Creating a Custom Servlet Filter
This free, multimedia tutorial shows you how to use IBM's Rational Application Developer (IRAD) 6.0 to create
a Servlet Filter. The web.xml file is then edited to apply the filter to the CountrySnooperServlet, to ensure that
only true, patriotic Americans actually get to see the output of the CountrySnooperServlet. We also add in a little
TimeStamping or Time Logging functionality, but that's neither here nor there.
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package com.examscam.web.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class AmericanFilter implements Filter {
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
String language = request.getLocale().getDisplayLanguage();
if (language!="Spanish") {
response.getWriter().print("Only people speaking American can view this Servlet.");
}
else{
chain.doFilter(request, response);
}
System.out.println("Time after the servlet is run: " + System.currentTimeMillis());
}
public void destroy() {
// TODO Auto-generated method stub
}
}
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