登录时记住账号密码功能示例代码

登录JSP页面

<%
        request.setCharacterEncoding("utf-8");
        String username = "";
        String password = "";
        Cookie[] cookies =  request.getCookies();
        if(cookies!=null && cookies.length>0){
            for(Cookie c : cookies){
                System.out.println(c.getName()+":"+URLDecoder.decode(c.getValue(), "utf-8"));
                if(c.getName().equals("username")){
                    username =URLDecoder.decode(c.getValue(),"utf-8") ;
                }
                if(c.getName().equals("pwd")){
                    password = c.getValue();
                }
            }
        }
    
     %>
    <form action="login.jsp" method="post">
        <input name="action" value="login" type="hidden">
        <input name="username" placeholder="用户名" value="<%=username %>" required="" type="text">
        <hr class="hr15">
        <input name="password" placeholder="密码" value="<%=password %>" required="" type="password">
        <hr class="hr15">
        <input type="checkbox" name="jizhu" value="jizhu" checked="checked">
        十天内记住我的登录状态
        <hr class="hr15">
        <input value="登录" style="100%;" type="submit">
        <hr class="hr20">
        <!-- 帮助 <a onClick="alert('请联系管理员')">忘记密码</a> -->
    </form>

处理登录信息的JSP页面

<% request.setCharacterEncoding("utf-8"); %>
<jsp:useBean id="user" class="com.po.User" scope="page"></jsp:useBean>
<jsp:useBean id="userDao" class="com.dao.UserDao" scope="page"></jsp:useBean>
<jsp:setProperty property="*" name="user"/>
<%
    
    String[] jizhu = request.getParameterValues("jizhu");
    if(jizhu!=null && jizhu.length>0){
        Cookie nameCookie = new Cookie("username",URLEncoder.encode(user.getUsername(), "utf-8") );
        Cookie pwdCookie = new Cookie("pwd",user.getPassword());
        nameCookie.setMaxAge(60);
        pwdCookie.setMaxAge(60);
        response.addCookie(nameCookie);
        response.addCookie(pwdCookie);
    }else{
        Cookie[] cookies =  request.getCookies();
        if(cookies!=null && cookies.length>0){
            for(Cookie c : cookies){
                if(c.getName().equals("username")||c.getName().equals("pwd")){
                    c.setMaxAge(0);
                    response.addCookie(c);
                }
            }
        }
    }

    if(userDao.login(user)){
        session.setAttribute("name", user.getUsername());
        request.getRequestDispatcher("main.jsp").forward(request, response);
    }else{
        response.sendRedirect("error.jsp");
    }


%>