SpringBoot - 自定义拦截器HandlerInterceptor

1.实现HandlerInterceptor接口

/**
 * 自定义拦截器
 */
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("====在该方法执行之前执行====");
        // 返回true才会继续执行，返回false则取消当前请求
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("执行完方法之后进执行(Controller方法调用之后)，但是此时还没进行视图渲染");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("整个请求都处理完咯，DispatcherServlet也渲染了对应的视图咯，此时我可 以做一些清理的工作了");
    }
}

2.在配置类中注册自定义拦截器

@Configurationpublic class AppConfig {
    @Bean
    public WebMvcConfigurer webMvcConfigurer(){
        return new WebMvcConfigurer() {
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                registry.addInterceptor(new MyInterceptor())
                        .addPathPatterns("/**") //要拦截的请求
                        .excludePathPatterns("/","/index","/css/**","/js/**");//不拦截的请求
            }
        };
    }
}