給線程指定超時時間，超時則停止線程

private String getRecommendCount(BaseInfo baseInfo) throws Exception{
        ExecutorService exec = Executors.newCachedThreadPool();
//        int timeout = 5; // 訪問接口的時間限制
        String terminalIds = getTerminalIds(baseInfo.getTaskInfo().getBranch());
        String queryDate = getQueryDate(baseInfo.getTaskInfo().getBranch());
        TradeCountThread task = new TradeCountThread(terminalIds, queryDate);
        Future<String> future = exec.submit(task);
        String taskResult = "";
        String failReason = null;
        try {
            // 等待計算結果，最長等待timeout秒，timeout秒后中止任務
            taskResult = future.get(LIMIT_SECONDS, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            failReason = "主線程在等待返回結果時被中斷！";
        } catch (ExecutionException e) {
            failReason = "主線程等待返回結果，但任務本身拋出異常！";
        } catch (TimeoutException e) {
            failReason = "主線程等待計算結果超時，因此中斷任務線程！";
            exec.shutdownNow();
        }
        exec.shutdown();
        log.info("taskResult : " + taskResult);
        log.info("failReason : " + failReason);
        return taskResult;
    }
    
    
    private class TradeCountThread implements Callable<String> {
        
        private String terminalIds;
        private String queryDate;
        public TradeCountThread(String terminalIds, String queryDate){
            this.terminalIds = terminalIds;
            this.queryDate = queryDate;
        }

        public String call() throws Exception {
            String resultStr = "";
            String reqStr = "{\"verifyID\":\"getTxnCounts\",\"list\":["
                + terminalIds +"],\"queryTime\":'" 
                + queryDate +"'}";
            System.out.println("reqStr::"+reqStr);
            try{
                Service service = new Service();
                Call call = (Call) service.createCall();
                call.setTargetEndpointAddress(GET_TXN_COUNT_URL);
                call.setOperation(OPERATION_NAME);
                resultStr = (String) call.invoke(new Object[]{reqStr });
            }catch(Exception e ){
                e.printStackTrace();
                throw e;
            }
            return resultStr;
        }  
    }