Bagaimana untuk membunuh/memusnahkan proses menggunakan API Proses dalam Java 9?

Di Java 9, Process API menyokong cara mudah untuk mendapatkan banyak maklumat tentang sesuatu proses. Antara muka ProcessHandle boleh mengenal pasti dan menyediakan kawalan ke atas proses dan kaedah asli untuk menyemak aktiviti proses dan memusnahkan proses, manakala antara muka ProcessHandle.Info boleh memberikan gambaran maklumat bagi sesuatu proses. Kita perlu menggunakan kaedah destroy() antara muka ProcessHandle untuk memusnahkan proses.

Dalam contoh di bawah, kita perlu menamatkan proses menggunakan antara muka ProcessHandle.

Contoh

import java.io.File;
import java.io.IOException;
import java.util.Objects;

public class DestroyProcessTest {
   public static void main(String[] args) throws InterruptedException {
      System.out.println("---------------------------");
      System.out.println("Destroy Process:");

      final String javaCmd = getJavaCmdFromParent();
      final String classpath = getClassPathFromParent();

      try {
         final <strong>Process </strong>process = new <strong>ProcessBuilder</strong>(javaCmd, "-cp", classpath, <strong>DestroyProcessTest.class.getName()</strong>).start();
         ProcessHandle processHandle = process.<strong>toHandle()</strong>;
         printInfo(processHandle);
         destroyProcess(processHandle);

         Thread.sleep(1000);
         System.out.println("---------------------------");
         System.out.println("After destroying the process:");
         printInfo(processHandle);

      } catch(IOException e) {
         e.printStackTrace();
      }
   }
   private static String getClassPathFromParent() {
      return System.getProperty("java.class.path", "./*");
   }
   private static String getJavaCmdFromParent() {
      return Objects.isNull(System.getProperty("java.home")) ? "java"
: String.format("%s%sbin%sjava", System.getProperty("java.home"), File.separator, File.separator);
   }
   private static void destroyProcess(ProcessHandle processHandle) throws IllegalStateException {
      System.out.println("Ready to destroy Process with id: " + processHandle.pid());
      processHandle.<strong>destroy()</strong>;
   }
   private static void printInfo(ProcessHandle processHandle) {
      System.out.println("---------");
      System.out.println("Id: " +<strong> </strong>processHandle<strong>.pid()</strong>);
      System.out.println("isAlive(): " +<strong> </strong>processHandle<strong>.isAlive()</strong>);
      System.out.println("isSupportsNormalTermination(): " + processHandle.<strong>supportsNormalTermination()</strong>);

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

Output

<strong>---------------------------
Destroy Process:
---------
Id: 4384
isAlive(): true
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Java\jdk-9.0.4\bin\java.exe, startTime: Optional[2020-03-06T10:58:53.210Z], totalTime: Optional[PT0.046875S]]
Info arguments().isPresent(): false
Info command().isPresent(): true
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true
Ready to destroy Process with id: 4384
---------------------------
After destroying the process:
---------
Id: 4384
isAlive(): false
isSupportsNormalTermination(): false
Info: [user: Optional[Tutorialspoint\User], startTime: Optional[2020-03-06T10:58:53.210Z], totalTime: Optional[PT0.109375S]]
Info arguments().isPresent(): false
Info command().isPresent(): false
Info totalCpuDuration().isPresent(): true
Info user().isPresent(): true</strong>

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