一文教你搞懂SpringBoot自定义拦截器的思路

public class TestInterceptor implements HandlerInterceptor {
    //前置处理器。进入到Controller层方法之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //TODO 前置拦截的处理逻辑
        //1.判断用户是否登录，登录返回true
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }
    //后置处理器。视图渲染之前执行的方法，对响应结果进行处理。
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //TODO 后置拦截的处理逻辑
        //添加某些数据等等
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    //最终处理器。整个请求完成之后执行。
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // TODO 最终拦截处理器
        //1.记录日志
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

@Configuration
public class TestInterceptorConfig implements WebMvcConfigurer {
    @Bean
    public TestInterceptor testInterceptor(){
        return new TestInterceptor();
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(testInterceptor()).addPathPatterns("/test/**");
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}