リクエストパラメーターを確認するInterceptor

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

import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class RequestParameterInterceptor extends AbstractInterceptor {

    Logger logger = Logger.getLogger(getClass());

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        Map<String, Object> map = ServletActionContext.getContext().getParameters();
        logger.debug("---- request parameter start ----");
        for (Entry<String, Object> entry : map.entrySet()) {
            logger.debug(String.format(entry.getKey(), entry.getValue()));
        }
        String ret = invocation.invoke();
        for (Entry<String, Object> entry : map.entrySet()) {
            logger.debug(String.format(entry.getKey(), entry.getValue()));
        }
        logger.debug("---- request parameter end ----");
        return ret;
    }

}