Recipe 24.9 Formatting Currencies in a Servlet
Problem
You want to format a currency value
according to the request's locale.
Solution
Use the java.text.NumberFormat class.
Discussion
The NumberFormat class can format a number, such
as a long or double type, as a
percentage. This class has a static
getCurrencyInstance(
) method. This method can take a
java.util.Locale object as a parameter, to display
the currency according to the user's language
setting.
Example 24-10 is a servlet that demonstrates the
locale-sensitive display of a currency, by showing both the currency
amount and the locale language and country code.
Example 24-10. Formatting a number as a percentage in a servlet
package com.jspservletcookbook;
import java.text.NumberFormat;
import java.util.Locale;
import java.util.ResourceBundle;
import javax.servlet.*;
import javax.servlet.http.*;
public class CurrLocaleServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
//Get the client's Locale
Locale locale = request.getLocale( );
ResourceBundle bundle = ResourceBundle.getBundle(
"i18n.WelcomeBundle",locale);
String welcome = bundle.getString("Welcome");
NumberFormat nft = NumberFormat.getCurrencyInstance(locale);
String formattedCurr = nft.format(1000000);
//Display the locale
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter( );
out.println("<html><head><title>"+welcome+"</title></head><body>");
out.println("<h2>"+bundle.getString("Hello") + " " +
bundle.getString("and") + " " +
welcome+"</h2>");
out.println("Locale: ");
out.println( locale.getLanguage( )+"_"+locale.getCountry( ) );
out.println("<br /><br />");
out.println(formattedCurr);
out.println("</body></html>");
} //doGet
//implement doPost( ) to call doGet( )...
}
The NumberFormat
class'
format( ) method returns a
String that represents the formatted currency.
Figure 24-6 shows the servlet's
output when requested by a browser where the user has set the
language setting to the locale
"en_GB" (English language, Great
Britain).
See Also
The Javadoc for the NumberFormat class:
http://java.sun.com/j2se/1.4.1/docs/api/java/text/NumberFormat.html;
Recipe 24.10 on formatting currencies in a
JSP.
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