springboot学习笔记2---配置拦截器：

package com.zs.springboot.interceptor;

import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 创建一个拦截器，在ssm框架中，创建拦截器时需要在xml做如下配置
 *      <mvc:interceptors>
 *         <mvc:interceptor>
 *             <mvc:mapping path="/**"/>
 *             <mvc:exclude-mapping path="/login"/>
 *             <bean class=""/>
 *         </mvc:interceptor>
 *     </mvc:interceptors>
 *     上面的配置如果使用springboot该如何使用java类配置？
 *     1.创建一个配置类，继承mvc配置适配器，表示这是一个mvc配置文件
 */
@SpringBootConfiguration
public class MvcInterceptorConfig extends WebMvcConfigurerAdapter {

    /**
     * 实现添加拦截器的方法
     * @param registry：拦截器注册器，相当于<mvc:interceptors>标签
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        /**
         * 实现注册方法添加拦截器:相当于
         *  <mvc:interceptor>
         *      <mvc:mapping path="/**"/>
         *      <mvc:exclude-mapping path="/login"/>
         *      <bean class=""/>
         *  </mvc:interceptor>
        * */
        registry.addInterceptor(loginIngerceptor()).addPathPatterns("/**").excludePathPatterns("/login");
    }

    private HandlerInterceptor loginIngerceptor() {
        HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
            @Override
            public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
                System.out.println("我是拦截器，我被访问了");
                return true;
            }

            @Override
            public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

            }

            @Override
            public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

            }
        };
        return handlerInterceptor;
    }
}