如何在 Java 9 中使用 Process API 終止/銷毀進程？

在 Java 9 中，Process API 支援一種簡單的方法來取得大量有關進程的資訊。 ProcessHandle介面可以識別並提供對本機進程的控制以及檢查進程活動性和銷毀進程的方法，而ProcessHandle.Info介面可以提供進程的資訊快照。我們需要使用ProcessHandle介面的destroy()方法來銷毀進程。

在下面的範例中，我們需要使用ProcessHandle介面終止進程。

範例

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>);
   }
}

輸出

<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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