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JavaWeb uses Cookie simulation to implement automatic login function (no username and password required)
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:
login.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>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>
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>
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!
For more articles related to JavaWeb using Cookie simulation to implement automatic login function (no user name and password required), please pay attention to the PHP Chinese website!
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