这是我的 web.xml 文件，它位于WEB-INF/lib。它指定会话超时时间为 1 分钟，但用户活动 1 分钟后不会超时。
Web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>1</session-timeout>
</session-config>
</web-app>
我用了这条线session.getMaxInactiveInterval()在我的 jsp 文件中，它输出1800（30分钟） 。有谁知道为什么它默认为 30 而不是使用我的 web.xml 文件中指定的时间？
EDIT:
我在 jsp 页面上编写了代码，用于检查会话属性，如果确实存在，则在一分钟后将用户重定向到登录页面，即使在页面刷新时，用户也不会被重定向。
if(session.getAttribute("username") != null){
out.println(session.getAttribute("username"));
}else{
response.setStatus(response.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "index.jsp");
}
编辑完整代码（Login.java）：
package com.labs.xmlgenerator.controller.managesession;
import java.io.IOException;
import java.sql.SQLException;
import java.util.HashMap;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.labs.xmlgenerator.model.dbconnection.*;
/**
* Servlet implementation class Login
*/
@WebServlet(description = "Verifies Users Credentials", urlPatterns = { "/Login" })
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
private DbLoginQueries query = new DbLoginQueries();
/**
* @see HttpServlet#HttpServlet()
*/
/*
public Login() {
super();
// TODO Auto-generated constructor stub
}*/
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
validateLoginCredentials(request.getParameter("liUsr"),request.getParameter("liPwd"),request,response);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void validateLoginCredentials (String username, String password, HttpServletRequest request, HttpServletResponse response) throws IOException, ClassNotFoundException, SQLException{
Boolean valid = true;
int resultSize;
HashMap<String, String> userDetails = null;
HttpSession session = request.getSession(true);
String location = "index.jsp";
Cookie usernameErrorCookie;
Cookie passwordErrorCookie;
Cookie usernameCookie;
if(username == null || username == ""){
valid = false;
usernameErrorCookie = new Cookie("liUsrErrCookie","Please enter a valid username");
response.addCookie(usernameErrorCookie);
}else{
usernameCookie = new Cookie("liUsrCookie",username);
response.addCookie(usernameCookie);
}
if(password == null || password == ""){
valid = false;
passwordErrorCookie = new Cookie("liPwdErrCookie","Please enter a valid password");
response.addCookie(passwordErrorCookie);
}
if(valid == true){
userDetails = query.loginQuery(username);
resultSize = userDetails.size();
if(resultSize < 4){
valid = false;
usernameErrorCookie = new Cookie("liUsrErrCookie","The username entered is not valid");
response.addCookie(usernameErrorCookie);
}
else if(resultSize > 4){
valid = false;
usernameErrorCookie = new Cookie("liUsrErrCookie","The username is returning more than one result, please contact admin");
response.addCookie(usernameErrorCookie);
}
else if(resultSize == 4){
if(!userDetails.get("Password").equals(password)){
valid = false;
passwordErrorCookie = new Cookie("liPwdErrCookie","The entered password is incorrect");
response.addCookie(passwordErrorCookie);
}
}
}
if(valid == true){
session.setAttribute("username", userDetails.get("Username"));
session.setAttribute("permission", userDetails.get("AdminPermissions"));
session.setAttribute("email", userDetails.get("Email"));
location = "home.jsp";
}else{
location = "index.jsp#login";
}
response.setStatus(response.SC_MOVED_TEMPORARILY);
response.setHeader("Location", location);
}
}
home.jsp
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Home</title>
<link rel="stylesheet" href="resources/css/Common.css" type="text/css">
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="resources/js/Common.js"></script>
</head>
<body>
<header>
<div id="actionsMenu">
<ul id="actionLinks">
<li><a class="linkButtons" id="userNameLink">
<%
System.out.println(session.getMaxInactiveInterval());
if(session.getAttribute("username") != null){
out.println(session.getAttribute("username"));
}else{
out.println("no user");
/*
response.setStatus(response.SC_MOVED_TEMPORARILY);
response.setHeader("Location", "index.jsp");*/
}
%>
</a></li>
<li><a class="linkButtons" href="Logout">Log Out</a></li>
<li><a class="linkButtons" href="#">Update</a></li>
</ul>
</div>
</header>
<nav class="tabs">
<section id="generateSection">
<h2 class="selectedTab" id="generateTab">
<a id="gene" href="#generateXML">Generate XML</a>
</h2>
<div class="selectedContent" id="generateNav">
<ul id="links">
<li><a class="navLink" href="#graphic">Graphic Interface</a></li>
<li><a class="navLink" href="#xml">XML Interface</a></li>
</ul>
</div>
</section>
<section id="adminSection">
<h2 class="normalTab" id="adminTab">
<a href="#admin">Admin</a>
</h2>
<div class="normalContent" id="adminNav">
<ul id="links">
<li><a class="navLink" href="#images">Manage Images</a></li>
<li><a class="navLink" href="#keywords">Manage Keywords</a></li>
<li><a class="navLink" href="#users">Manage Users</a></li>
</ul>
</div>
</section>
</nav>
<div id="content">
<noscript><p id="javascriptError">This website requires JavaScript to be enabled.</p></noscript>
</div>
<div id="updateUserDetails"></div>
<div id="popup">
<input type="button" value="X" id="exitButton">
<p class="pageTitle" style="float:left; margin:0px;">Update Details</p>
<form id="updateForm" action="Update" onsubmit="return updateValidation()" method="post" >
<p id="user">Username :</p>
<p id="userNameUpdate"><%
if(session.getAttribute("username") != null){
out.println(session.getAttribute("username"));
}%></p>
<p class="error" id="updCurrentPwdErr">
<%
Cookie[] currentPassEror = null;
currentPassEror = request.getCookies();
if(currentPassEror != null){
for(int i = 0; i < currentPassEror.length; i++){
Cookie cookie = currentPassEror[i];
if(cookie.getName().equals("updCurrentPwdErrCookie")){
out.println(cookie.getValue());
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
%>
</p>
<label for="updCurrentPwdLbl">Current Password :</label>
<br />
<input type="password" name="updCurrentPwd" id="updCurrentPwd">
<br />
<p class="error" id="updNewPwdErr">
<%
Cookie[] newPassCookies = null;
newPassCookies = request.getCookies();
if(newPassCookies != null){
for(int i = 0; i < newPassCookies.length; i++){
Cookie cookie = newPassCookies[i];
if(cookie.getName().equals("updNewPwdErrCookie")){
out.println(cookie.getValue());
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
%></p>
<label for="updNewPwdLbl">New Password :</label>
<br />
<input type="password" id="updNewPwd" name="updNewPwd">
<br />
<p class="error" id="updReNewPwdErr">
<%
Cookie[] reNewPassCookies = null;
reNewPassCookies = request.getCookies();
if(reNewPassCookies != null){
for(int i = 0; i < reNewPassCookies.length; i++){
Cookie cookie = reNewPassCookies[i];
if(cookie.getName().equals("updReNewPwdErrCookie")){
out.println(cookie.getValue());
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
%>
</p>
<label for="updReNewPwdLbl">Re-Enter New Password :</label>
<br />
<input type="password" id="updReNewPwd" name="updReNewPwd">
<br />
<p class="error" id="updEmailErr">
<%
Cookie[] emailErrCookies = null;
emailErrCookies = request.getCookies();
if(emailErrCookies != null){
for(int i = 0; i < emailErrCookies.length; i++){
Cookie cookie = emailErrCookies[i];
if(cookie.getName().equals("updEmailErrCookie")){
out.println(cookie.getValue());
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
%>
</p>
<label for="updEmailLbl">Email :</label>
<br />
<input type="text" id="updEmail" name="updEmail" value="<%
boolean foundEmailCookie = false;
Cookie[] emailCookies = null;
emailCookies = request.getCookies();
if(emailCookies != null){
for(int i = 0; i < emailCookies.length; i++){
Cookie cookie = emailCookies[i];
if(cookie.getName().equals("updEmailCookie")){
foundEmailCookie = true;
out.println(cookie.getValue());
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
if(!foundEmailCookie){
if(session.getAttribute("email") != null){
out.println(session.getAttribute("email"));
}
}
%>">
<input type="hidden" id="updUrl" name="updUrl" value="">
<br />
<input type="submit" value="UPDATE">
</form>
</div>
</body>
</html>
