Java9 Process API改进
在Java 9中,负责控制和管理操作系统进程的Process API得到了相当大的改进。ProcessHandle类现在提供了进程的原生进程ID、启动时间、累计CPU时间、参数、命令、用户、父进程和子孙进程。ProcessHandle类还提供了检查进程是否存活以及销毁进程的方法。它还具有onExit方法,当进程退出时,CompletableFuture类可以异步执行操作。
Tester.java
import java.time.ZoneId;
import java.util.stream.Stream;
import java.util.stream.Collectors;
import java.io.IOException;
public class Tester {
public static void main(String[] args) throws IOException {
ProcessBuilder pb = new ProcessBuilder("notepad.exe");
String np = "Not Present";
Process p = pb.start();
ProcessHandle.Info info = p.info();
System.out.printf("Process ID : %s%n", p.pid());
System.out.printf("Command name : %s%n", info.command().orElse(np));
System.out.printf("Command line : %s%n", info.commandLine().orElse(np));
System.out.printf("Start time: %s%n",
info.startInstant().map(i -> i.atZone(ZoneId.systemDefault())
.toLocalDateTime().toString()).orElse(np));
System.out.printf("Arguments : %s%n",
info.arguments().map(a -> Stream.of(a).collect(
Collectors.joining(" "))).orElse(np));
System.out.printf("User : %s%n", info.user().orElse(np));
}
}
输出
您将看到以下输出。
Process ID : 5800
Command name : C:\Windows\System32\notepad.exe
Command line : Not Present
Start time: 2017-11-04T21:35:03.626
Arguments : Not Present
User: administrator