sessionfilter.java

利用servlet写的用户注册登陆

package com.tarena.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SessionFilter extends HttpFilter {

	@Override
	public void doFilter(HttpServletRequest request,
			HttpServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpSession session = request.getSession(true);
		String path = request.getServletPath();
		path = path.substring(0, path.indexOf("."));

		if (session.getAttribute("userInfo") != null && !path.equals("/login")
				&& !path.equals("/register")) {
			response.sendRedirect("/serv-guides/login.html");
			return;
		} else {
			chain.doFilter(request, response);
		}
	}

}