JAVA EE之Cookie记住我

灰太狼 2022-05-10 01:46 168阅读 0赞

### 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="ok" name="ok" >
            <label>Remember Me</label>
        </p>
        <button type="submit" class="button button-block"/>Log In</button>
    </form>

### 2: servlet ###

//接收form传来的记住我
    String remember=req.getParameter("ok");
    //创建一个cookie，存放制定值
    Cookie nameCookie = new Cookie("username", username);
    Cookie passwordCookie = new Cookie("password", password);
    //设置失效时间
    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);
    }
    //将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();
                }
            }
    
    
        %>

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

![70][]

[70]: /images/20220510/04ad39bb930c4ce1b6c9f5dd20509f96.png