SpringBoot 自定义拦截器

第一步：创建SpringBoot项目，添加依赖：

    org.springframework.boot
    spring-boot-starter-web

第二步：自定义拦截器

public class MyHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle：请求前调用");
        return true;//返回false则请求中断
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle：请求后调用");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion：请求调用完成后回调的方法，即在视图渲染完成后回调");
    }
}

第三步：配置拦截器

@Configuration
public class WebConfigurer implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        MyHandlerInterceptor myHandlerInterceptor = new MyHandlerInterceptor();
        //如果有多个拦截器的话，添加顺序就是拦截顺序
        registry.addInterceptor(getHandlerInterceptor())
                .addPathPatterns("/**");
        WebMvcConfigurer.super.addInterceptors(registry);
    }
    @Bean
    public static HandlerInterceptor getHandlerInterceptor() {
        return new MyHandlerInterceptor();
    }
}

第四步：自定义Controller

@RestController
public class DispatcherController {
    @RequestMapping("/fun")
    public void fun() {
        System.out.println("fun");
    }
}

部署项目，浏览器中访问fun