Checking Browser Locale

Similar to GzipServlet, this tip uses header information for tuning output 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("<html>");
     out.println("<br>User settings are: "+userLocale);
     out.println("</html>");
                               
     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.

Dmitry Namiot

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