(Java) Twitter - Get Follower IDs

Demonstrates how to get a list of follower IDs for a Twitter user. If the number of followers is more than can be returned in a single response, this example will use cursors to page through the followers.

Note: Rate limits will prevent a program from paging through huge lists of followers. In general, a maximum of 16 GET requests (pages) can be retrieved in a short period of time.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // ----------------------------------------------------------------------
    // This initial setup, which involves setting the OAuth1 properties and connecting
    // to api.twitter.com, is only required once at the beginning.  Once connected, the same
    // object instance may be re-used, and if necessary, it will automatically reconnect
    // as needed.

    // Assume we've previously obtained an access token and saved it to a JSON file..
    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/twitter.json");

    CkRest rest = new CkRest();
    CkOAuth1 oauth1 = new CkOAuth1();

    oauth1.put_ConsumerKey("TWITTER_CONSUMER_KEY");
    oauth1.put_ConsumerSecret("TWITTER_CONSUMER_SECRET");
    oauth1.put_Token(json.stringOf("oauth_token"));
    oauth1.put_TokenSecret(json.stringOf("oauth_token_secret"));
    oauth1.put_SignatureMethod("HMAC-SHA1");
    oauth1.GenNonce(16);

    rest.SetAuthOAuth1(oauth1,false);

    boolean bAutoReconnect = true;
    success = rest.Connect("api.twitter.com",443,true,bAutoReconnect);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // This ends the initial setup...
    // ----------------------------------------------------------------------

    // This Twitter user has about 77.5K followers..
    rest.AddQueryParam("screen_name","MarcusMiller959");

    CkJsonObject jsonResponse = new CkJsonObject();
    jsonResponse.put_EmitCompact(false);

    // Get the 1st page of results using a cursor of "-1".
    CkStringBuilder sbNextCursor = new CkStringBuilder();
    sbNextCursor.SetString("-1");

    int pageNum = 1;
    boolean caseSensitive = false;
    boolean bContinue = true;
    // Get a maximum of 5 pages (of 5000 ids each).
    while (bContinue == true) {

        if (sbNextCursor.ContentsEqual("0",caseSensitive) == true) {
            // This will cause the loop to exit..
            bContinue = false;
            }
        else {
            // Adds or replaces the query param.
            rest.AddQueryParam("cursor",sbNextCursor.getAsString());

            // Get the next page of follower IDs
            String resp = rest.fullRequestNoBody("GET","/1.1/followers/ids.json");
            if (rest.get_LastMethodSuccess() != true) {
                System.out.println(rest.lastErrorText());
                return;
                }

            jsonResponse.Load(resp);

            if (rest.get_ResponseStatusCode() != 200) {
                System.out.println(jsonResponse.emit());
                return;
                }

            // Show the number of IDs returned in this 
            int numIds = jsonResponse.SizeOfArray("ids");
            System.out.println("Page " + pageNum + ", Number of Ids: " + numIds);

            // Show the 1st 10 ids in this page.
            int i = 0;
            while (i < numIds) {
                jsonResponse.put_I(i);
                System.out.println("    " + i + ": " + jsonResponse.stringOf("ids[i]"));

                i = i+1;
                if (i > 10) {
                    // Force the loop to exit.
                    i = numIds;
                    }

                }

            pageNum = pageNum+1;
            if (pageNum > 5) {
                bContinue = false;
                }
            else {
                sbNextCursor.SetString(jsonResponse.stringOf("next_cursor_str"));
                }

            }

        }

    // A successful JSON response for the 1st page looks like this:

    // 	{
    // 	  "ids": [
    // 	    3140496044,
    // 	    793204773751324672,
    // 	    789951187781050369,
    // 	    763520773587922945,
    // 	    ...
    // 	    15031286,
    // 	    2668251246,
    // 	    3751659443
    // 	  ],
    // 	  "next_cursor": 1531680438812851153,
    // 	  "next_cursor_str": "1531680438812851153",
    // 	  "previous_cursor": 0,
    // 	  "previous_cursor_str": "0"
    // 	}

    // The output of this program looks like this:

    // 	Page 1, Number of Ids: 5000
    // 	    0: 931953350
    // 	    1: 786708055
    // 	    2: 560845700
    // 	    3: 3140496044
    // 	    4: 793204773751324672
    // 	    5: 789951187781050369
    // 	    6: 763520773587922945
    // 	    7: 793143274059988992
    // 	    8: 793139683412762624
    // 	    9: 1588222783
    // 	    10: 703821370778451968
    // 	Page 2, Number of Ids: 5000
    // 	    0: 15031286
    // 	    1: 2668251246
    // 	    2: 3751659443
    // 	    3: 3324584493
    // 	    4: 2440214809
    // 	    5: 1322335441
    // 	    6: 4439178393
    // 	    7: 4911573711
    // 	    8: 720792880080560128
    // 	    9: 720805087124267008
    // 	    10: 172926330
    // 	Page 3, Number of Ids: 5000
    // 	    0: 93867176
    // 	    1: 2992946183
    // 	    2: 2825296077
    // 	    3: 3784572861
    // 	    4: 2150051321
    // 	    5: 2460881603
    // 	    6: 4128849341
    // 	    7: 2234697931
    // 	    8: 2379418164
    // 	    9: 3425171542
    // 	    10: 325759186
    // 	Page 4, Number of Ids: 5000
    // 	    0: 22793412
    // 	    1: 3347750489
    // 	    2: 316923043
    // 	    3: 2481719196
    // 	    4: 3363591905
    // 	    5: 3238116492
    // 	    6: 58467130
    // 	    7: 3015182362
    // 	    8: 2985342719
    // 	    9: 3095965720
    // 	    10: 17505957
    // 	Page 5, Number of Ids: 5000
    // 	    0: 2541434684
    // 	    1: 140022957
    // 	    2: 134845054
    // 	    3: 772810508
    // 	    4: 16979294
    // 	    5: 2320540225
    // 	    6: 105439442
    // 	    7: 2796744529
    // 	    8: 251128801
    // 	    9: 350229758
    // 	    10: 2683994716
    // 
  }
}