java高并发测试实例（精确到几百纳秒）

其实就是用CountDownLatch来使多个线程同时运行，同时发送请求，虽然post的事件不能保证同时，但发post能保证同时（相差0.2毫秒），通过这种方法，测试了redis的setkey，getkey来保证不重复数据的时间阈值在几百纳秒，再短就算redis也无能为力了，所以多线程虽然快，但是没锁，还是不太安全。。

@Service

public class TestConcurrentService {

@Autowired
private ApiHttpClientService apiHttpClientService;

private static final Logger logger = Logger.getLogger(TestConcurrentService.class);

public void testConcurrent1(String sign) {

ExecutorService exec = Executors.newFixedThreadPool(3);
CountDownLatch begin = new CountDownLatch(1);
CountDownLatch end = new CountDownLatch(3);
for (int i = 0; i < 3; i++) {
exec.execute(new HttpRequestUtils(begin, end, sign));

}
begin.countDown();

try {
end.await();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
}
exec.shutdown();
logger.info("main method end");
}

public class HttpRequestUtils implements Runnable {
private Logger log = Logger.getLogger(HttpRequestUtils.class);

private CountDownLatch begin;
private CountDownLatch end;

private String sign;

private String url = "http://localhost:8080/score/private/v1/injectsg";

public HttpRequestUtils(CountDownLatch begin, CountDownLatch end, String sign) {
this.begin = begin;
this.end = end;
this.sign = sign;

}

@Override
public void run() {
try {
begin.await();
Map<String, String> header = new HashMap<>();
header.put("Content-Type", "application/json");
header.put("sign", sign);

ScoreRequestBean bean = new ScoreRequestBean();
Data data = new Data();
data.setRemark("单发测试");
data.setExtId("ext111111519");
data.setPartnerMemberId(297);
data.setPoints(1);
bean.setData(data);
bean.setEventId("123asdasd");
System.out.println("线程" + Thread.currentThread().getName() +
"已接受命令," + "时间为：" + System.nanoTime() + "|" + System.nanoTime() / 1000000L);

apiHttpClientService.post(url, null, header, bean, ResultConstant.class);
System.out.println("线程" + Thread.currentThread().getName() +
"命令已结束");
} catch (Exception e) {
log.error(e.getMessage(), e);
} finally {
end.countDown();
}

}
}

}

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