public interface Filter {
    //用于執(zhí)行過濾器的初始化工作，web容器會(huì)在web項(xiàng)目啟動(dòng)時(shí)自動(dòng)調(diào)用該方法
    default void init(FilterConfig filterConfig) throws ServletException {
    }
 
    //當(dāng)請(qǐng)求和響應(yīng)被過濾器攔截后，都會(huì)交給doFilter來處理:其中兩個(gè)參數(shù)分別是被攔截request和response對(duì)象，可以使用chain的doFliter方法來放行
    void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException;
    //用于釋放關(guān)閉Filter對(duì)象打開的資源，在web項(xiàng)目關(guān)閉時(shí)，由web容器自動(dòng)調(diào)用該方法
    default void destroy() {
    }
}

@Component
@Slf4j
public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("初始化過濾器：" + filterConfig.getFilterName());
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;

        // 對(duì)請(qǐng)求進(jìn)行過濾操作處理
        log.info("MyFilter 開始對(duì)請(qǐng)求進(jìn)去過濾操作！");
        String requestURI = httpRequest.getRequestURI();
        log.info("請(qǐng)求地址：" + requestURI);

        // 繼續(xù)執(zhí)行下一個(gè) Filter，如果沒有其他 Filter 的話就執(zhí)行 Controller 層代碼
        long startTime = System.currentTimeMillis();
        chain.doFilter(request, response);

        // 執(zhí)行完用戶請(qǐng)求后，回到這里對(duì) response 響應(yīng)內(nèi)容做一些處理
        long endTime = System.currentTimeMillis();
        log.info("請(qǐng)求處理完畢，所花費(fèi)時(shí)間為：" + (endTime - startTime) + "ms");
    }

    @Override
    public void destroy() {
        log.info("銷毀過濾器 MyFilter");
    }

}

@WebFilter(filterName = "myFilter",urlPatterns = {"/*"})

@Configuration
public class MyFilterConfig {
 
    @Bean
    public FilterRegistrationBean myFilter(){
        FilterRegistrationBean fb = new FilterRegistrationBean();
        //設(shè)置filter啟動(dòng)順序
        fb.setOrder(1);
        fb.setFilter(new MyFilter());
        fb.addInitParameter("phone","183****5510");
        //設(shè)置攔截請(qǐng)求規(guī)則,這里攔截所有請(qǐng)求
        fb.addUrlPatterns("/*");
        return fb;
    }
}

public interface HandlerInterceptor {
    //預(yù)處理方法，本方法在控制器方法（MyController的方法）之前執(zhí)        行，用戶的請(qǐng)求最先到達(dá)此方法，在這個(gè)方法中可以獲取請(qǐng)求的信息，驗(yàn)證請(qǐng)求是否符合要求。以驗(yàn)證用戶是否登錄，驗(yàn)證用戶是否有權(quán)限訪問某個(gè)鏈接地址（url）。如果返回true則放行，返回false則攔截
    default boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return true;
    }
    //后處理方法。在controller中的方法之后執(zhí)行的。能夠獲取到處理器方法的返回值 mv，可以修改mv中的數(shù)據(jù)和視圖。可以影響到最后的執(zhí)行結(jié)果。主要是對(duì)原來的執(zhí)行結(jié)果做二次修正
    default void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }
    //最后執(zhí)行的方法，在頁面渲染之后執(zhí)行。在請(qǐng)求處理完成后執(zhí)行的，框架中規(guī)定是當(dāng)你的視圖處理完成后，對(duì)視圖進(jìn)行了forword。就任務(wù)請(qǐng)求處理完成。
    default void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }
}

public class MyInterceptor implements HandlerInterceptor {
    private static final Logger LOGGER = LoggerFactory.getLogger(MyInterceptor.class);

    private static final ThreadLocal<Long> START_THREAD_LOCAL = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        String uri = request.getRequestURI();
        LOGGER.info(uri + " preHandle");
        Long startTime = System.currentTimeMillis();    //獲取開始時(shí)間
        START_THREAD_LOCAL.set(startTime);  //線程綁定變量（該數(shù)據(jù)只有當(dāng)前請(qǐng)求的線程可見）
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        String uri = request.getRequestURI();
        LOGGER.info(uri + " postHandle");
        Long startTime = START_THREAD_LOCAL.get();//得到線程綁定的局部變量（開始時(shí)間）
        Long endTime = System.currentTimeMillis();  //2、結(jié)束時(shí)間
        Long time = endTime - startTime;
        LOGGER.info("http request all time: " + time + "ms");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                Exception ex) throws Exception {
        String uri = request.getRequestURI();
        LOGGER.info(uri + " afterCompletion");
        if (START_THREAD_LOCAL != null) {
            START_THREAD_LOCAL.remove();    // 移除ThreadLocal中的局部變量
        }
    }
}

@Configuration
public class MyInterceptorConfig implements WebMvcConfigurer {
 
    /**
     * 配置攔截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(myInterceptor())
                .addPathPatterns("/api/v1/**")//需要攔截的請(qǐng)求
                .addPathPatterns("/api/v1/**")//需要攔截的請(qǐng)求
                .excludePathPatterns("/api/debug/**")//不攔截的請(qǐng)求
                .excludePathPatterns("api/page/getName");//不攔截的請(qǐng)求
    }
 
    /**
     * 注入攔截器到spring容器
     * @return
     */
    @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }
}