OAuth Request token in Twitter API JAVA JSP Example

Here is the code snippet which will tell you how to get request token in twitter OAuth API by JAVA. We create a JSP file say oauth.jsp . All you need to import few jars like -

• Apache HttpClient
• OAuth signepost library

And here is the JSP file

<%@ page import="java.io.BufferedReader"%>
<%@ page import="java.io.InputStreamReader"%>
<%@ page import="java.net.URLEncoder"%>
<%@ page import="java.net.*"%>


<%@ page import="oauth.signpost.OAuth"%>
<%@ page import="oauth.signpost.OAuthConsumer"%>
<%@ page import="oauth.signpost.OAuthProvider"%>
<%@ page import="oauth.signpost.basic.DefaultOAuthProvider"%>
<%@ page import="oauth.signpost.commonshttp.CommonsHttpOAuthConsumer"%>


<%@ page import="org.apache.http.HttpResponse"%>
<%@ page import="org.apache.http.client.HttpClient"%>
<%@ page import="org.apache.http.client.methods.HttpPost"%>
<%@ page import="org.apache.http.entity.StringEntity"%>
<%@ page import="org.apache.http.impl.client.DefaultHttpClient"%>

<%
OAuthConsumer consumer = new CommonsHttpOAuthConsumer

 ("<consumer key>","<consumer secret>");

OAuthProvider provider = new DefaultOAuthProvider(
                 "http://twitter.com/oauth/request_token",
                 "http://twitter.com/oauth/access_token", 
                 "http://twitter.com/oauth/authorize");



// Set your callback URL here
String authUrl = provider.retrieveRequestToken
           (consumer,"http://localhost:8080/twitter/callback.jsp");

session.setAttribute("consumer",consumer);
session.setAttribute("provider",provider);

out.println("<a href='"+authUrl+"'>Connect</a>");

%>