public interface Filter {
    //用于執行過濾器的初始化工作，web容器會在web項目啟動時自動調用該方法
    default void init(FilterConfig filterConfig) throws ServletException {
    }
 
    //當請求和響應被過濾器攔截后，都會交給doFilter來處理:其中兩個參數分別是被攔截request和response對象，可以使用chain的doFliter方法來放行
    void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException;
    //用于釋放關閉Filter對象打開的資源，在web項目關閉時，由web容器自動調用該方法
    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;

        // 對請求進行過濾操作處理
        log.info("MyFilter 開始對請求進去過濾操作！");
        String requestURI = httpRequest.getRequestURI();
        log.info("請求地址：" + requestURI);

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

        // 執行完用戶請求后，回到這里對 response 響應內容做一些處理
        long endTime = System.currentTimeMillis();
        log.info("請求處理完畢，所花費時間為：" + (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();
        //設置filter啟動順序
        fb.setOrder(1);
        fb.setFilter(new MyFilter());
        fb.addInitParameter("phone","183****5510");
        //設置攔截請求規則,這里攔截所有請求
        fb.addUrlPatterns("/*");
        return fb;
    }
}

public interface HandlerInterceptor {
    //預處理方法，本方法在控制器方法（MyController的方法）之前執        行，用戶的請求最先到達此方法，在這個方法中可以獲取請求的信息，驗證請求是否符合要求。以驗證用戶是否登錄，驗證用戶是否有權限訪問某個鏈接地址（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中的數據和視圖。可以影響到最后的執行結果。主要是對原來的執行結果做二次修正
    default void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }
    //最后執行的方法，在頁面渲染之后執行。在請求處理完成后執行的，框架中規定是當你的視圖處理完成后，對視圖進行了forword。就任務請求處理完成。
    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();    //獲取開始時間
        START_THREAD_LOCAL.set(startTime);  //線程綁定變量（該數據只有當前請求的線程可見）
        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（開始時間）
        Long endTime = System.currentTimeMillis();  //2、結束時間
        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/**")//需要攔截的請求
                .addPathPatterns("/api/v1/**")//需要攔截的請求
                .excludePathPatterns("/api/debug/**")//不攔截的請求
                .excludePathPatterns("api/page/getName");//不攔截的請求
    }
 
    /**
     * 注入攔截器到spring容器
     * @return
     */
    @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }
}