如何实现客户端凭据流（两足式OAuth）以连接到LinkedIn API？

Question

1. 当我尝试official page或other example时。

2. 我得到了：{"error":"access_denied","error_description":"This application is not allowed to create application tokens"}

3. 我在下面添加了我的代码，但是我没有获得访问令牌。这表明不允许应用程序创建应用程序令牌。字符串urlParameters =“ grant_type = client_credentials＆client_id =” + linkedInClientId +“＆client_secret =” + linkedInClientSecret;字符串urlParametersEncoded =“”;尝试{urlParametersEncoded = URLEncoder.encode（urlParameters，“ UTF-8”）;} catch（Exception e）{System.out.println（“ URL编码错误。” + e）;}

   String url = "https://www.linkedin.com/oauth/v2/accessToken?"+urlParametersEncoded;
   String access_token = "null";
   try {
       URL obj = new URL(url);
       HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
   
       //add reuqest header
       con.setRequestMethod("POST");
       con.setRequestProperty("Host", "www.linkedin.com");
       con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
   
       // Send post request
       con.setDoOutput(true);
       DataOutputStream wr = new DataOutputStream(con.getOutputStream());
       wr.writeBytes(urlParameters);
       wr.flush();
       wr.close();
   
       int responseCode = con.getResponseCode();
       System.out.println("\nSending 'POST' request to URL : " + url);
       System.out.println("Post parameters : " + urlParameters);
       System.out.println("Response Code : " + responseCode);
   
       BufferedReader in = new BufferedReader(
               new InputStreamReader(con.getInputStream()));
       String inputLine;
       StringBuffer response = new StringBuffer();
   
       while ((inputLine = in.readLine()) != null) {
           response.append(inputLine);
       }
       in.close();
   
       //print result
       //System.out.println(response.toString());
   
       JSONObject jsonObj = new JSONObject(response.toString());
       access_token = jsonObj.getString("access_token");
       System.out.println("!!!!!!!!!!!"+access_token);
   } catch(Exception e) {
       System.out.println("error token.." + e);
   }
   
   return access_token;
   

   }

Answer 1

所有两条腿的流程都需要伙伴关系/扩展访问权限[https://developer.linkedin.com/partner-programs]

请按照三足流程的步骤操作，它对我有用，

在浏览器中访问此https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id=81101e5urkn5nv&redirect_uri=https://localhost:8080/auth/callback&state=aRandomString&scope=r_emailaddress