LinkedIn API Authentication using Java

Question

I am new to Linked In API for authentication. I went the API document provided by LinkedIn. It has samples for RUBY,PYTHON and PHP. But i am asked to achieve the same using Java

Answer 1

You need to utilize some OAuth library. Try looking into Scribe.

Here's one of the LinkedIn examples in Java:

package org.scribe.examples;

import java.util.Scanner;

import org.scribe.builder.*;
import org.scribe.builder.api.*;
import org.scribe.model.*;
import org.scribe.oauth.*;

public class LinkedInExample
{
  private static final String PROTECTED_RESOURCE_URL = "http://api.linkedin.com/v1/people/~/connections:(id,last-name)";

  public static void main(String[] args)
  {
    OAuthService service = new ServiceBuilder()
                                .provider(LinkedInApi.class)
                                .apiKey("CiEgwWDkA5BFpNrc0RfGyVuSlOh4tig5kOTZ9q97qcXNrFl7zqk-Ts7DqRGaKDCV")
                                .apiSecret("dhho4dfoCmiQXrkw4yslork5XWLFnPSuMR-8gscPVjY4jqFFHPYWJKgpFl4uLTM6")
                                .build();
    Scanner in = new Scanner(System.in);

    System.out.println("=== LinkedIn's OAuth Workflow ===");
    System.out.println();

    // Obtain the Request Token
    System.out.println("Fetching the Request Token...");
    Token requestToken = service.getRequestToken();
    System.out.println("Got the Request Token!");
    System.out.println();

    System.out.println("Now go and authorize Scribe here:");
    System.out.println(service.getAuthorizationUrl(requestToken));
    System.out.println("And paste the verifier here");
    System.out.print(">>");
    Verifier verifier = new Verifier(in.nextLine());
    System.out.println();

    // Trade the Request Token and Verfier for the Access Token
    System.out.println("Trading the Request Token for an Access Token...");
    Token accessToken = service.getAccessToken(requestToken, verifier);
    System.out.println("Got the Access Token!");
    System.out.println("(if your curious it looks like this: " + accessToken + " )");
    System.out.println();

    // Now let's go and ask for a protected resource!
    System.out.println("Now we're going to access a protected resource...");
    OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
    service.signRequest(accessToken, request);
    Response response = request.send();
    System.out.println("Got it! Lets see what we found...");
    System.out.println();
    System.out.println(response.getBody());

    System.out.println();
    System.out.println("Thats it man! Go and build something awesome with Scribe! :)");
  }

}

The above can be found in this part of the Scribe repository.