Spring自带了一套拦截器HandlerInterceptor，类似AspNet中的Filter。

public class ApiInterceptor implements HandlerInterceptor {    //请求之前    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        System.out.println("进入拦截器");        return true;    }    //请求时    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {     }    //请求完成    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {     }}

　同时需要在配置类中重写addInterceptors方法

@SpringBootConfigurationpublic class WebConfig extends WebMvcConfigurationSupport{     @Override    protected void addInterceptors(InterceptorRegistry registry) {        super.addInterceptors(registry);        registry.addInterceptor(new ApiInterceptor());    }}