RequestParameterLoggingFilter

RequestParameterLoggingFilter.java

package org.jasig.portal.web;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
import java.util.Map;

/**
 * Created by apetro on 8/20/14.
 */
public class RequestParameterLoggingFilter
    implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        Map parameterMap = request.getParameterMap();

        for (Object entryObject : parameterMap.entrySet()) {

            Map.Entry entry = (Map.Entry) entryObject;
            String paramName = (String) entry.getKey();
            String[] values = (String[]) entry.getValue();

            StringBuilder valuesAsString = new StringBuilder();

            for (String value : values) {
                valuesAsString.append(value);
                valuesAsString.append(", ");
            }

            System.out.println("Request parameter named [" + paramName + "] had values [" + valuesAsString.toString() +
                    "]");
        }

        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {

    }
}