多线程那些事儿

Posted 2020-07-20 手边星辰

public void perform(){
        ScheduledExecutorService schedulePool=Executors.newScheduledThreadPool(1);
        
        long initialDelay=10;
        long period=3;
        schedulePool.scheduleAtFixedRate(new Runnable(){
            @Override
            public void run() {
                HttpClient client = new DefaultHttpClient();
                
                String url="http://localhost:8080/member/....../test.do";
                HttpUriRequest get=new HttpGet(url);
                try {
                    HttpResponse res = client.execute(get);
                    System.out.println(EntityUtils.toString(res.getEntity(),"utf-8"));
                } catch (ClientProtocolException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }finally{
                    if(client!=null){
                        client.getConnectionManager().shutdown();  
                    }
                }
                
            }            
        }, initialDelay, period, TimeUnit.SECONDS);
        
    }

监控资源发现，方法内部的线程池关不关闭都无所谓（ExecutorService.shutdown()），

细细想来，也是这个道理：方法跑完的时候方法内所有内部的变量都会被标记为清楚，所以线程池也被标记为清楚了，所以不会占用资源。