spring的filter、interception、aop對(duì)比

filter

在spring boot中定義filter實(shí)現(xiàn)filter方法。filter方法能夠拿到執(zhí)行的request和response,獲取不到具體執(zhí)行的controller

//@Component
public class TimeFilter implements Filter {

    /* (non-Javadoc)
     * @see javax.servlet.Filter#destroy()
     */
    @Override
    public void destroy() {
        System.out.println("time filter destroy");
    }

    /* (non-Javadoc)
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        System.out.println("time filter start");
        long start = new Date().getTime();
        chain.doFilter(request, response);
        System.out.println("time filter 耗時(shí):"+ (new Date().getTime() - start));
        System.out.println("time filter finish");
    }

    /* (non-Javadoc)
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    @Override
    public void init(FilterConfig arg0) throws ServletException {
        System.out.println("time filter init");
    }

}

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
    
    @SuppressWarnings("unused")
    @Autowired
    private TimeInterceptor timeInterceptor;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
//      registry.addInterceptor(timeInterceptor);
    }
    
//  @Bean
    public FilterRegistrationBean timeFilter() {
        
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        
        TimeFilter timeFilter = new TimeFilter();
        registrationBean.setFilter(timeFilter);
        // 指定哪些路徑起作用
        List<String> urls = new ArrayList<>();
        urls.add("/*");
        registrationBean.setUrlPatterns(urls);

        
        return registrationBean;
        
    }

}

interception

spring boot中定義interception需要實(shí)現(xiàn)HandlerInterceptor，interception能夠拿到具體是哪個(gè)方法執(zhí)行的和requset、response。但是拿不到具體方法中的參數(shù)。

@Component
public class TimeInterceptor implements HandlerInterceptor {

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        System.out.println("preHandle");
        
        System.out.println(((HandlerMethod)handler).getBean().getClass().getName());
        System.out.println(((HandlerMethod)handler).getMethod().getName());
        
        request.setAttribute("startTime", new Date().getTime());
        //返回的bool值，決定是否后面的方法是否執(zhí)行
        return true;
    }

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("time interceptor 耗時(shí):"+ (new Date().getTime() - start));

    }

    /* (non-Javadoc)
     * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println("afterCompletion");
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("time interceptor 耗時(shí):"+ (new Date().getTime() - start));
        System.out.println("ex is "+ex);

    }

}

aop

spring中定義aop需要指定切點(diǎn)，和執(zhí)行邏輯。能夠拿到具體方法的參數(shù)。但是獲取不到request和response

//@Aspect
//@Component
public class TimeAspect {
    //@Before()
    //@After()

    
    @Around("execution(* com.imooc.web.controller.UserController.*(..))")
    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 start = new Date().getTime();
        
        Object object = pjp.proceed();
        
        System.out.println("time aspect 耗時(shí):"+ (new Date().getTime() - start));
        
        System.out.println("time aspect end");
        
        return object;
    }

}

總結(jié)

filter:filter方法能夠拿到執(zhí)行的request和response,獲取不到具體執(zhí)行的controller
interception:interception能夠拿到具體是哪個(gè)方法執(zhí)行的和requset、response。但是拿不到具體方法中的參數(shù)。
Aop:能夠拿到具體方法的參數(shù),獲取不到requset、response
他們之間執(zhí)行的順序:filter-> interception->@Around aop->具體執(zhí)行的方法->產(chǎn)生異常->@Around aop->@ControllerAdvice 全局異常處理-> interception-> filter