Spring Mvc拦截器的使用

青旅半醒 2022-12-28 09:29 203阅读 0赞

### 1.在配置文件中配置拦截器 ###

<mvc:interceptors>
        <mvc:interceptor>
            
            <mvc:mapping path="/**" />
    
            
            <mvc:exclude-mapping path="/user/login" />
    
            
            <bean class="com.sqtg.interceptor.AuthInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors>

### 2.拦截器的实现类 ###

package com.sqtg.interceptor;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.RedisTemplate;
    
    /** * 登录拦截器 * 判断是否登录 */
    public class AuthInterceptor implements HandlerInterceptor { 
    
        @Autowired
        private RedisTemplate rt;
        
        /** * 在Controller处理请求之前调用,可以进行编码、安全控制、权限校验等处理; * @param request * @param response * @param handler * @return * @throws Exception */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
            //获取前端传递过来的token
            String getToken = request.getParameter("token");
            //取出redis中存储的token
            Object token = rt.opsForValue().get(getToken);
    
            if(token == null){ 
                return false;      //验证不通过
            }
            return true;      //验证通过
        }
    
        /** * 在Controller处理请求执行完成后，DispatcherServlet渲染视图之前执行; * @param request * @param response * @param handler * @param modelAndView */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) { 
    		
        }
        
        /** * 在DispatcherServlet完全处理完请求(视图的渲染)后被调用，可用于清理资源等; * @param request * @param response * @param handler * @param ex */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { 
    		
        }
    }

以上只是拦截器非常简单的使用，如有出错欢迎指正。