JavaWeb同步学习笔记之四十一、JavaWeb_利用Cookie进行自动登录
JavaWeb_利用Cookie进行自动登录
利用Cookie进行自动登录
- 1.自动登录：不需要填写用户名和密码等信息，可以自动登录到系统。
- 2.具体代码：
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="hello.jsp" method="post">
name:<input name="name" />
<input type="submit" value="Submit" />
</form>
</body>
</html>
hello.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String name = request.getParameter("name");
if(name != null && !name.trim().equals("")){
Cookie cookie = new Cookie("name",name);
cookie.setMaxAge(30);
response.addCookie(cookie);
}else{
Cookie[] cookies = request.getCookies();
if(cookies != null && cookies.length > 0){
for(Cookie cookie: cookies){
String cookieName = cookie.getName();
if("name".equals(cookieName)){
String val = cookie.getValue();
name = val;
}
}
}
}
if(name != null && !name.trim().equals("")){
out.print("Hello，" + name);
}else{
response.sendRedirect("login.jsp");
}
%>
</body>
</html>