SpringBoot集成之拦截器

素颜马尾好姑娘i 2021-10-18 15:38 246阅读 0赞

前面我们已将介绍过过滤器了，接下来我们来讲讲拦截器，其实拦截器和过滤器的功能相近，过滤器能做的拦截器也能做，具体区别，本文不做说明，网上有很多相关文章~

配置拦截器也是十分简单的，首先你需要定义一个拦截器

package com.example.demo.intercepter;
    
    import com.example.demo.controller.HelloController;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    /**
     * Created by linjiaming
     */
    public class HelloIntercepter implements HandlerInterceptor {
        Logger log = LoggerFactory.getLogger(HelloIntercepter.class);
        /**
         * 进入controller方法之前
         * @param request
         * @param response
         * @param handler
         * @return
         * @throws Exception
         */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                Object handler) throws Exception {
            log.info("prehandle");
            //true放行
            return true;
        }
    
        /**
         * 方法内部处理完成，页面渲染之前
         * @param request
         * @param response
         * @param handler
         * @param modelAndView
         * @throws Exception
         */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                ModelAndView modelAndView) throws Exception {
            log.info("postHandle");
        }
    
        /**
         * 页面渲染之后
         * @param request
         * @param response
         * @param handler
         * @param ex
         * @throws Exception
         */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                Object handler, Exception ex) throws Exception {
            log.info("afterCompletion");
    
        }
    }

之后你需要将其定义为springboot的配置类

package com.example.demo.config;
    
    import com.example.demo.intercepter.HelloIntercepter;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    /**
     * Created by linjiaming
     */
    @Configuration
    public class Myconfig implements WebMvcConfigurer {
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new HelloIntercepter()).addPathPatterns("/**");
        }
    }

这里需要注意的是springboot1.x和2.x版本实现的方式不同，具体请参见[https://www.jianshu.com/p/0420b5fb3073][https_www.jianshu.com_p_0420b5fb3073]

运行之后控制台打印如下：

![20190812173228633.png][]

[https_www.jianshu.com_p_0420b5fb3073]: https://www.jianshu.com/p/0420b5fb3073
[20190812173228633.png]: /images/20211018/f26a9c0a0f164841ae92a42d09fd50cb.png