package com.log; import java.io.IOException; import java.net.URLEncoder; 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", URLEncoder.encode (list.get(0).toString(),"utf-8")); 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 { doGet(request, response); } } 接受页面： <%@page import="java.net.URLDecoder"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <% session.setAttribute("uName", "你好"); System.out.print(session.getId()); %> <% //获取cookie对象 Cookie[] getCooks = request.getCookies(); String user = null; if(getCooks.length > 0) { user = getCooks[0].getValue(); user = URLDecoder.decode(user, "utf-8"); } %> <body> <%=session.getAttribute("uName") %>已进入主页！ <%=user%> <button onclick="location.href='main.jsp?u1=<%=user %>'" type="button">跳转传 参</button> </body> </html>