wee7 作业

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import java.time.Duration;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CountDownLatch;

@Slf4j
public class PerformanceTest {

    private static SimpleClientHttpRequestFactory httpRequestFactory = new SimpleClientHttpRequestFactory();

    public static void PressureTest(final String url, final int threadNumber, final int total) {

        int times = total / threadNumber;
        List<Long> spendTimeList = new ArrayList<>();
        for (int id = 0; id < times; ++id) {

            CountDownLatch countDownLatch = new CountDownLatch(threadNumber);
            for (int threadIndex = 0; threadIndex < threadNumber; ++threadIndex) {

                new Thread(new Runnable() {
                    @Override
                    public void run() {

                        LocalDateTime begin = LocalDateTime.now();
                        log.debug("请求响应statusCode={}", new RestTemplate(httpRequestFactory).getForEntity(url, String.class).getStatusCodeValue());
                        long duration = Duration.between(begin, LocalDateTime.now()).toMillis();
                        synchronized (spendTimeList) {

                            spendTimeList.add(duration);
                        }
                        log.debug("请求响应时间[{}](毫秒)", duration);
                        countDownLatch.countDown();
                    }
                }).start();
            }

            try {

                countDownLatch.await();
            } catch (InterruptedException e) {

                e.printStackTrace();
            }
        }
        Collections.sort(spendTimeList, Long::compareTo);
        int requestCount = total;
        long index = Math.round(requestCount * 0.95);

        log.debug("95%响应时间[{}](毫秒)", spendTimeList.get((int)index));
    }

    public static void main(String[] args) {

        PressureTest("https://www.baidu.com/", 10, 90);
    }
}