本文章摘编、转载需要注明来源 http://write.blog.csdn.net/postedit/8572467

对于spring security我个人是比较喜欢的一个安全框架,我们的系统中一般需要提供强制将用户踢出的功能,这个功能security也有提供,

首先我们要操作需要获取sessionRegistry中认证用户的所有SessionInformation,然后逐个调用SessionInformation里的expireNow()方法,然后ConcurrentSessionFilter

就会执行用户登录注销的功能;对于这个sessionRegistry.removeSessionInformation(sessionInformation
                    .getSessionId());我不知道是不是我的用法不对,调用了也不会强制注销用户的session,因为官方源代码中说调用removeSessionInformation的时候会让session的监听器响应到,但是我是没成功(望使用这个方式成功的朋友留言告诉下我);下面我们就看为什么调用SessionInformation里的expireNow()方法就能注销用户

/**
	 * 把当前用户踢出系统
	 */
	public void shotOff() {
		List<SessionInformation> sessionInformations = sessionRegistry
				.getAllSessions(SpringSecurityManager.getAuthentication()
						.getPrincipal(), false);
		for (SessionInformation sessionInformation : sessionInformations) {
			sessionInformation.expireNow();

			// sessionRegistry.removeSessionInformation(sessionInformation
					.getSessionId());

		}
	}

我们来看下SessionInformation的源码

 private Date lastRequest;
    private final Object principal;
    private final String sessionId;
    private boolean expired = false;

    //~ Constructors ===================================================================================================

    public SessionInformation(Object principal, String sessionId, Date lastRequest) {
        Assert.notNull(principal, "Principal required");
        Assert.hasText(sessionId, "SessionId required");
        Assert.notNull(lastRequest, "LastRequest required");
        this.principal = principal;
        this.sessionId = sessionId;
        this.lastRequest = lastRequest;
    }

    //~ Methods ========================================================================================================

    public void expireNow() {
        this.expired = true;
    }

    public Date getLastRequest() {
        return lastRequest;
    }

    public Object getPrincipal() {
        return principal;
    }

    public String getSessionId() {
        return sessionId;
    }

    public boolean isExpired() {
        return expired;
    }

    /**
     * Refreshes the internal lastRequest to the current date and time.
     */
    public void refreshLastRequest() {
        this.lastRequest = new Date();
    }

看到的是调用expireNow方法时候会将属性expired设置为true;

然后我们来看下需要处理的ConcurrentSessionFilter过滤器的源码

    private SessionRegistry sessionRegistry;
    private String expiredUrl;
    private LogoutHandler[] handlers = new LogoutHandler[] {new SecurityContextLogoutHandler()};
    private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

    //~ Methods ========================================================================================================


    /**
     * @deprecated Use constructor which injects the <tt>SessionRegistry</tt>.
     */
    public ConcurrentSessionFilter() {
    }

    public ConcurrentSessionFilter(SessionRegistry sessionRegistry) {
        this(sessionRegistry, null);
    }

    public ConcurrentSessionFilter(SessionRegistry sessionRegistry, String expiredUrl) {
        this.sessionRegistry = sessionRegistry;
        this.expiredUrl = expiredUrl;
    }

    @Override
    public void afterPropertiesSet() {
        Assert.notNull(sessionRegistry, "SessionRegistry required");
        Assert.isTrue(expiredUrl == null || UrlUtils.isValidRedirectUrl(expiredUrl),
                expiredUrl + " isn't a valid redirect URL");
    }

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;

        HttpSession session = request.getSession(false);

        if (session != null) {
            SessionInformation info = sessionRegistry.getSessionInformation(session.getId());

            if (info != null) {
                if (info.isExpired()) {
                    // Expired - abort processing
                    doLogout(request, response);

                    String targetUrl = determineExpiredUrl(request, info);

                    if (targetUrl != null) {
                        redirectStrategy.sendRedirect(request, response, targetUrl);

                        return;
                    } else {
                        response.getWriter().print("This session has been expired (possibly due to multiple concurrent " +
                                "logins being attempted as the same user).");
                        response.flushBuffer();
                    }

                    return;
                } else {
                    // Non-expired - update last request date/time
                    sessionRegistry.refreshLastRequest(info.getSessionId());
                }
            }
        }

        chain.doFilter(request, response);
    }

    protected String determineExpiredUrl(HttpServletRequest request, SessionInformation info) {
        return expiredUrl;
    }

    private void doLogout(HttpServletRequest request, HttpServletResponse response) {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();

        for (LogoutHandler handler : handlers) {
            handler.logout(request, response, auth);
        }
    }

    /**
     * @deprecated use constructor injection instead
     */
    @Deprecated
    public void setExpiredUrl(String expiredUrl) {
        this.expiredUrl = expiredUrl;
    }

    /**
     * @deprecated use constructor injection instead
     */
    @Deprecated
    public void setSessionRegistry(SessionRegistry sessionRegistry) {
        this.sessionRegistry = sessionRegistry;
    }

    public void setLogoutHandlers(LogoutHandler[] handlers) {
        Assert.notNull(handlers);
        this.handlers = handlers;
    }

    public void setRedirectStrategy(RedirectStrategy redirectStrategy) {
        this.redirectStrategy = redirectStrategy;
    }

很明显代码中有遇到if (info.isExpired())逻辑判断,这个时候如果表达式的值为true就会执行里面的doLogout方法,而这个方法里面就会调用我们配置的注销监听器,当前用户在之前认证成功后的状态也会失效了

然后看下xml里怎么配置

<!-- SESSION管理 -->
	<bean id="sessionRegistry"
		class="org.springframework.security.core.session.SessionRegistryImpl" />

	<bean id="concurrentSessionFilter"
		class="org.springframework.security.web.session.ConcurrentSessionFilter">
		<property name="sessionRegistry" ref="sessionRegistry" />
		<property name="expiredUrl" value="/apply/skip/restimeout.html" />
		<property name="logoutHandlers">
			<list>
				<ref local="logoutHandler" />
			</list>
		</property>
	</bean>
	
	<!-- 注销监听器  -->
	<bean id="logoutHandler"
		class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler">
		<property name="InvalidateHttpSession" value="true" />
	</bean>