方式一：實現

HandlerInterceptor接口，實現接口內的方法

public class LoginInterceptor implements HandlerInterceptor {
	//執行控制器之前的攔截程序
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		HttpSession session = request.getSession();
		User user = (User)session.getAttribute("user");
		if(user == null) {
			String contextPath = request.getContextPath();
			response.sendRedirect(contextPath+"/user/login");
			return false;
		}else {
			return true;
		}		
	}
	//執行控制器之后的邏輯
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
	}
	//視圖渲染之后的邏輯
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
	}
}

spring-mvc配置文件內容

    <!-- 攔截器 -->
    <mvc:interceptors>
    	<mvc:interceptor>
    		<mvc:mapping path="/**"/>
    		<mvc:exclude-mapping path="/static/**"/>
    		<mvc:exclude-mapping path="/user/login"/>
    		<mvc:exclude-mapping path="/user/AjaxDoLogin"/>
    		<bean class="com.cn.LoginInterceptor"></bean>
    	</mvc:interceptor>    
    </mvc:interceptors>

方式二：

繼承HandlerIntercrprorAdapter實現類并重寫preHandle方法

邏輯和上面的類似

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