Java获取Process子进程进程ID方法详解

<dependency>
  <groupId>net.java.dev.jna</groupId>
  <artifactId>jna</artifactId>
  <version>5.12.1</version>
</dependency>
<dependency>
  <groupId>net.java.dev.jna</groupId>
  <artifactId>jna-platform</artifactId>
  <version>5.12.1</version>
</dependency>

Process p = Runtime.getRuntime().exec("ping -n 1000 localhost");
Field f = p.getClass().getDeclaredField("handle");
f.setAccessible(true);
long handle = f.getLong(p);
Kernel32 kernel = Kernel32.INSTANCE;
WinNT.HANDLE winntHandle = new WinNT.HANDLE();
winntHandle.setPointer(Pointer.createConstant(handle));
int pid = kernel.GetProcessId(winntHandle);
System.out.println("进程id="+pid);
InputStream in = p.getInputStream();
byte[] b = new byte[1024];
int len = -1;
try {
    while (true) {
        len = in.read(b);
        System.out.print(new String(b, 0, len, "GBK"));
        Thread.sleep(1000L);
    }
} catch (Exception e) {
    e.printStackTrace();
}

Process p = Runtime.getRuntime().exec("ping -c 1000 localhost");
Field pid = p.getClass().getDeclaredField("pid");
pid.setAccessible(true);
System.out.println(pid.getInt(p));