Java 使用 CountDownLatch 模拟1000一个并发访问

package com.zzf.concurrence.cdtest;



import java.util.concurrent.CountDownLatch;



public class CountdownLatchTest {



private static CountDownLatch cd = new CountDownLatch(1000);



private static final int CONCURRENCE_COUNT = 1000 + 1;



public static void main(String[] args) {

// 一千个线程，同时怼一个方法



for (int i = 0; i < CONCURRENCE_COUNT; i++) {

new Thread(new SendTask()).start();

cd.countDown();



}



long currentTimeMillis = System.currentTimeMillis();

try {

cd.countDown();

cd.await();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}



System.out.println("当前用时：" + (System.currentTimeMillis() - currentTimeMillis));



}



private static class SendTask implements Runnable {



@Override

public void run() {

try {

cd.await();

} catch (InterruptedException e) {

e.printStackTrace();

}



sendsms();

}



}



private static void sendsms() {



// System.out.println("信息发送成功"+System.currentTimeMillis());



}



}