@Component
public class TimeFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    System.out.println("time filter init");
  }
 
  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    System.out.println("time filter start");
    long startTime = System.currentTimeMillis();
 
    filterChain.doFilter(servletRequest, servletResponse);
 
    long endTime = System.currentTimeMillis();
    System.out.println("time filter consume " + (endTime - startTime) + " ms");
    System.out.println("time filter end");
  }
 
  @Override
  public void destroy() {
    System.out.println("time filter init");
  }
}

@Component
public class TimeInterceptor extends HandlerInterceptorAdapter {
 
  private final NamedThreadLocal<Long> startTimeThreadLocal = new NamedThreadLocal<>("startTimeThreadLocal");
 
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    System.out.println("time interceptor preHandle");
 
    HandlerMethod handlerMethod = (HandlerMethod) handler;
    // 獲取處理當(dāng)前請(qǐng)求的 handler 信息
    System.out.println("handler 類：" + handlerMethod.getBeanType().getName());
    System.out.println("handler 方法：" + handlerMethod.getMethod().getName());
 
    MethodParameter[] methodParameters = handlerMethod.getMethodParameters();
    for (MethodParameter methodParameter : methodParameters) {
      String parameterName = methodParameter.getParameterName();
      // 只能獲取參數(shù)的名稱，不能獲取到參數(shù)的值
      //System.out.println("parameterName: " + parameterName);
    }
 
    // 把當(dāng)前時(shí)間放入 threadLocal
    startTimeThreadLocal.set(System.currentTimeMillis());
 
    return true;
  }
 
  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    System.out.println("time interceptor postHandle");
  }
 
  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
 
    // 從 threadLocal 取出剛才存入的 startTime
    Long startTime = startTimeThreadLocal.get();
    long endTime = System.currentTimeMillis();
 
    System.out.println("time interceptor consume " + (endTime - startTime) + " ms");
 
    System.out.println("time interceptor afterCompletion");
  }
}

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
 
  @Autowired
  private TimeInterceptor timeInterceptor;
 
  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(timeInterceptor);
  }
}

time filter start
time interceptor preHandle
handler 類：com.nextyu.demo.web.controller.HelloController
handler 方法：sayHello
name: tom
time interceptor postHandle
time interceptor consume 40 ms
time interceptor afterCompletion
time filter consume 51 ms
time filter end

@Aspect
@Component
public class TimeAspect {
 
  @Around("execution(* com.nextyu.demo.web.controller.*.*(..))")
  public Object handleControllerMethod(ProceedingJoinPoint pjp) throws Throwable {
 
    System.out.println("time aspect start");
 
    Object[] args = pjp.getArgs();
    for (Object arg : args) {
      System.out.println("arg is " + arg);
    }
 
    long startTime = System.currentTimeMillis();
 
    Object object = pjp.proceed();
 
    long endTime = System.currentTimeMillis();
    System.out.println("time aspect consume " + (endTime - startTime) + " ms");
 
    System.out.println("time aspect end");
 
    return object;
  }
 
}

time filter start
time interceptor preHandle
handler 類：com.nextyu.demo.web.controller.HelloController
handler 方法：sayHello
time aspect start
arg is tom
name: tom
time aspect consume 0 ms
time aspect end
time interceptor postHandle
time interceptor consume 2 ms
time interceptor afterCompletion
time filter consume 4 ms
time filter end

graph TD
httprequest-->filter
filter-->interceptor
interceptor-->aspect
aspect-->controller