blocks|key|1031347|text|目前还没有这方面的公共API。请参阅Sun+Bug+4244896，Sun+Bug+4250622|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1031348|作为一种解决方法：|1031349|Runtime.exec(...)|code-block|syntax|javascript|1031350|类型的对象|1031351|java.lang.Process|1031352|Process类是抽象的，您得到的是为您的操作系统设计的Process的某个子类。例如，在Mac上，它返回有一个名为pid的私有字段的java.lang.UnixProcess。使用反射，您可以很容易地获得此字段的值。诚然，这是一种黑客行为，但它可能会有所帮助。你需要PID做什么呢？|style|CODE|1031353|entityMap|0|LINK|mutability|MUTABLE|url|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4244896|1|http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=a4867002d972460f4acf3239dc0a?bug_id=4250622^0|M|B|0|12|B|1|0|0|0|0|0|1M|3|1V|L|3Q|3|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]|$A|16|B|17|1|18]]|C|$]]|$1|D|3|E|5|6|7|19|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1A|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1B|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1C|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1D|8|@$A|1E|B|1F|Q|R]|$A|1G|B|1H|Q|R]|$A|1I|B|1J|Q|R]]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]]]

There is no public API for this yet. see Sun <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4244896" rel="noreferrer">Bug 4244896</a>, Sun <a href="http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=a4867002d972460f4acf3239dc0a?bug_id=4250622" rel="noreferrer">Bug 4250622</a>

As a workaround: 

<pre><code>Runtime.exec(...)
</code></pre>

returns an Object of type 

<pre><code>java.lang.Process
</code></pre>

The Process class is abstract, and what you get back is some subclass of Process which is designed for your operating system. For example on Macs, it returns <code>java.lang.UnixProcess</code> which has a private field called <code>pid</code>. Using Reflection you can easily get the value of this field. This is admittedly a hack, but it might help. What do you need the <code>PID</code> for anyway?

blocks|key|816531|text|没有一个简单的解决方案。我以前的方法是启动另一个进程，在类Unix系统上运行ps命令，或者在Windows上运行tasklist命令，然后将该命令的输出解析为我想要的PID。实际上，我最终将这些代码放到了每个平台的单独shell脚本中，该脚本只返回PID，这样我就可以尽可能地保持Java片段的平台无关性。这对于短期任务不是很有效，但这对我来说不是问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|816532|entityMap^0|12|2|1K|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

There isn't a simple solution. The way I've done it in the past is to start another process to run either the <code>ps</code> command on Unix-like systems, or the <code>tasklist</code> command on Windows, and then parse the output of that command for the PID I want. In reality, I ended up putting that code into a separate shell script for each platform which just returned the PID, so that I could keep the Java piece as platform independent as possible. This doesn't work well for short-lived tasks, but that wasn't an issue for me.

blocks|key|816591|text|此页面包含如何操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|816592|http://www.golesny.de/p/code/javagetpid|offset|length|816593|在Windows上：|816594|Runtime.exec(..)|code-block|syntax|javascript|816595|返回“java.lang.Win32Process”或"java.lang.ProcessImpl“的实例|816596|两者都有一个私有字段“句柄”。|816597|这是进程的操作系统句柄。您必须使用此%2B+Win32接口来查询PID。该页面有关于如何做到这一点的详细信息。|816598|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|13|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|18|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|C]]]]

This page has the HOWTO:

<a href="http://www.golesny.de/p/code/javagetpid" rel="noreferrer">http://www.golesny.de/p/code/javagetpid</a>

On Windows:

<pre><code>Runtime.exec(..)
</code></pre>

Returns an instance of "java.lang.Win32Process") OR "java.lang.ProcessImpl"

Both have a private field "handle".

This is an OS handle for the process. You will have to use this + Win32 API to query PID. That page has details on how to do that.

blocks|key|1031480|text|在我的测试中，所有的IMPL类都有"pid“字段。这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1031481|public+static+int+getPid(Process+process)+{
++++try+{
++++++++Class<?>+cProcessImpl+=+process.getClass();
++++++++Field+fPid+=+cProcessImpl.getDeclaredField("pid");
++++++++if+(!fPid.isAccessible())+{
++++++++++++fPid.setAccessible(true);
++++++++}
++++++++return+fPid.getInt(process);
++++}+catch+(Exception+e)+{
++++++++return+-1;
++++}
}|code-block|syntax|javascript|1031482|只要确保返回值不是-1即可。如果是，则解析ps的输出。|offset|length|style|CODE|1031483|entityMap^0|0|0|L|2|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In my testing all IMPL classes had the field "pid". This has worked for me:

<pre><code>public static int getPid(Process process) {
 try {
 Class&lt;?&gt; cProcessImpl = process.getClass();
 Field fPid = cProcessImpl.getDeclaredField("pid");
 if (!fPid.isAccessible()) {
 fPid.setAccessible(true);
 }
 return fPid.getInt(process);
 } catch (Exception e) {
 return -1;
 }
}
</code></pre>

Just make sure the returned value is not -1. If it is, then parse the output of <code>ps</code>.

blocks|key|816641|text|jnr-process项目提供了此功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|816642|它是jruby使用的java本机运行时的一部分，可以被视为未来java-FFI的原型。|816643|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/jnr/jnr-process|1|http://openjdk.java.net/jeps/191^0|0|B|0|0|V|8|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

the <a href="https://github.com/jnr/jnr-process" rel="nofollow">jnr-process</a> project provides this capability.

It is part of the java native runtime used by jruby and can be considered a prototype for a future <a href="http://openjdk.java.net/jeps/191" rel="nofollow">java-FFI</a>

blocks|key|1031531|text|在Unix系统中(Linux和Mac)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1031532|+public+static+synchronized+long+getPidOfProcess(Process+p)+{
++++long+pid+=+-1;

++++try+{
++++++if+(p.getClass().getName().equals("java.lang.UNIXProcess"))+{
++++++++Field+f+=+p.getClass().getDeclaredField("pid");
++++++++f.setAccessible(true);
++++++++pid+=+f.getLong(p);
++++++++f.setAccessible(false);
++++++}
++++}+catch+(Exception+e)+{
++++++pid+=+-1;
++++}
++++return+pid;
++}|code-block|syntax|javascript|1031533|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Unix System (Linux &amp; Mac)

<pre><code> public static synchronized long getPidOfProcess(Process p) {
 long pid = -1;

 try {
 if (p.getClass().getName().equals("java.lang.UNIXProcess")) {
 Field f = p.getClass().getDeclaredField("pid");
 f.setAccessible(true);
 pid = f.getLong(p);
 f.setAccessible(false);
 }
 } catch (Exception e) {
 pid = -1;
 }
 return pid;
 }
</code></pre>

blocks|key|816695|text|将jna+(+"JNA“和"JNA+Platform")包含在您的库中，并使用此函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|816696|import+com.sun.jna.Pointer;
import+com.sun.jna.platform.win32.Kernel32;
import+com.sun.jna.platform.win32.WinNT;
import+java.lang.reflect.Field;

public+static+long+getProcessID(Process+p)
++++{
++++++++long+result+=+-1;
++++++++try
++++++++{
++++++++++++//for+windows
++++++++++++if+(p.getClass().getName().equals("java.lang.Win32Process")+%7C%7C
+++++++++++++++++++p.getClass().getName().equals("java.lang.ProcessImpl"))+
++++++++++++{
++++++++++++++++Field+f+=+p.getClass().getDeclaredField("handle");
++++++++++++++++f.setAccessible(true);++++++++++++++
++++++++++++++++long+handl+=+f.getLong(p);
++++++++++++++++Kernel32+kernel+=+Kernel32.INSTANCE;
++++++++++++++++WinNT.HANDLE+hand+=+new+WinNT.HANDLE();
++++++++++++++++hand.setPointer(Pointer.createConstant(handl));
++++++++++++++++result+=+kernel.GetProcessId(hand);
++++++++++++++++f.setAccessible(false);
++++++++++++}
++++++++++++//for+unix+based+operating+systems
++++++++++++else+if+(p.getClass().getName().equals("java.lang.UNIXProcess"))+
++++++++++++{
++++++++++++++++Field+f+=+p.getClass().getDeclaredField("pid");
++++++++++++++++f.setAccessible(true);
++++++++++++++++result+=+f.getLong(p);
++++++++++++++++f.setAccessible(false);
++++++++++++}
++++++++}
++++++++catch(Exception+ex)
++++++++{
++++++++++++result+=+-1;
++++++++}
++++++++return+result;
++++}|code-block|syntax|javascript|816697|您还可以从here下载JNA，也可以从here下载JNA+Platform。|816698|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/java-native-access/jna#download|1|http://www.java2s.com/Code/Jar/j/Downloadjna330platformjar.htm|2|http://www.java2s.com/Code/Jar/j/Downloadjna325jar.htm^0|1|3|0|0|0|5|4|1|J|4|2|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]|$A|15|B|16|1|17]]|C|$]]|$1|K|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]|U|$5|N|O|P|C|$Q|V]]]]

Include <a href="https://github.com/java-native-access/jna#download" rel="nofollow noreferrer">jna</a> (both "JNA" and "JNA Platform") in your library and use this function:

<pre><code>import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.WinNT;
import java.lang.reflect.Field;

public static long getProcessID(Process p)
 {
 long result = -1;
 try
 {
 //for windows
 if (p.getClass().getName().equals("java.lang.Win32Process") ||
 p.getClass().getName().equals("java.lang.ProcessImpl")) 
 {
 Field f = p.getClass().getDeclaredField("handle");
 f.setAccessible(true); 
 long handl = f.getLong(p);
 Kernel32 kernel = Kernel32.INSTANCE;
 WinNT.HANDLE hand = new WinNT.HANDLE();
 hand.setPointer(Pointer.createConstant(handl));
 result = kernel.GetProcessId(hand);
 f.setAccessible(false);
 }
 //for unix based operating systems
 else if (p.getClass().getName().equals("java.lang.UNIXProcess")) 
 {
 Field f = p.getClass().getDeclaredField("pid");
 f.setAccessible(true);
 result = f.getLong(p);
 f.setAccessible(false);
 }
 }
 catch(Exception ex)
 {
 result = -1;
 }
 return result;
 }
</code></pre>

You can also download JNA from <a href="http://www.java2s.com/Code/Jar/j/Downloadjna330platformjar.htm" rel="nofollow noreferrer">here</a> and JNA Platform from <a href="http://www.java2s.com/Code/Jar/j/Downloadjna325jar.htm" rel="nofollow noreferrer">here</a>.

blocks|key|1031660|text|我认为实现这一点的唯一可移植方法是通过另一个(父)+Java进程运行一个(子)进程，该进程将通知我父进程的实际PID。子进程可以是任何东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1031661|这个包装器的代码是|1031662|package+com.panayotis.wrapper;

import+java.io.File;
import+java.io.IOException;
import+java.lang.management.ManagementFactory;

public+class+Main+{
++++public+static+void+main(String[]+args)+throws+IOException,+InterruptedException+{
++++++++System.out.println(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);
++++++++ProcessBuilder+pb+=+new+ProcessBuilder(args);
++++++++pb.directory(new+File(System.getProperty("user.dir")));
++++++++pb.redirectInput(ProcessBuilder.Redirect.INHERIT);
++++++++pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
++++++++pb.redirectError(ProcessBuilder.Redirect.INHERIT);
++++++++pb.start().waitFor();
++++}
}|code-block|syntax|javascript|1031663|要使用它，只需创建一个jar文件，并使用以下命令参数调用它：|1031664|String+java+=+System.getProperty("java.home")+%2B+separator+%2B+"bin"+%2B+separator+%2B+"java.exe";
String+jar_wrapper+=+"path\\of\\wrapper.jar";

String[]+args+=+new+String[]{java,+"-cp",+jar_wrapper,+"com.panayotis.wrapper.Main",+actual_exec_args...);|1031665|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I believe the only portable way to do this, is to run a (child) process through another (parent) Java process, which will inform me the actual PID of the parent process. The child process could be anything.

The code of this wrapper is

<pre><code>package com.panayotis.wrapper;

import java.io.File;
import java.io.IOException;
import java.lang.management.ManagementFactory;

public class Main {
 public static void main(String[] args) throws IOException, InterruptedException {
 System.out.println(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);
 ProcessBuilder pb = new ProcessBuilder(args);
 pb.directory(new File(System.getProperty("user.dir")));
 pb.redirectInput(ProcessBuilder.Redirect.INHERIT);
 pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
 pb.redirectError(ProcessBuilder.Redirect.INHERIT);
 pb.start().waitFor();
 }
}
</code></pre>

To use it, create a jar file with just this one, and call it with command arguments this:

<pre><code>String java = System.getProperty("java.home") + separator + "bin" + separator + "java.exe";
String jar_wrapper = "path\\of\\wrapper.jar";

String[] args = new String[]{java, "-cp", jar_wrapper, "com.panayotis.wrapper.Main", actual_exec_args...);
</code></pre>

blocks|key|1031759|text|如果可移植性不是一个问题，而你只想在Windows上没有太多麻烦地获得pid，同时使用经过测试和已知可以在所有现代版本的Windows上运行的代码，你可以使用kohsuke的winp库。它还可以在Maven+Central上使用，以方便使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1031760|Process+process+=+//...;
WinProcess+wp+=+new+WinProcess(process);
int+pid+=+wp.getPid();|code-block|syntax|javascript|1031761|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/kohsuke/winp^0|2F|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If portability is not a concern, and you just want to get the pid on Windows without a lot of hassle while using code that is tested and known to work on all modern versions of Windows, you can use kohsuke's <a href="https://github.com/kohsuke/winp" rel="nofollow noreferrer">winp</a> library. It is also available on Maven Central for easy consumption.

<pre><code>Process process = //...;
WinProcess wp = new WinProcess(process);
int pid = wp.getPid();
</code></pre>

blocks|key|816963|text|有一个开源库就有这样的功能，而且它有跨平台的实现：https://github.com/OpenHFT/Java-Thread-Affinity|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|816964|仅仅获取PID可能有些夸张，但如果您想要其他东西，如CPU和线程id，特别是线程亲和性，它可能就足够了。|816965|要获取当前线程的PID，只需调用Affinity.getAffinityImpl().getProcessId()。|style|CODE|816966|这是使用JNA实现的(参见arcsin的答案)。|816967|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/OpenHFT/Java-Thread-Affinity^0|P|1B|0|0|0|G|15|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Y|8|@$A|Z|B|10|H|I]]|9|@]|C|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]]]

There is an open-source library that has such a function, and it has cross-platform implementations: <a href="https://github.com/OpenHFT/Java-Thread-Affinity" rel="nofollow noreferrer">https://github.com/OpenHFT/Java-Thread-Affinity</a>

It may be overkill just to get the PID, but if you want other things like CPU and thread id, and specifically thread affinity, it may be adequate for you.

To get the current thread's PID, just call <code>Affinity.getAffinityImpl().getProcessId()</code>.

This is implemented using JNA (see arcsin's answer).

blocks|key|1031880|text|这不是一个通用的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1031881|但是:一些程序，特别是服务和长时间运行的程序，会创建(或提供可选的)+"pid文件“。|1031882|例如，LibreOffice提供了--pidfile={file}，请参阅docs。|offset|length|style|CODE|1031883|我一直在寻找Java/Linux解决方案，但是PID+(就我而言)就在手边。|1031884|entityMap|0|LINK|mutability|MUTABLE|url|https://help.libreoffice.org/5.4/he/text/shared/guide/start_parameters.html^0|0|0|H|G|11|4|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@$F|W|G|X|H|I]]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

This is not a generic answer.

However: Some programs, especially services and long-running programs, create (or offer to create, optionally) a "pid file".

For instance, LibreOffice offers <code>--pidfile={file}</code>, see the <a href="https://help.libreoffice.org/5.4/he/text/shared/guide/start_parameters.html" rel="nofollow noreferrer">docs</a>.

I was looking for quite some time for a Java/Linux solution but the PID was (in my case) lying at hand.

blocks|key|817076|text|对于GNU/Linux+&+MacOS+(或一般类UNIX+)系统，我使用了以下方法，它工作得很好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|817077|private+int+tryGetPid(Process+process)
{
++++if+(process.getClass().getName().equals("java.lang.UNIXProcess"))
++++{
++++++++try
++++++++{
++++++++++++Field+f+=+process.getClass().getDeclaredField("pid");
++++++++++++f.setAccessible(true);
++++++++++++return+f.getInt(process);
++++++++}
++++++++catch+(IllegalAccessException+%7C+IllegalArgumentException+%7C+NoSuchFieldException+%7C+SecurityException+e)
++++++++{
++++++++}
++++}

++++return+0;
}|code-block|syntax|javascript|817078|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For GNU/Linux &amp; MacOS (or generally UNIX like) systems, I've used below method which works fine:

<pre><code>private int tryGetPid(Process process)
{
 if (process.getClass().getName().equals("java.lang.UNIXProcess"))
 {
 try
 {
 Field f = process.getClass().getDeclaredField("pid");
 f.setAccessible(true);
 return f.getInt(process);
 }
 catch (IllegalAccessException | IllegalArgumentException | NoSuchFieldException | SecurityException e)
 {
 }
 }

 return 0;
}
</code></pre>

blocks|key|817139|text|使用JNA，支持新旧JVM获取进程id|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|817140|public+static+long+getProcessId(Process+p){
++++long+pid+=+-1;
++++try+{
++++++pid+=+p.pid();
++++}+catch+(NoSuchMethodError+e)+{
++++++++try
++++++++{
++++++++++++//for+windows
++++++++++++if+(p.getClass().getName().equals("java.lang.Win32Process")+%7C%7C+p.getClass().getName().equals("java.lang.ProcessImpl"))+{
++++++++++++++++Field+f+=+p.getClass().getDeclaredField("handle");
++++++++++++++++f.setAccessible(true);++++++++++++++
++++++++++++++++long+handl+=+f.getLong(p);
++++++++++++++++Kernel32+kernel+=+Kernel32.INSTANCE;
++++++++++++++++WinNT.HANDLE+hand+=+new+WinNT.HANDLE();
++++++++++++++++hand.setPointer(Pointer.createConstant(handl));
++++++++++++++++pid+=+kernel.GetProcessId(hand);
++++++++++++++++f.setAccessible(false);
++++++++++++}
++++++++++++//for+unix+based+operating+systems
++++++++++++else+if+(p.getClass().getName().equals("java.lang.UNIXProcess"))+
++++++++++++{
++++++++++++++++Field+f+=+p.getClass().getDeclaredField("pid");
++++++++++++++++f.setAccessible(true);
++++++++++++++++pid+=+f.getLong(p);
++++++++++++++++f.setAccessible(false);
++++++++++++}
++++++++}
++++++++catch(Exception+ex)
++++++++{
++++++++++++pid+=+-1;
++++++++}
++++}++++++++
++++return+pid;
}|code-block|syntax|javascript|817141|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/java-native-access/jna^0|2|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Using <a href="https://github.com/java-native-access/jna" rel="nofollow noreferrer">JNA</a>, supporting old and new JVM to get process id

<pre><code>public static long getProcessId(Process p){
 long pid = -1;
 try {
 pid = p.pid();
 } catch (NoSuchMethodError e) {
 try
 {
 //for windows
 if (p.getClass().getName().equals("java.lang.Win32Process") || p.getClass().getName().equals("java.lang.ProcessImpl")) {
 Field f = p.getClass().getDeclaredField("handle");
 f.setAccessible(true); 
 long handl = f.getLong(p);
 Kernel32 kernel = Kernel32.INSTANCE;
 WinNT.HANDLE hand = new WinNT.HANDLE();
 hand.setPointer(Pointer.createConstant(handl));
 pid = kernel.GetProcessId(hand);
 f.setAccessible(false);
 }
 //for unix based operating systems
 else if (p.getClass().getName().equals("java.lang.UNIXProcess")) 
 {
 Field f = p.getClass().getDeclaredField("pid");
 f.setAccessible(true);
 pid = f.getLong(p);
 f.setAccessible(false);
 }
 }
 catch(Exception ex)
 {
 pid = -1;
 }
 } 
 return pid;
}
</code></pre>

blocks|key|1032029|text|我为那些仍然坚持使用Java8的人做了一个快速而肮脏的解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1032030|public+long+showID(Process+process)+{
++++return+Long.parseLong(process.toString().split(",+")[0].replace("Process[pid=",+""));
}|code-block|syntax|javascript|1032031|我希望这段代码对您有用。|1032032|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I made a quick and dirty solution for those who are still stuck with Java 8
<pre><code>public long showID(Process process) {
 return Long.parseLong(process.toString().split(&quot;, &quot;)[0].replace(&quot;Process[pid=&quot;, &quot;&quot;));
}
</code></pre>
I hope you find this snippet useful.

I've started a process with following code

<pre><code> ProcessBuilder pb = new ProcessBuilder("cmd", "/c", "path");
 try {
 Process p = pb.start(); 
 } 
 catch (IOException ex) {}
</code></pre>

Now I need to know the process's pid that I've just started.

How to get PID of process I've just started within java program?

Windows

Linux

MacOS

Java

Unix

我使用以下代码启动了一个进程 ProcessBuilder pb = new ProcessBuilder("cmd", "/c", "path"); try {     Process p = pb.start();        }  catch (IOException ex) {}现在我需要知道我刚刚启动的进程...

问如何在java程序中获取刚启动的进程的PID？
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