index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
String username = "", password = "";
String remember1 = null, remember2 = null;
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
if (cookie.getName().equals("loginname")) {
username = cookie.getValue();
}
if (cookie.getName().equals("loginpwd")) {
password = cookie.getValue();
}
if (cookie.getName().equals("remember1")) {
remember1 = cookie.getValue();
}
if (cookie.getName().equals("remember2")) {
remember2 = cookie.getValue();
}
}
}
for (Cookie cookie : cookies) {
response.addCookie(cookie);//服务端给客户端的cookie
}
%>
<%--先检查一遍cookie，如果有cookie，则添加到浏览器里面。--%>
<%--然后表单的作用就是让用户填写账号密码，提交了之后页面跳转到login.jsp里面--%>
<form method="post" action="login.jsp">
<table align="center">
<tr>
<td>用户名称:</td>
<td><input type="text" name="username" value="<%=username%>" id="username"></td>
</tr>
<tr>
<td align="left">密码:</td>
<td><input type="password" name="pwd" value="<%=password%>" id="pwd"></td>
</tr>
<tr>
<td align="right"><input type="checkbox" name="remember1" <%=remember1%>></td>
<td>自动记录名称</td>
</tr>
<tr>
<td align="right"><input type="checkbox" name="remember2" <%=remember2%>></td>
<td>自动记录密码</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="登录">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</body>
</html>
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
// 跳转过来之后，检查账号密码是否正确，如果正确了，就显示登陆成功，返回cookie到浏览器那里，
// 并且显示一个跳转的链接，如果密码不对就重新跳转回到index.jsp
String username = request.getParameter("username");//获取用户名
String password = request.getParameter("pwd");//获取密码
String remember1 = request.getParameter("remember1");//得到复选框☑️
String remember2 = request.getParameter("remember2");//得到复选框☑️
if (username.equals("abc") && password.equals("123")) {
out.println("登录成功<br/>");
if (remember1 != null && remember1.equals("on")) { // 点了✅就是on，没点✅就是null
//rem1必须点击了之后才能不是null
Cookie mycookie1 = new Cookie("loginname", username);
Cookie mycookie3 = new Cookie("remember1", "checked");
response.addCookie(mycookie1);
response.addCookie(mycookie3);
}
if (remember2 != null && remember2.equals("on")) {
Cookie mycookie2 = new Cookie("loginpwd", password);
Cookie mycookie4 = new Cookie("remember2", "checked");
response.addCookie(mycookie2);
response.addCookie(mycookie4);
}
out.println("<a href=index.jsp>重新登录</a>");
} else {
request.getRequestDispatcher("index.jsp").forward(request, response);
}
%>
</body>
</html>