Similar to GzipServlet, this tip uses header information for tuningoutput of our servlets; this one allows you to check the header ‘Accept-Language’. If your user has set some language preferences within her own browser, you can read these settings through this header:

 import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class BrowserLocaleServlet extends HttpServlet {                              public void doGet 
(HttpServletRequest req,HttpServletResponse res)                         throws ServletException, IOException    {       doPost(req,res);    }    public void doPost (HttpServletRequest req, 
HttpServletResponse res)                         throws ServletException, IOException    {                              String userLocale=req.getHeader("Accept-Language");          PrintWriter out=res.getWriter();     res.setContentType("text/html");                                   out.println("");     out.println("
User settings are: "+userLocale);     out.println("");                                    out.flush();     out.close();    }      }  

For example, in my case, the output is ‘User settings are: en’. Depending on that settings, you can format, for example, your date before output. You should note that you have to see the HTTP manual for a full description of coding issues in this string.