JavaWeb——HttpSession常用方法示例

谁借莪１个温暖的怀抱￠ 2023-08-17 17:40 124阅读 0赞

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()**

![1642540-20190710161730164-1777819270.png][]![1642540-20190710161746717-2062535421.png][]![1642540-20190710161814343-1065343887.png][]

<%--
 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()%>
 
 IsNew:<%= session.isNew()%>
 
 MaxInactive:<%=session.getMaxInactiveInterval()%>
 
 CreateTime:<%= session.getCreationTime()%>
 
 LastAssessTime:<%= session.getLastAccessedTime()%>
 
 <%
 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()%>
 
 IsNew:<%= session.isNew()%>
 
 MaxInactive:<%=session.getMaxInactiveInterval()%>
 
 CreateTime:<%= session.getCreationTime()%>
 
 LastAssessTime:<%= session.getLastAccessedTime()%>
 
 Hello:<%= request.getParameter("username")%>
 
 <%
 session.setAttribute("username",request.getParameter("username"));
 %>
 <a href="login.jsp">重新登录</a>
 
 <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()%>
 
 IsNew:<%= session.isNew()%>
 
 MaxInactive:<%=session.getMaxInactiveInterval()%>
 
 CreateTime:<%= session.getCreationTime()%>
 
 LastAssessTime:<%= session.getLastAccessedTime()%>
 
 BYE:<%= session.getAttribute("username")%>
 
 <a href="login.jsp">重新登录</a>
 <%
 session.invalidate();
 %>
 </body>
 </html>

转载于:https://www.cnblogs.com/yangHS/p/11164726.html

[1642540-20190710161730164-1777819270.png]: https://img2018.cnblogs.com/blog/1642540/201907/1642540-20190710161730164-1777819270.png
[1642540-20190710161746717-2062535421.png]: https://img2018.cnblogs.com/blog/1642540/201907/1642540-20190710161746717-2062535421.png
[1642540-20190710161814343-1065343887.png]: /images/20230808/78c77aeb218c4852be47493482c52c66.png