java code for Parameter Filter

import javax.servlet.*;
import javax.servlet.http.*;

import java.util.Map;
import java.util.Iterator;
import java.util.Map.Entry;

public class ParamSnoop implements Filter {

private FilterConfig config;

/** Creates new ParamSnoop */
public ParamSnoop() {
}

public void init(FilterConfig filterConfig) throws ServletException{

this.config = filterConfig;

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws java.io.IOException, ServletException {


Map paramMap = request.getParameterMap();
ServletContext context = config.getServletContext();
/* use the ServletContext.log method to log
param names/values */
context.log("doFilter called in: " + config.getFilterName() +
" on " + (new java.util.Date()));
context.log("Snooping the parameters in request: " +
((HttpServletRequest) request).getRequestURI());

Iterator iter = paramMap.entrySet().iterator();
while (iter.hasNext()){

Map.Entry me = (Map.Entry) iter.next();
context.log((String)me.getKey() + ": " + ((String[]) me.getValue())[0]);
}

chain.doFilter(request,response);

}

public void destroy(){
/*called before the Filter instance is removed
from service by the web container*/
}
}
import javax.servlet.*;
import javax.servlet.http.*;

import java.util.Map;
import java.util.Iterator;
import java.util.Map.Entry;

public class ParamSnoop implements Filter {

private FilterConfig config;

/** Creates new ParamSnoop */
public ParamSnoop() {
}

public void init(FilterConfig filterConfig) throws ServletException{

this.config = filterConfig;

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws java.io.IOException, ServletException {


Map paramMap = request.getParameterMap();
ServletContext context = config.getServletContext();
/* use the ServletContext.log method to log
param names/values */
context.log("doFilter called in: " + config.getFilterName() +
" on " + (new java.util.Date()));
context.log("Snooping the parameters in request: " +
((HttpServletRequest) request).getRequestURI());

Iterator iter = paramMap.entrySet().iterator();
while (iter.hasNext()){

Map.Entry me = (Map.Entry) iter.next();
context.log((String)me.getKey() + ": " + ((String[]) me.getValue())[0]);
}

chain.doFilter(request,response);

}

public void destroy(){
/*called before the Filter instance is removed
from service by the web container*/
}
}