java中应对高并发的两种策略

//含有20个线程的线程池
private ExecutorService executorService = Executors.newFixedThreadPool(20);

//同步调用线程池的submit方法 简单实现 拥塞窗口为20的队列泄洪(一个服务器同一时间只能处理20个请求，其他请求队列等待)
Future<Object> future = executorService.submit(new Callable<Object>() {
    @Override
    public Object call() throws Exception {
        //此处调用下游有并发压力的接口
        return null;
    }
});
try {
    future.get();
} catch (InterruptedException e) {
    e.printStackTrace();
} catch (ExecutionException e) {
    e.printStackTrace();
}

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>18.0</version>
  </dependency>

private RateLimiter rateLimiter = RateLimiter.create(300);//限制300tps

    //入口处限流
        if(!rateLimiter.tryAcquire()){
            //抛出异常;
        }