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Saturday, 20 April 2013

Currency Conversion - Google Calculator API integration in ADF using GSON

First ,thanks to this post .
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 = "";  
         /**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*/  
         Reader reader = new InputStreamReader(url.openStream(), charset);  
         Result result = new Gson().fromJson(reader, Result.class);  
         // Get the value without the term currency.  
         String amount = result.getRhs().split("\\s+")[0];  

  • 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

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