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JavaWeb uses Cookie simulation to implement automatic login function (no username and password required)

Jan 18, 2017 pm 02:17 PM

JavaWeb uses Cookie simulation to implement automatic login function (no username and password required)

It contains two jsp files, namely login.jsp and index.jsp

The code is as follows:

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录界面</title>
</head>
<body>
<form action="index.jsp" method="post">
用户名:<input type="text" name="name"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

Copy after login

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>欢迎您</title>
</head>
<body>
<%
String name = request.getParameter("name");
if(name != null && !name.trim().equals("")){
Cookie cookie = new Cookie("name",name);
cookie.setMaxAge(30); //设置cookie有效期为30s
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{//否则重定向到登录界面
response.sendRedirect("login.jsp");
}
%>
</body>
</html>

Copy after login

The above is the JavaWeb use of cookies introduced by the editor I simulate the automatic login function. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website!

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