UrlRedirectInterceptor.java

UrlRedirectInterceptor.java

import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by ivanursul on 5/29/15.
 */
public class UrlRedirectInterceptor {

    public String getRedirectedUrl(String url) throws Exception {
        HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
        con.setInstanceFollowRedirects(false);
        con.connect();
        con.getInputStream();

        if (con.getResponseCode() == HttpURLConnection.HTTP_MOVED_PERM || con.getResponseCode() == HttpURLConnection.HTTP_MOVED_TEMP) {
            String redirectUrl = con.getHeaderField("Location");
            return getRedirectedUrl(redirectUrl);
        }
        
        return url;
    }

    public static void main(String[] args) throws Exception {
        UrlRedirectInterceptor interceptor = new UrlRedirectInterceptor();

        System.out.println(interceptor.getRedirectedUrl("http://spreadsheets.google.com/pub?key=tFOn62dEO9QCyIKK6kgSYRQ"));

    }

}