如何在Java 9中使用Process API获取流程的所有子级？
进程处理类和相关的API已在Java9中引入。我们可以使用ProcessHandle 接口和相关方法来获取pid 以及有关其他相关进程的信息。我们需要获取进程的所有子级，然后使用java.lang.ProcessHandle.children()方法。此方法返回流，通常是没有子进程的流。
在下面的示例中，我们可以获取第一个流程并检索其子流程的信息。
示例
import java.util.stream.Stream;
import java.util.Optional;
public class ChilderenProcessTest {
public static void main(String args[]) throws InterruptedException {
System.out.println("---------------------------");
System.out.println("子进程：");
Optional<ProcessHandle> processHandle = ProcessHandle.allProcesses().findFirst();
processHandle.ifPresent(proc -> proc.children().forEach(child -> System.out.println("PID: [ " + child.pid() + " ], Cmd: [ " + child.info().command() + " ]")));
}
}输出结果
--------------------------- 子进程： PID: [ 0 ], Cmd: [ Optional.empty ] PID: [ 4 ], Cmd: [ Optional.empty ] PID: [ 424 ], Cmd: [ Optional.empty ] PID: [ 504 ], Cmd: [ Optional.empty ] PID: [ 560 ], Cmd: [ Optional.empty ] PID: [ 444 ], Cmd: [ Optional.empty ] PID: [ 1236 ], Cmd: [ Optional.empty ] PID: [ 1288 ], Cmd: [ Optional.empty ] PID: [ 1408 ], Cmd: [ Optional.empty ] PID: [ 1424 ], Cmd: [ Optional.empty ] PID: [ 1452 ], Cmd: [ Optional.empty ] PID: [ 1468 ], Cmd: [ Optional.empty ] PID: [ 5412 ], Cmd: [ Optional[C:\WINDOWS\System32\taskhostex.exe] ] PID: [ 3760 ], Cmd: [ Optional[C:\Program Files\Synaptics\SynTP\SynTPEnh.exe] ] PID: [ 5216 ], Cmd: [ Optional[C:\WINDOWS\explorer.exe] ] PID: [ 2460 ], Cmd: [ Optional[C:\Program Files (x86)\Dell Wireless\Bluetooth Suite\BtvStack.exe] ] PID: [ 6064 ], Cmd: [ Optional[C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe] ] PID: [ 7172 ], Cmd: [ Optional[C:\Program Files (x86)\Google\Chrome\Application\chrome.exe] ] PID: [ 860 ], Cmd: [ Optional[C:\Program Files (x86)\Google\Chrome\Application\chrome.exe] ] PID: [ 9000 ], Cmd: [ Optional.empty ] PID: [ 4180 ], Cmd: [ Optional[C:\WINDOWS\System32\cmd.exe] ] PID: [ 3748 ], Cmd: [ Optional[C:\WINDOWS\System32\conhost.exe] ] PID: [ 3376 ], Cmd: [ Optional.empty ] PID: [ 2548 ], Cmd: [ Optional.empty ] PID: [ 1820 ], Cmd: [ Optional[C:\Program Files\Java\jdk-9.0.4\bin\java.exe] ]