测试网络延迟 工具类

 

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import java.io.IOException; import java.net.InetAddress; import java.net.Socket; import java.util.ArrayList; import java.util.List; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit;   public class NetworkLatencyTester {       public static List<Long> integerIsReachableList = new ArrayList<>();     public static List<Long> integerTCPList = new ArrayList<>();     private final String host;     private final int port;     private final long interval;     private final ScheduledExecutorService scheduler;       public NetworkLatencyTester(String host, int port, long interval) {         this.host = host;         this.port = port;         this.interval = interval;         this.scheduler = Executors.newSingleThreadScheduledExecutor();     }       public void start() {         scheduler.scheduleAtFixedRate(this::testLatency, 0, interval, TimeUnit.SECONDS);     }       public void stop() {         scheduler.shutdown();     }       private void testLatency() {         try {             // 使用 InetAddress 测试 ICMP 延迟             long startTime = System.currentTimeMillis();             boolean reachable = InetAddress.getByName(host).isReachable(5000); // 超时时间为 5 秒             long endTime = System.currentTimeMillis();             long latency = endTime - startTime;               if (reachable) {                 System.out.println("Host " + host + " is reachable. Latency: " + latency + " ms");                 integerIsReachableList.add(latency);             } else {                 System.out.println("Host " + host + " is not reachable.");             }               // 使用 Socket 测试 TCP 延迟             startTime = System.currentTimeMillis();             try (Socket socket = new Socket(host, port)) {                 endTime = System.currentTimeMillis();                 latency = endTime - startTime;                 integerTCPList.add(latency);                 System.out.println("TCP connection to " + host + ":" + port + " successful. Latency: " + latency + " ms");             } catch (IOException e) {                 endTime = System.currentTimeMillis();                 latency = endTime - startTime;                 System.out.println("TCP connection to " + host + ":" + port + " failed. Latency: " + latency + " ms");             }           } catch (IOException e) {             System.err.println("Error testing latency: " + e.getMessage());         }     }       public static void main(String[] args) {         String host = "xx.xx.xx.xx"; // 替换为你要测试的IP或主机名         int port = 8000; // 替换为你要测试的端口         long interval = 5; // 测试间隔时间，单位为秒           NetworkLatencyTester tester = new NetworkLatencyTester(host, port, interval);         tester.start();           // 为了防止程序立即退出，可以添加一个休眠时间         try {             Thread.sleep(123 * 1000); // 休眠 120 秒         } catch (InterruptedException e) {             e.printStackTrace();         }           tester.stop();           // 计算 integerIsReachableList 的平均值         double averageIsReachableLatency = calculateAverage(integerIsReachableList);         System.out.println("Average ICMP Latency: " + averageIsReachableLatency + " ms");           // 计算 integerTCPList 的平均值         double averageTCPLatency = calculateAverage(integerTCPList);         System.out.println("Average TCP Latency: " + averageTCPLatency + " ms");     }       private static double calculateAverage(List<Long> list) {         if (list.isEmpty()) {             return 0.0;         }         long sum = 0;         for (Long latency : list) {             sum += latency;         }         return (double) sum / list.size();     } }