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法律学如何在 Java 9 中使用 Process API 终止/销毁进程？
在 Java 9 中，进程 API 支持一种简便的方法来获取有关进程的大量信息。ProcessHandle 接口可以识别并提供对本地进程的控制以及检查进程的活动状态和销毁进程的方法，而 ProcessHandle.Info 接口可以提供进程的信息快照。我们需要使用 ProcessHandle 接口的 destroy() 方法来销毁进程。
在下面的示例中，我们需要使用 ProcessHandle 接口来终止进程。
示例
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 Process process = new ProcessBuilder(javaCmd, "-cp", classpath, DestroyProcessTest.class.getName()).start();
ProcessHandle processHandle = process.toHandle();
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.destroy();
}
private static void printInfo(ProcessHandle processHandle) {
System.out.println("---------");
System.out.println("Id: " + processHandle.pid());
System.out.println("isAlive(): " + processHandle.isAlive());
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
--------------------------- 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
更新于：2020 年 3 月 6 日
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