrace();         }     }     return result; }    /**      * 解密用户敏感数据获取用户信息      *      * @param sessionKey    数据进行加密签名的密钥      * @param encryptedData 包括敏感数据在内的完整用户信息的加密数据      * @param iv            加密算法的初始向量      * @return      * */     public static JSONObject getUserInfo(String encryptedData, String sessionKey, String iv) {         // 被加密的数据         byte[] dataByte = Base64Util.decodeByte(encryptedData);         // 加密秘钥         byte[] keyByte = Base64Util.decodeByte(sessionKey);         // 偏移量         byte[] ivByte = Base64Util.decodeByte(iv);         try {               // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要             int base = 16;             if (keyByte.length % base != 0) {                 int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);                 byte[] temp = new byte[groups * base];                 Arrays.fill(temp, (byte) 0);                 System.arraycopy(keyByte, 0, temp, 0, keyByte.length);                 keyByte = temp;             }             // 初始化             Security.addProvider(new BouncyCastleProvider());             Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");             SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");             AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");             parameters.init(new IvParameterSpec(ivByte));             cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化             byte[] resultByte = cipher.doFinal(dataByte);             if (null != resultByte && resultByte.length > 0) {                 String result = new String(resultByte, "UTF-8");                 return JSON.parseObject(result);             }         } catch (NoSuchAlgorithmException e) {             log.error(e.getMessage(), e);         } catch (NoSuchPaddingException e) {             log.error(e.getMessage(), e);         } catch (InvalidParameterSpecException e) {             log.error(e.getMessage(), e);         } catch (IllegalBlockSizeException e) {             log.error(e.getMessage(), e);         } catch (BadPaddingException e) {             log.error(e.getMessage(), e);         } catch (UnsupportedEncodingException e) {             log.error(e.getMessage(), e);         } catch (InvalidKeyException e) {             log.error(e.getMessage(), e);         } catch (InvalidAlgorithmParameterException e) {             log.error(e.getMessage(), e);         } catch (NoSuchProviderException e) {             log.error(e.getMessage(), e);         }         return null;     }