Free Online Programming Tutorials

package examples.filters;

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;

/**
* @version 1.0
* @author
*/

public class HelloWorldFilter implements Filter

{
/**
* @see javax.servlet.Filter#void ()
*/
public void destroy() {

}

/**
* @see javax.servlet.Filter #void (javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
*/

public void doFilter(
ServletRequest req,
ServletResponse resp,
FilterChain chain)
throws ServletException, IOException {
System.out.println(”Entering Filter”);
req.setAttribute(”hello”,”HelloWorld”);
chain.doFilter(req, resp);
System.out.println(”Exiting Filter”);

}

/**
* Method init.
* @param config
* @throws javax.servlet.ServletException
*/
public void init(FilterConfig config) throws ServletException {

}

}