messagefilter.java

个人blog struts_spring_hibernate

package com.weblog.web;

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;
import javax.servlet.http.HttpServletRequest;

public class MessageFilter implements Filter {

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;

		// 从session中获得信息
		Object message = request.getSession().getAttribute("message");

		if (message != null) {
			request.setAttribute("message", message);
			request.getSession().removeAttribute("message");
		}

		// 将request的requestURL存放在request域中
		request.setAttribute("requestURL", request.getRequestURL());
		chain.doFilter(req, res);
	}

	public void init(FilterConfig filterConfig) {
	}

	public void destroy() {
	}
}