微信公众号通过code获取用户openid - 好文

一、获取code

用户进入微信公众号即可获得code，直接通过request.getParameter("code")获得

二、根据code获取openid

还需要微信APPID、SECRET

   /**
   * 通过CODE取得浏览网页用户的OPenID
   *
   * @param code
   * @return
   */
   public static JSONObject getWeixinUserOpenID(String AppID, String
secret,String code) {
       JSONObject jsonObject = null;
       String requestUrl =
"https://api.weixin.qq.com/sns/oauth2/access_token?appid="
               + AppID
               + "&secret="
               + secret
               + "&code="
               + code
               + "&grant_type=authorization_code";
       logger.info("requestUrl==="+requestUrl);
       StringBuffer buffer = new StringBuffer();
       try {
           // 创建SSLContext对象，并使用我们指定的信任管理器初始化
           TrustManager[] tm = { new MyX509TrustManager() };
           SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
           sslContext.init(null, tm, new java.security.SecureRandom());
           // 从上述SSLContext对象中得到SSLSocketFactory对象
           SSLSocketFactory ssf = sslContext.getSocketFactory();

           URL url = new URL(requestUrl);
           HttpsURLConnection httpUrlConn = (HttpsURLConnection)
url.openConnection();
           httpUrlConn.setSSLSocketFactory(ssf);
           httpUrlConn.setDoOutput(true);
           httpUrlConn.setDoInput(true);
           httpUrlConn.setUseCaches(false);
           // 设置请求方式（GET/POST）
           httpUrlConn.setRequestMethod("GET");

           if ("GET".equalsIgnoreCase("GET"))
               httpUrlConn.connect();
           // 将返回的输入流转换成字符串
           InputStream inputStream = httpUrlConn.getInputStream();
           InputStreamReader inputStreamReader = new
InputStreamReader(inputStream, "utf-8");
           BufferedReader bufferedReader = new
BufferedReader(inputStreamReader);

           String str = null;
           while ((str = bufferedReader.readLine()) != null) {
               buffer.append(str);
           }
           bufferedReader.close();
           inputStreamReader.close();
           // 释放资源
           inputStream.close();
           inputStream = null;

           httpUrlConn.disconnect();

             jsonObject = JSONObject.fromObject(buffer.toString());

            String openid =
jsonObject.getString("openid");//openid从解析出的jsonObject中直接获取

           logger.info("buffer.toString()==="+buffer.toString());
           // jsonObject = JSONObject.fromObject(buffer.toString());
       } catch (ConnectException ce) {
           logger.info("Weixin server connection timed out.");
       } catch (Exception e) {
           logger.info("https request error:{}"+ e.getMessage());
       }
       return jsonObject;

   }

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