How to Import Gmail Contacts from Gmail account using Oauth 2

Question

I am trying to import gmail contacts into my java web application. I followed the document https://developers.google.com/identity/protocols/OAuth2WebServer?csw=1#callinganapi

I am able to authenticate gmail user but when i click accept, when asked for manage your contacts i get error:

java.net.ConnectException: Connection timed out

i am calling this URL:

https://accounts.google.com/o/oauth2/auth?client_id=XXXXXXX&redirect_uri=http://XXXX/call.jsp&scope=https://www.google.com/m8/feeds/&response_type=code

and when i land on call.jsp of my web application it shows error on line:

client.executeMethod(post);

Here is my code on call.jsp:

<%@page import="org.jsoup.select.Elements"%>
<%@page import="org.jsoup.Jsoup"%>
<%@page import="java.util.ArrayList"%>
<%@page import="org.jsoup.nodes.Document"%>
<%@page import="org.apache.commons.httpclient.methods.GetMethod"%>
<%@page import="org.json.JSONObject"%>
<%@page import="java.io.InputStreamReader"%>
<%@page import="java.io.BufferedReader"%>
<%@page import="org.apache.commons.httpclient.NameValuePair"%>
<%@page import="org.apache.commons.httpclient.methods.PostMethod"%>
<%@page import="org.apache.commons.httpclient.HttpClient"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
</head>
<body>
    <%

         String code = request.getParameter("code");
      System.out.println(code);
      HttpClient client = new HttpClient();
      PostMethod post = new PostMethod("https://accounts.google.com/o/oauth2/token");
      post.addRequestHeader("Host", "accounts.google.com");
      post.addRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      NameValuePair[] data = {
                new NameValuePair("code", code),
                new NameValuePair("client_id", "XXXXX"),
                new NameValuePair("client_secret", "XXXXX"),
                new NameValuePair("redirect_uri", "http://XXX/call.jsp"),
                new NameValuePair("grant_type", "authorization_code")
      };
      post.setRequestBody(data);
            client.executeMethod(post);
            BufferedReader b = new BufferedReader(new InputStreamReader(post.getResponseBodyAsStream()));
             StringBuilder sb = new StringBuilder();
            String str = null;
            while ((str = b.readLine()) != null) {
                sb.append(str);
            }
            JSONObject access_token = new JSONObject(sb.toString());
            GetMethod get = new GetMethod("https://www.google.com/m8/feeds/contacts/default/full?max-results=1000&access_token=" + access_token.getString("access_token"));
                client.executeMethod(get);
                b = new BufferedReader(new InputStreamReader(get.getResponseBodyAsStream()));
                sb = new StringBuilder();
                str = null;
                while ((str = b.readLine()) != null) {
                    sb.append(str);
                }
                Document doc = null;
             //Here you will get contacts in xml format.  
             out.print(sb.toString());
             // Using Jsoup you can read data from xml



    %>
</body>
</html>

Please suggest, what i am doing wrong?

score 1 · Answer 1 · answered May 20 '15 at 19:36

If I correctly understood, you are able to get the authorization code, but no the token.

Your post object is using the URL value https://accounts.google.com/o/oauth2/token, but according the documentation you've linked, to fetch the token, you must use https://googleapis.com/oauth2/v3/token

Use Libraries

Instead of try to re-invent the wheel, why not use libraries like gdata-java-client or CloudSponge?

They encapsulate all details for you, and have several samples.

score 0 · Answer 2 · edited May 23 '17 at 11:43

First of all, it's not a good idea to inline Java code in the JSP page. See the answer to this question to understand why.

As far as I can tell, you are using the same JSP to make the OAuth request and handle the callback as a redirect URI. I am guessing that you were trying to follow this tutorial. As you can see, that tutorial uses the Struts framework to separate the controller logic (making the OAuth request with a Struts Action) from view logic (displaying the contacts list).

Try to follow the tutorial in its entirety, and then make customizations and adjustments according to your needs.

How to Import Gmail Contacts from Gmail account using Oauth 2

2 Answers2

Use Libraries