Currency Conversion - Google Calculator API integration in ADF using GSON

First ,thanks to this post http://blog.caplin.com/2011/01/06/simple-currency-conversion-using-google-calculator-and-java/ .
I was looking for any API, webservice for retrieving live currency fluctuation, finally i came to this solution that integrates Google Calculator with Java to calculate currenct currency rates and i have integrated this with my Oracle ADF Application

I have created an application using bounded taskflow -

• Created a .jsff page with two input text , to get value of Base and Term currency and a button, on which rate is calculated

 

•  In order to use Goolge Calculator, we have to use GSON (open source java library (API) to convert JSON objects in POJO (pure java object)) 
• To access GSON library we have to add google-gson-stream-2.2.1.jar in our project library - Download Gson Jar
• this trick uses google calculator for calculating converion rate, as we all know Google Calculator is very smart, whenever we search like 1 USD ,it always shows results according to locale

As 1 USD searched in India-

As 1 USD searched in UK- 

• this is also hidden benefit for our application , we can pass locale to get changed values also- now see what is the code that get values from Google Calculator



   public void calculateFluctuationButton(ActionEvent actionEvent) throws Exception {  
     String google = "http://www.google.com/ig/calculator?en=hi&q=";  
     /**Get values from page component binding*/  
     String baseCurrency = baseCurrencyBind.getValue().toString();  
     String termCurrency = termCurrencyBind.getValue().toString();  
     String charset = "UTF-8";  
     /**Replace url using your values-*/  
     URL url = new URL(google + baseCurrency + "%3D%3F" + termCurrency);  
     /**Go to url directly to see you result*/  
     System.out.println(url);  
     Reader reader = new InputStreamReader(url.openStream(), charset);  
     Result result = new Gson().fromJson(reader, Result.class);  
     System.out.println(result);  
     // Get the value without the term currency.  
     String amount = result.getRhs().split("\\s+")[0];  
     System.out.println(amount);  
     resultBind.setValue(amount);  
   }  



• See in code i have passed currency notation from page (INR,USD ) to bean and passed it in url of google calculator and this url returns results

Download Complete Application -Sample ADF Application