如何在Java 9中检索Process API的所有流程数据？
在Java9中，ProcessAPI 已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，开始 时间，累积的 CPU 时间，参数，命令，用户，父 进程和后代。它还提供了一种检查过程活动性 和破坏 过程的方法。我们使用allProcesses()方法将所有ProcessHandle 数据作为流检索。
在下面的示例中，我们检索所有流程信息。
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("所有过程：");
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());
}
}输出结果
--------------------------- 所有过程： Id: 7056 isAlive(): true number of childrens: 0 isSupportsNormalTermination(): false Info: [user: Optional[Nhooo\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.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[Nhooo\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.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[Nhooo\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.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[Nhooo\User], cmd: C:\Program Files (x86)\Google\Chrome\Application\chrome.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[Nhooo\User], cmd: C:\WINDOWS\System32\conhost.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[Nhooo\User], cmd: C:\Program Files\Mozilla Firefox\firefox.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[Nhooo\User], cmd: C:\Program Files\Mozilla Firefox\firefox.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[Nhooo\User], cmd: C:\Program Files\Mozilla Firefox\firefox.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[Nhooo\User], cmd: C:\Program Files\Java\jdk-9.0.4\bin\java.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