package com.kaka.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LogoutServlet extends HttpServlet{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	

	@SuppressWarnings("unchecked")
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		HttpSession session = req.getSession();
		String userName = (String) session.getAttribute("username");
		session.invalidate();//session失效
		ServletContext application = session.getServletContext();
		List<String> userList = (List<String>) application.getAttribute("userlist");
		userList.remove(userName);
		resp.sendRedirect("result.jsp");
		
		
	}
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		
		doPost(req, resp);
		
	}
}