LogoutServlet.java

package cn.edu.njupt.allgo.service.action;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import cn.edu.njupt.allgo.service.utils.CommonUtil;
import cn.edu.njupt.allgo.service.utils.ServletHelper;

/**
 * Servlet implementation class LogOffServlet
 */
@WebServlet("/logout")
public class LogoutServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    public LogoutServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request , response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ServletHelper helper = new ServletHelper(request,response);

		@SuppressWarnings("unchecked")
		Map<Integer, HttpSession> loginUserMap = (Map<Integer, HttpSession>) this.getServletContext().getAttribute("loginUserMap");
		loginUserMap.remove(helper.session().getAttribute("uid"));
		
		helper.session().invalidate();

		helper.put("response", "logout");
		helper.send();
	}

}