【发布时间】：2012-03-01 23:18:04
【问题描述】：
我正在使用 Spring Security，我想知道哪些用户当前在线。我首先尝试了使用SessionRegistryImpl和<session-management session-authentication-strategy-ref="..." ... />的方法，但我猜这个列表存储在内存中，我想避免它（这将是一个巨大的网站，很多用户会同时在线，列表可能会变得很大）。如果我错了，请纠正我。
我尝试的第二种方法是使用侦听器和HttpSessionListener 接口和自定义AuthenticationManager 并将“在线标志”存储在数据库中。基本上，该标志在我的身份验证管理器的authenticate(...) 方法中设置为true，在我的会话监听器的sessionDestroyed(...) 方法中设置为false。
web.xml：
<web-app 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"
version="2.5">
<display-name>Test</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/security.xml</param-value>
</context-param>
<!-- Security -->
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>my.package.SessionListener</listener-class>
</listener>
<servlet>
<servlet-name>test</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>1</session-timeout>
</session-config>
</web-app>
Spring 安全配置：
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd">
<beans:bean id="authenticationManager" class="my.package.security.AuthenticationManager" />
<http disable-url-rewriting="true" authentication-manager-ref="authenticationManager">
<!--<intercept-url pattern="/" access="ROLE_ANONYMOUS" />-->
<intercept-url pattern="/login*" access="ROLE_ANONYMOUS" />
<intercept-url pattern="/favicon.ico" access="ROLE_ANONYMOUS" />
<intercept-url pattern="/*" access="ROLE_USER" />
<form-login login-processing-url="/authorize" login-page="/login" authentication-failure-url="/login-failed" />
<logout logout-url="/logout" logout-success-url="/login" />
<remember-me data-source-ref="dataSource" />
</http>
</beans:beans>
my.package.SessionListener：
public class SessionListener implements HttpSessionListener
{
public void sessionCreated(HttpSessionEvent httpSessionEvent)
{
}
public void sessionDestroyed(HttpSessionEvent httpSessionEvent)
{
UserJpaDao userDao = WebApplicationContextUtils.getWebApplicationContext(httpSessionEvent.getSession().getServletContext()).getBean(UserJpaDao.class);
Authentication a = SecurityContextHolder.getContext().getAuthentication();
if(a != null)
{
User loggedInUser = userDao.findByAlias(a.getName());
if(loggedInUser != null)
{
loggedInUser.setOnline(false);
userDao.save(loggedInUser);
}
}
}
}
my.package.security.AuthenticationManager：
public class AuthenticationManager implements org.springframework.security.authentication.AuthenticationManager
{
@Autowired
UserJpaDao userDao;
public Authentication authenticate(Authentication authentication) throws AuthenticationException
{
User loggedInUser = null;
Collection<? extends GrantedAuthority> grantedAuthorities = null;
...
loggedInUser = userDao.findByAlias(authentication.getName());
if(loggedInUser != null)
{
// Verify password etc.
loggedInUser.setOnline(true);
userDao.save(loggedInUser);
}
else
{
loggedInUser = null;
throw new BadCredentialsException("Unknown username");
}
return new UsernamePasswordAuthenticationToken(loggedInUser, authentication.getCredentials(), grantedAuthorities);
}
}
sessionCreated 和 sessionDestroyed 被正确触发，但 SecurityContextHolder.getContext().getAuthentication(); 始终为空。
更新：几乎一切都运行良好。唯一的问题是，当会话因超时而过期时，SecurityContextHolder.getContext().getAuthentication() 在sessionDestroyed(...) 方法中返回 null。手动触发注销时效果很好。
有人可以帮助我吗？非常感谢任何提示。
谢谢
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标签： spring session spring-security