把每一个Session用户存入List中

package com.xinlang.ser;

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

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

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

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
			//创建集合对象	
			List lt = new ArrayList();
			//创建application对象
			ServletContext application = this.getServletContext();
			//创建session对象
			HttpSession session = request.getSession();
			if(application.getAttribute("lt")==null){
				//将第一个访问的对象存入
				lt.add(request.getParameter("name"));
				application.setAttribute("lt",lt);
    		}
			//判断是否有下一个session
			else if(request.getSession().isNew()){
				lt = (List) application.getAttribute("lt");
				//添加入集合中
				lt.add(request.getParameter("name"));
				application.setAttribute("lt", lt);
			}
			//存入最后得到的集合
			lt = (List) application.getAttribute("lt");
			System.out.println(lt.toString());
			//获取页面传来的用户名
			String s = request.getParameter("name");
			//将名字存入session中
			request.getSession().setAttribute("name",s);
			
			request.getRequestDispatcher("liaotian.jsp").forward(request, response);
			
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
	}

}

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