session会话

jsp会话篇session：

package com.log;

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

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

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/LoginServlet.do")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       //首先设置响应和请求页面的编码格式：
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html charset='utf-8'");
       //获取表单控件的数据
        Enumeration<String> nameEnu = request.getParameterNames();
        //创建list对象
        List<Object> list = new ArrayList<>();
        while(nameEnu.hasMoreElements())
        {
               list.add(request.getParameter(nameEnu.nextElement()));
        }
        //把数据放在session对象
        HttpSession session = request.getSession();
        if(list.size()>0){
        session.setAttribute("uName", list.get(0));
        }

        //第二种方式，通过Cookie保存用户信息
        Cookie cook1 = new Cookie("userName", list.get(0).toString());
        cook1.setMaxAge(3*3600);
        response.addCookie(cook1);

//        request.getRequestDispatcher("/main.jsp").forward(request, response);
        response.sendRedirect(request.getContextPath()+"/welcome.jsp");

    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}