JSP内置对象的cookie和session实现简单登录界面

创建一个index.jsp页面

<%@ 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>

<body>

<form action="login" method="post">

    用户名:<input type="text" name="uid" /><br>

    密码:<input type="password" name="pwd" /><br>

    <input type="submit" value="登录">

</form>

</body>

</html>

创建一个main.jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

    pageEncoding="ISO-8859-1"%>

<!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=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

<%--

if(session.getAttribute("user")==null){

    response.sendRedirect("index.jsp");

}

--%>

<%

Cookie[] cc = request.getCookies();

boolean has = false;

for(Cookie c:cc){

    if(c.getName().equals("user")){

        has=true;

    }

}

if(has==false){

    response.sendRedirect("index.jsp");

}

%>

welcome:<%=session.getAttribute("user") %>

<%

for(Cookie c:cc){

    if(c.getName().equals("user")){

        out.print(c.getValue());

    }

}

%>

</body>

</html>

创建一个servlet界面，名为Login

package com.ceshi;

import java.io.IOException;

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 Login

 */

@WebServlet("/login")

public class Login extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public Login() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

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

        // TODO Auto-generated method stub

        //response.getWriter().append("Served at: ").append(request.getContextPath());

        String uid = request.getParameter("uid");

        String pwd = request.getParameter("pwd");

        //HttpSession session= request.getSession();

        //session.setAttribute("user",uid);

        Cookie c = new Cookie("user", uid);

        response.addCookie(c);

        response.sendRedirect("main.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);

    }

}

显示如下：

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JSP内置对象的cookie和session实现简单登录界面

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