import com.google.gson.Gson;

public class Shortener {
    private static final String URL_GOOGL_SERVICE = “https://www.googleapis.com/urlshortener/v1/url”;
   
    private static final Gson gson = new Gson();
   
    public static String shorten(String longUrl) {
        String result = new String();
        GsonGooGl gsonGooGl = new GsonGooGl(longUrl);
       
        try {
            URL url = new URL(URL_GOOGL_SERVICE);
           
            URLConnection   urlConn = url.openConnection();
            urlConn.setDoInput (true);                                                            // Let the run-time system (RTS) know that we want input.
            urlConn.setDoOutput (true);                                                            // Let the RTS know that we want to do output.
            urlConn.setUseCaches (false);                                                        // No caching, we want the real thing.
            urlConn.setRequestProperty(“Content-Type”, “application/json”);                        // Specify the content type.
           
           
            DataOutputStream printout = new DataOutputStream (urlConn.getOutputStream ());        // Send POST output.
            String content = gson.toJson(gsonGooGl);
            printout.writeBytes (content);
            printout.flush ();
            printout.close ();
           
            DataInputStream input = new DataInputStream (urlConn.getInputStream ());            // Get response data.
           
            Scanner sc = new Scanner(input);
            while(sc.hasNext()) {
                result += sc.next();
            }
           
            GooGlResult gooGlResult = gson.fromJson(result, GooGlResult.class);
           
            return gooGlResult.getId();
        } catch (Exception ex) {
           System.out.println(ex);
           return null;
        }
    }
}

class GsonGooGl {
    public GsonGooGl(){}
    public GsonGooGl(String longUrl){
        this.longUrl = longUrl;
    }
   
    private String longUrl;

    public String getLongUrl() {
        return longUrl;
    }
    public void setLongUrl(String longUrl) {
        this.longUrl = longUrl;
    }
   
   
}

class GooGlResult {
    public GooGlResult(){}
   
    private String kind;
    private String id;
    private String longUrl;
   
    public String getKind() {
        return kind;
    }
    public void setKind(String kind) {
        this.kind = kind;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getLongUrl() {
        return longUrl;
    }
    public void setLongUrl(String longUrl) {
        this.longUrl = longUrl;
    }
   
   
}

To use:

System.out.println(Shortener.shorten(“http://goorkers.com”));