SpringMVC中Session超时拦截器配置

1、在Spring配置文件中配置对应的拦截器，下面是我的拦截器配置

<!-- 拦截器配置 -->
	<mvc:interceptors>
		<!-- session超时 -->
		<mvc:interceptor>
			<mvc:mapping path="/*/*" />
			<bean class="tm.change.www.interceptor.SessionTimeoutInterceptor">
				<property name="allowUrls">
					<list>
						<!-- 如果请求中包含以下路径，则不进行拦截 -->
						<value>/login</value>
						<value>/js</value>
						<value>/css</value>
						<value>/image</value>
						<value>/images</value>
					</list>
				</property>
			</bean>
		</mvc:interceptor>
	</mvc:interceptors>

2、写出对应的sessionTimeoutInterceptor类

/**
 * session拦截器
 * 
 * @author tianyong
 * 
 */
public class SessionTimeoutInterceptor implements HandlerInterceptor {

	public String[] allowUrls;// 还没发现可以直接配置不拦截的资源，所以在代码里面来排除

	public void setAllowUrls(String[] allowUrls) {
		this.allowUrls = allowUrls;
	}

	@Override
	public void afterCompletion(HttpServletRequest arg0,
			HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2, ModelAndView arg3) throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object arg2) throws Exception {
		String requestUrl = request.getRequestURI().replace(request.getContextPath(), "");
//		System.out.println(requestUrl);
		if (null != allowUrls && allowUrls.length >= 1)
			for (String url : allowUrls) {
				if (requestUrl.contains(url)) {
					return true;
				}
			}
			User user = (User) request.getSession().getAttribute("user");
		if (user != null) {
			return true; // 返回true，则这个方面调用后会接着调用postHandle(), afterCompletion()
		} else {
			// 未登录 跳转到登录页面
			throw new SessionTimeoutException();// 返回到配置文件中定义的路径
		}
	}

}

3、因为未登录的时候我们抛出了一个错误，我们可以在配置文件中拦截这个错误，已完成session销毁跳转

<!-- 自定义异常处理，SimpleMappingExceptionResolver这个类可以是个空类，但是要写，方便在java代码里面使用 -->
	<bean id="exceptionResolver"
		class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<property name="exceptionMappings">
			<props>
				<prop key="tm.change.www.interceptor.SessionTimeoutException">redirect:../index.jsp</prop>
			</props>
		</property>
	</bean>

而SessionTimeoutException只有一个类的壳子就行，继承exception，主要作用是出错之后跳转到index页面

4、此方法在iframe中登录页面将会在子窗口中打开，这是一个问题，还没有解决

5、另一种方法如下

/**
 * spring拦截器
 * @author tianyong
 *
 */
public class SecurityInterceptor implements HandlerInterceptor{

	public String[] allowUrls;// 还没发现可以直接配置不拦截的资源，所以在代码里面来排除

	public void setAllowUrls(String[] allowUrls) {
		this.allowUrls = allowUrls;
	}

	@Override
	public void afterCompletion(HttpServletRequest arg0,
			HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2, ModelAndView arg3) throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object arg2) throws Exception {
		String requestUrl = request.getRequestURI().replace(request.getContextPath(), "");
		response.setContentType("text/html; charset=utf-8");
		HttpSession session = request.getSession(true);
//		System.out.println(requestUrl);
		if (null != allowUrls && allowUrls.length >= 1)
			for (String url : allowUrls) {
				if (requestUrl.contains(url)) {
					return true;
				}
			}
		Object obj = session.getAttribute(SystemConstants.SEESION_IUSER);
		if (obj == null || "".equals(obj.toString())) {
//			throw new SessionTimeoutException();// 返回到配置文件中定义的路径
//			response.sendRedirect(SystemConstants.LOGIN_URL);
			PrintWriter out = response.getWriter();  
            StringBuilder builder = new StringBuilder();  
            builder.append("<script type="text/javascript" charset="UTF-8">");  
            builder.append("alert("页面过期，请重新登录");");  
            builder.append("window.top.location.href=""+SystemConstants.LOGIN_URL+""");  
            builder.append("</script>");  
            out.print(builder.toString());  
            out.close();  
			
		} 
		return true; // 返回true，则这个方面调用后会接着调用postHandle(), afterCompletion()
	}

以上解决了iframe中登录页面出现位置错误问题，当session超时时候用js强制跳转到登录页面中