如何在Java 9中检索Process API的所有进程数据？

在Java 9中，Process API被用于控制和管理操作系统进程。ProcessHandle类提供了进程的本机进程ID，启动时间，累积CPU时间，参数，命令，用户，父进程和子孙进程。它还提供了一种检查进程活动状态和销毁进程的方法。我们通过使用allProcesses()方法将所有ProcessHandle数据作为流来检索。

在下面的示例中，我们检索所有进程的信息。

示例

import java.util.stream.Stream;
import java.util.Optional;
import java.util.stream.Stream;

public class AllProcessesTest {
   public static void main(String args[]) throws InterruptedException {
      System.out.println("---------------------------");
      System.out.println("All Processes:");
      Stream<ProecessHandle> processStream = ProcessHandle.allProcesses();
      processStream.forEach(process -> printInfo(process));
   }
   private static void printInfo(ProcessHandle processHandle) {
      System.out.println("---------");
      System.out.println("Id: " + processHandle.pid());
      System.out.println("isAlive(): " + processHandle.isAlive());
      System.out.println("number of childrens: " + processHandle.children().count());
      System.out.println("isSupportsNormalTermination(): " + processHandle.supportsNormalTermination());

      ProcessHandle.Info processInfo = processHandle.info();
      System.out.println("Info: " + processInfo.toString());
      System.out.println("Info arguments().isPresent(): " + processInfo.arguments().isPresent());
      System.out.println("Info command().isPresent(): " + processInfo.command().isPresent());
      System.out.println("Info totalCpuDuration().isPresent(): " + processInfo.totalCpuDuration().isPresent());
      System.out.println("Info user().isPresent(): " + processInfo.user().isPresent());
   }
}

输出

---------------------------
All Processes:

Id: 7056
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program Files (x86)GoogleChromeApplicationchrome.exe, startTime: Optional[2020-03-09T03:26:00.406Z], totalTime: Optional[PT1M52.15625S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 6168
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program Files (x86)GoogleChromeApplicationchrome.exe, startTime: Optional[2020-03-09T03:26:01.567Z], totalTime: Optional[PT2M24.671875S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 7972
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program Files (x86)GoogleChromeApplicationchrome.exe, startTime: Optional[2020-03-09T03:26:03.118Z], totalTime: Optional[PT29.09375S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 3368
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program Files (x86)GoogleChromeApplicationchrome.exe, startTime: Optional[2020-03-09T03:27:26.511Z], totalTime: Optional[PT37.84375S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 2456
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:WINDOWSSystem32conhost.exe, startTime: Optional[2020-03-09T03:30:49.514Z], totalTime: Optional[PT0.390625S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 7804
isAlive(): true
number of childrens: 4
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program FilesMozilla Firefoxfirefox.exe, startTime: Optional[2020-03-09T03:30:51.441Z], totalTime: Optional[PT38.046875S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 8172
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program FilesMozilla Firefoxfirefox.exe, startTime: Optional[2020-03-09T03:30:53.293Z], totalTime: Optional[PT4.03125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 6008
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program FilesMozilla Firefoxfirefox.exe, startTime: Optional[2020-03-09T03:30:54.081Z], totalTime: Optional[PT5M28.078125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
---------
Id: 1032
isAlive(): false
number of childrens: 0
isSupportsNormalTermination(): false
Info: []
Info arguments().isPresent(): false
Info command().isPresent(): false
Info totalCpuDuration().isPresent(): false
Info user().isPresent(): false
---------
Id: 5044
isAlive(): true
number of childrens: 0
isSupportsNormalTermination(): false
Info: [user: Optional[TutorialspointUser], cmd: C:Program FilesJavajdk-9.0.4binjava.exe, startTime: Optional[2020-03-09T04:12:39.567Z], totalTime: Optional[PT1.28125S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true