ssm配置拦截器

深碍√TFBOYSˉ_ 2022-07-12 10:53 154阅读 0赞

在spring-mvc中使用标签

<mvc:interceptors>
            <mvc:interceptor>
            
                <mvc:mapping path="/*"/>
                
                <mvc:exclude-mapping path="/login"/>
                <bean class="com.chen.interceptor.LoginInterceptor"></bean>
            </mvc:interceptor>
        </mvc:interceptors>

创建自定义拦截器

package com.chen.interceptor;
    
    import com.chen.entity.User;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpSession;
    
    /** * Created by Administrator on 2017/2/21 0021. */
    public class LoginInterceptor implements HandlerInterceptor { 
    
        @Override
        public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {
           //首先进入的方法
            System.out.println("preHandle");
            //return false表示拦截，不向下执行
             //return true表示放行
            System.out.println(request.getServletPath());
            HttpSession session = request.getSession();
            User u=(User)session.getAttribute("userInfo");
            if(u!=null){
                return true;
            }else{
                return false;
            }
    
        }
        //返回modelAndView之前执行
        @Override
        public void postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    
            System.out.println("postHandle");
        }
        //执行Handler完成执行此方法
        @Override
        public void afterCompletion(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
            System.out.println("afterCompletion");
        }
    }