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  • Spring的AsyncHandlerInterceptor

    AsyncHandlerInterceptor提供了一个afterConcurrentHandlingStarted()方法, 这个方法会在Controller方法异步执行时开始执行, 而Interceptor的postHandle方法则是需要等到Controller的异步执行完才能执行

    例如

        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            System.out.println(11111);
        }
    
        @Override
        public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            System.out.println(22222);
        }
    @ResponseBody
        @RequestMapping(value = "/topQuery")
        public DeferredResult<Object> topQuery(@RequestParam String token,
                @RequestParam(required = false, defaultValue = "") String tn,
                @RequestParam(required = false, defaultValue = "baiduhui") String zt) {
            topQueryCounter.increment();
            DeferredResult<Object> dr = new DeferredResult<Object>();
            Map<String, Object> extra = Maps.newHashMap();
            extra.put(TN_KEY, TN_KEY + "=" + tn);
            extra.put(ZT_KEY, ZT_KEY + "=" + zt);
            topQueryService.fetchData(dr, "limit=" + topQueryLimit, 1, new AtomicInteger(0),
                    new ArrayList<BaiduTopQuery>(), extra);
            return dr;
        }

    afterConcurrentHandlingStarted()方法会在return dr后执行, 而postHandle()方法则需要dr.setResult()以后才会执行

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  • 原文地址:https://www.cnblogs.com/zemliu/p/3556615.html
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