package framework.base;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 * 有选择的将 request 中的parameter 放在attribute里
 * 
 * @company 北京贝思科技术有限公司
 * @author liuyajun, 8384503@qq.com
 * @date 2016年2月18日
 * @time 上午11:17:34
 */
public class RequestParameterInterceptor implements HandlerInterceptor {

	@Override
	public void afterCompletion(HttpServletRequest req, HttpServletResponse res, 
			Object obj, Exception e)
			throws Exception {
	}

	@Override
	public void postHandle(HttpServletRequest req, HttpServletResponse res, 
			Object obj, ModelAndView mv)
			throws Exception {
		Enumeration<String> en = req.getParameterNames();
		while(en.hasMoreElements()){
			String name = en.nextElement();
			if(req.getAttribute(name) !=null){
				//已经存在，不处理
				continue;
			}
			req.setAttribute(name, req.getParameter(name));
		}
	}

	@Override
	public boolean preHandle(HttpServletRequest req, HttpServletResponse res, 
			Object obj) throws Exception {
		return true;
	}

}