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<