Authorization header in Http Request in linkedin

Question

Hi in my servlet code I am requesting the server with access_token on behalf of user i am able to request with below code:

OAuthRequest request2 = new OA         


        

Answer 1

You could use the apache.http library for that. You don't need some OAuth-library or anything. The OAuth protocol is so 'easy' to handle, that you can do it with normal http requests. Here an example with the apache-http library.

[EDIT] I changed the code to give you a full example, how to use those libraries.

import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class OAuthConnect {

    public static void main(String[] args) {
        try {
            HttpClient httpclient = HttpClientBuilder.create().build();  // the http-client, that will send the request
            HttpGet httpGet = new HttpGet("");   // the http GET request
            httpGet.addHeader("Authorization", "Bearer AQXdSP_W41_UPs5ioT_t8HESyODB4FqbkJ8LrV_5mff4gPODzOYR"); // add the authorization header to the request
            HttpResponse response = httpclient.execute(httpGet); // the client executes the request and gets a response
            int responseCode = response.getStatusLine().getStatusCode();  // check the response code
            switch (responseCode) {
                case 200: { 
                    // everything is fine, handle the response
                    String stringResponse = EntityUtils.toString(response.getEntity());  // now you have the response as String, which you can convert to a JSONObject or do other stuff
                    break;
                }
                case 500: {
                    // server problems ?
                    break;
                }
                case 403: {
                    // you have no authorization to access that resource
                    break;
                }
            }
        } catch (IOException | ParseException ex) {
            // handle exception
        }
    }
}

And here you can find the jar files which you can add as a library:

Apache HTTP-Core v 4.3.3
Apache HTTP-Client v 4.3.6

You can also download that jars from the Apache page

As you will see, the libraries provide you with everything to handle all Requests you may need to access the API (GET POST DELETE..). You can change the headers and handle what ever content you get as a response. I know it looks complicated, but with this you will have full control over you OAuth requests and don't need to rely on any library.

[Yet another EDIT]
When you download the zip files from the Apache page you need to unpack them and the jar file you need is within the lib folder.

httpcomponents-core-4.3.3
   +-examples
   +-lib
      +-commons-cli-1.2.jar
      +-httpcore-4.3.3.jar   <-- this one you need
      +-httpcore-ab-4.3.3.jar
     ...

and the same with the httpClient

httpcomponents-client-4.3.6
   +-examples
   +-lib
      +- commons-codec-1.6.jar
      +- ...
      +- httpclient-4.3.6.jar  <-- this one
      +- ...