ECOM/HelloFilter.java

package ecom.web;

import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.*;

@WebFilter(urlPatterns={"/hello*"},
        initParams={ @WebInitParam(name="simpleParam", value="paramValue") })
        public class TestFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        StringWriter sw = new StringWriter();
        PrintWriter writer = new PrintWriter(sw);

        writer.println("===============");
        writer.println("Filter intercepted!");
        writer.println("===============");

        // Log the resulting string
        writer.flush();
        filterConfig.getServletContext().
        log(sw.getBuffer().toString());

	System.out.println(sw.getBuffer().toString());

        chain.doFilter(request, response);

    }

    private FilterConfig filterConfig = null;
    public void init(FilterConfig filterConfig) 
    throws ServletException {
        this.filterConfig = filterConfig;
    }

    @Override
    public void destroy() {    }
}