spring 拦截器

1.mvc.xml

<!-- 自定义拦截链配置 -->  

<mvc:interceptors>  

<mvc:interceptor>  

<mvc:mapping path="/supplier/*"/>  

<mvc:mapping path="/goods/*"/>  

<mvc:mapping path="/contact/*"/>  

<bean class="com.young4j.controller.UserInterceptor"></bean>  

</mvc:interceptor>  

</mvc:interceptors> 

<mvc:interceptors>  

<!-- 局部拦截器 -->  

<mvc:interceptor>                   

<mvc:exclude-mapping path="/user_login" />  

<mvc:exclude-mapping path="/user_logout" />  

<mvc:mapping path="/**" />  

<bean class="com.young4j.interceptor.MyInterceptor" />  

</mvc:interceptor>  

</mvc:interceptors>

登录拦截器

public class LoginInterceptor implements HandlerInterceptor {

	//日志
	protected Logger log = Logger.getLogger(getClass());
	
	
	
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
			Object handle) throws Exception {
		
		//创建session
		HttpSession session =request.getSession();
		
		//无需登录，允许访问的地址
		String[] allowUrls =new String[]{"/toLogin","/login"};
			
		//获取请求地址
		String url =request.getRequestURL().toString();
		
		//获得session中的用户
		UserToken user =(UserToken) session.getAttribute("userToken");
	
		
		for (String strUrl : allowUrls) {
			if(url.contains(strUrl))
			{
				return true;
			}
		}
		
		if(user ==null)
		{
			throw new UnLoginException("您尚未登录！");	
								
		}
		//重定向
		//response.sendRedirect(request.getContextPath()+"/toLogin");
			
		
			return true;
		
		
	}

	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		
	}
	
}

设置session

HttpSession session=event.getSession;

session.setMaxInactiveInterval(30*60);//以秒为单位