JavaWeb——HttpSession常用方法示例
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HttpSession接口中方法
getId()
getCreationTime()
getLastAccessedTime()
setMaxInactiveInterval()
getMaxInactiveInterval()
isNew():如果客户端请求消息中返回了一个与Servlet程序当前获得的HttpSession对象的会话标识号相同，则认为这个HttpSession对象不是新建的
invalidate()
getServletContext()
setAttribute()
getAttribute()
removeAttribute()
getAttributeNames()
login.jsp
<%-- Created by IntelliJ IDEA. User: dell Date: 2019/7/10 Time: 15:52 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> SessionID:<%= session.getId()%> <br><br> IsNew:<%= session.isNew()%> <br><br> MaxInactive:<%=session.getMaxInactiveInterval()%> <br><br> CreateTime:<%= session.getCreationTime()%> <br><br> LastAssessTime:<%= session.getLastAccessedTime()%> <br><br> <% Object username = session.getAttribute("username"); if (username ==null) username =""; %> <body> <form action="hello.jsp" method="post"> username: <input type="text" name="username" value="<%=username%>"> <input type="submit" value="Submit"> </form> </body> </html>
hello.jsp
<%--
Created by IntelliJ IDEA.
User: dell
Date: 2019/7/10
Time: 15:56
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
SessionID:<%= session.getId()%>
<br><br>
IsNew:<%= session.isNew()%>
<br><br>
MaxInactive:<%=session.getMaxInactiveInterval()%>
<br><br>
CreateTime:<%= session.getCreationTime()%>
<br><br>
LastAssessTime:<%= session.getLastAccessedTime()%>
<br><br>
Hello:<%= request.getParameter("username")%>
<br><br>
<%
session.setAttribute("username",request.getParameter("username"));
%>
<a href="login.jsp">重新登录</a>
<br><br><br>
<a href="logout.jsp">注销</a>
</body>
</html>
logout.jsp
<%--
Created by IntelliJ IDEA.
User: dell
Date: 2019/7/10
Time: 16:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
SessionID:<%= session.getId()%>
<br><br>
IsNew:<%= session.isNew()%>
<br><br>
MaxInactive:<%=session.getMaxInactiveInterval()%>
<br><br>
CreateTime:<%= session.getCreationTime()%>
<br><br>
LastAssessTime:<%= session.getLastAccessedTime()%>
<br><br>
BYE:<%= session.getAttribute("username")%>
<br><br>
<a href="login.jsp">重新登录</a>
<%
session.invalidate();
%>
</body>
</html>
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