package thread; import java.util.concurrent.CountDownLatch; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class CountDownLatchTest1 { // 模拟并发登录网址,查看服务器峰值 public static void main(String[] args) throws InterruptedException { // 锁住所有线程,等待并发执行 final CountDownLatch begin = new CountDownLatch(1); final ExecutorService exec = Executors.newFixedThreadPool(10); for (int index = 0; index < 10; index++) { final int NO = index + 1; Runnable run = new Runnable() { public void run() { try { // 等待,所有一起执行 begin.await(); //开始模拟登录等待。。。 Thread.sleep((long) (Math.random() * 10000)); System.out.println("No." + NO + " execute"); } catch (InterruptedException e) { e.printStackTrace(); } finally { } } }; exec.submit(run); } System.out.println("开始执行"); // begin减一,开始并发执行 begin.countDown(); //关闭执行 exec.shutdown(); } }
java模拟并发访问
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转载自zx-code.iteye.com/blog/2267185
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