WEB——Cookie之記住用戶名

原創

panpan_1994

2020-02-21 23:31

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'login.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
  <form action="/day-cookie/HServlet"  >
        用戶名:<input type="text" name="name" value="${cookie.remember.value}" />
        <font color="red">${requestScope.error}</font>
        <br>
        密碼:<input type="text" name="password" /><br>
        <input type="checkbox" name="remember" value="yes" ${cookie.remember==null?"":"checked=checked"} />記住用戶名<br>
        <input type="submit" value="登錄" />
    </form>
  </body>
</html>

HServlet.java

public class HServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("name");
        if (name == null || "".equals(name.trim())) {
            request.setAttribute("error", "請輸入用戶名");
            request.getRequestDispatcher("/remember/login.jsp").forward(
                    request, response);
            return;
        }
        Cookie cookie = new Cookie("remember", name);
        String remember = request.getParameter("remember");
        if ("yes".equals(remember)) {
            cookie.setMaxAge(60 * 60 * 24 * 7 * 2);
        } else {
            cookie.setMaxAge(0);
        }
        response.addCookie(cookie);
        response.sendRedirect("/day-cookie/index.jsp");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doGet(req, resp);

    }

}