java applet to log micro letter

 Log in micro letter

 

Development preparation before (must)

　　Applet identification (appid): wx4d4838ebec29b8 **

　　Applet secret key (secret): 4fd6ca38a1261f96cbc0314c5675b9 **

 

Log in micro-channel official website:  https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/login/auth.code2Session.html 

According to official documents

 

 

 

 

 Interface login java

// pass the front end of your code  
public  void wxlogin (String code) {
 
　　　　　// fill in your appid small and secret procedures, as well as the front passed to your code, the last parameter is fixed 
        String TOKEN_URL = "HTTPS: // api.weixin.qq.com/sns/jscode2session?appid= "+ WxConfig.APP_ID +" Secret = & "+ WxConfig.SECRET +" & js_code = "+ code +" = authorization_code & grant_type " ; 
        the JSONObject the access_token = httpsRequestToJsonObject (TOKEN_URL," GET ", null ); 
　　　　　

//         openid String that uniquely identifies the user this is your micro-channel user ID 
        String openid = access_token.getString (" openid " );
//         session_key String session key
        String session_key = access_token.getString("session_key");
//        errcode    number    错误码
        String errcode = access_token.getString("errcode");
//        errmsg    string    错误信息
        String errmsg = access_token.getString("errmsg");

        if ("-1".equals(errcode)) {
            System.err.println(errmsg);
            return;
        }
        if ("4029".equals(errcode)) {
            System.err.println(errmsg);
            return;
        }
        if ("45011".equals(errcode)) {
            System.err.println(errmsg);
            return ; 
        } the else {
             // prove no problem
             // save openid to your database, call your service business   
        } 

    } 

    public  static JSONObject httpsRequestToJsonObject (String requestUrl, requestMethod String, String outputStr) { 
        JSONObject jsonObject = null ;
         the try { 
            StringBuffer Buffer = httpsRequest (requestUrl, requestMethod, outputStr); 
            jsonObject = JSONObject.fromObject (buffer.toString ()); 
        } the catch  (a ConnectException CE) {
            System.err.println ("请求连接超时"+ce);
        } catch (Exception e) {
            System.err.println("https请求异常：" + e.getMessage());
        }
        return jsonObject;
    }

    private static StringBuffer httpsRequest(String requestUrl, String requestMethod, String output)
            throws NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException, MalformedURLException,
            IOException, ProtocolException, UnsupportedEncodingException {
        URL url = new URL(null, requestUrl, new Handler());
        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setUseCaches(false);
        connection.setRequestMethod(requestMethod);
        if (null != output) {
            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(output.getBytes("UTF-8"));
            outputStream.close();
        }
        // 从输入流读取返回内容
        InputStream inputStream = connection.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String str = null;
        StringBuffer buffer = new StringBuffer();
        while ((str = bufferedReader.readLine()) != null) {
            buffer.append(str);
        }
        bufferedReader.close();
        inputStreamReader.close();
        inputStream.close();
        inputStream = null;
        connection.disconnect();
        return buffer;
    }

 

 If appid and secret hundred percent right, then this would be no problem!