如何從java中的ping命令獲取延遲

Question

使用此代碼，我可以從服務器獲得延遲，但我無法將其保存在變量中。

我已經嘗試過了，但不幸的是我是 Java 新手，無法解決這個問題。 如何以毫秒 (ms) 為單位獲得變量的平均延遲？

謝謝您的幫助！

編輯：我需要平均延遲，所以我只需要“Mittelwert”的值——在這個例子中，變量中的值“25”。 所以我將 J.Doe 的代碼添加到我的代碼中，並將“時間”更改為“Mittelwert”並更改

"String timeWithValue = s.split(" = ")[2];"

"字符串值 = timeWithValue.split("ms")[0]"

所以這段代碼需要插入到代碼中，然后“Mittelwert”形式的平均延遲將在變量“latency”中得到保護。

但現在輸出不會返回“平均延遲：25”。 根本不會返回平均延遲。 有人知道為什么會這樣嗎？

 System.out.println("here is the average latency :\n");
double latency = 0.0;
while ((s = stdInput.readLine()) != null)
{
    if (s.contains("Mittelwert")) {
        String timeWithValue = s.split(" = ")[2];
        String value = timeWithValue.split("ms")[0];
        latency = Double.parseDouble(value);
        System.out.println("latency " + latency);
    }
}

Output: 
Here is the standard output of the command:


Ping wird ausgef?hrt f?r 74.125.236.73 [2a00:1f78:fffd:9::d435:9868] mit 32 Bytes Daten:
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=26ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=25ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=25ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=29ms 

Ping-Statistik f?r 2a00:1f78:fffd:9::d435:9868:
    Pakete: Gesendet = 4, Empfangen = 4, Verloren = 0
    (0% Verlust),
Ca. Zeitangaben in Millisek.:
    Minimum = 25ms, Maximum = 29ms, Mittelwert = 26ms
Here is the standard error of the command (if any):

here is the average latency :










import java.io.*;
import java.util.*;

public class JavaPingExampleProgram
{

  public static void main(String args[]) 
  throws IOException
  {
    // create the ping command as a list of strings
    JavaPingExampleProgram ping = new JavaPingExampleProgram();
    List<String> commands = new ArrayList<String>();
    commands.add("ping");
    //commands.add("-c");
    //commands.add("5");
    commands.add("74.125.236.73");
    ping.doCommand(commands);
  }

  public void doCommand(List<String> command) 
  throws IOException
  {
    String s = null;

    ProcessBuilder pb = new ProcessBuilder(command);
    Process process = pb.start();

    BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
    BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
    
    // read the output from the command
    System.out.println("Here is the standard output of the command:\n");
    while ((s = stdInput.readLine()) != null)
    {
      System.out.println(s);
    }

    // read any errors from the attempted command
    System.out.println("Here is the standard error of the command (if any):\n");
    while ((s = stdError.readLine()) != null)
    {
      System.out.println(s);
    }
  }

}



Output:
Here is the standard output of the command:


Ping wird ausgef?hrt f?r 74.125.236.73 [2a00:1f78:fffd:9::d435:9868] mit 32 Bytes Daten:
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=26ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=25ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=24ms 
Antwort von 2a00:1f78:fffd:9::d435:9868: Zeit=25ms 

Ping-Statistik f?r 2a00:1f78:fffd:9::d435:9868:
    Pakete: Gesendet = 4, Empfangen = 4, Verloren = 0
    (0% Verlust),
Ca. Zeitangaben in Millisek.:
    Minimum = 24ms, Maximum = 26ms, Mittelwert = 25ms
Here is the standard error of the command (if any):

Answer 1

如果你的輸出是這樣的

PING google.de (216.58.208.35): 56 data bytes
64 bytes from 216.58.208.35: icmp_seq=0 ttl=118 time=22.126 ms
64 bytes from 216.58.208.35: icmp_seq=1 ttl=118 time=27.877 ms
64 bytes from 216.58.208.35: icmp_seq=2 ttl=118 time=18.077 ms
64 bytes from 216.58.208.35: icmp_seq=3 ttl=118 time=33.099 ms

嘗試這個：

while ((s = stdInput.readLine()) != null)
        {
            if (s.contains("time")) {
                String timeWithValue = s.split(" ")[6];
                String value = timeWithValue.split("=")[1];
                double latency = Double.parseDouble(value);
                System.out.println(latency);
            }

        }