1：form

<form action="/show/login.do" method="post">
    <div class="field-wrap">
        <label>Name</label>
        <input  type="text"required autocomplete="off" name="username" value="<%=username%>"/>
    </div>
    <div class="field-wrap">
        <label>Password</label>
        <input type="password"required autocomplete="off" name="password" value="<%=password%>"/>
    </div>
    <p>
        <input type="checkbox" value="" name="ok" >
        <label>Remember Me</label>
    </p>
    <button type="submit" class="button button-block"/>Log In</button>
</form>
 

2: servlet

//接收form傳來的記住我
String remember=req.getParameter("ok");
//建立一個cookie，存放制定值
Cookie nameCookie = new Cookie("username", username);
Cookie passwordCookie = new Cookie("password", password);
//設定失效時間
if (null!=remember && "ok".equals(remember)){
    nameCookie.setMaxAge(7*24*60*60);
    passwordCookie.setMaxAge(7*24*60*60);
}else {
    nameCookie.setMaxAge(0);
    passwordCookie.setMaxAge(0);
}
//將Cookie存放到response中
resp.addCookie(nameCookie);
resp.addCookie(passwordCookie);
 

3：jsp

    <%
        String username = "";
        String password = "";
        Cookie [] cookies = request.getCookies();
        for (int i = 0; i <cookies.length ; i++) {
            if ("username".equals(cookies[i].getName())){
                username=cookies[i].getValue();
            }else if("password".equals(cookies[i].getName())){
                password=cookies[i].getValue();
            }
        }


    %>
 

設定form中的value="<%=username%"   value="<%=password%>"