blocks|key|1775959|text|这取决于你从哪里寻找信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1775960|如果您要从控制台查找信息，可以使用jps命令。该命令给出的输出类似于Unix+ps命令，并且随JDK一起提供，因为我相信1.5|1775961|如果您从流程的角度来看，RuntimeMXBean+(正如Wouter+Coekaerts所说)可能是您的最佳选择。在使用SunJDK1.6+u7的Windows上，getName()的输出格式为PROCESS_ID@MACHINE_NAME。但是，您可以尝试执行jps并解析其中的结果：|1775962|String+jps+=+[JDK+HOME]+%2B+"\\bin\\jps.exe";
Process+p+=+Runtime.getRuntime().exec(jps);|code-block|syntax|javascript|1775963|如果不带选项运行，输出应该是进程id后跟名称。|1775964|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It depends on where you are looking for the information from.

If you are looking for the information from the console you can use the jps command. The command gives output similar to the Unix ps command and comes with the JDK since I believe 1.5

If you are looking from the process the RuntimeMXBean (as said by Wouter Coekaerts) is probably your best choice. The output from getName() on Windows using Sun JDK 1.6 u7 is in the form [PROCESS_ID]@[MACHINE_NAME]. You could however try to execute jps and parse the result from that:

<pre><code>String jps = [JDK HOME] + "\\bin\\jps.exe";
Process p = Runtime.getRuntime().exec(jps);
</code></pre>

If run with no options the output should be the process id followed by the name.

blocks|key|1560866|text|您可以在GitHub上查看我的项目：JavaSysMon。它提供进程id和一堆其他的东西(CPU使用率，内存使用率)跨平台(目前是Windows，Mac，Linux和Solaris)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1560867|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/jezhumble/javasysmon/^0|I|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can check out my project: <a href="http://github.com/jezhumble/javasysmon/" rel="noreferrer">JavaSysMon</a> on GitHub. It provides process id and a bunch of other stuff (CPU usage, memory usage) cross-platform (presently Windows, Mac OSX, Linux and Solaris)

blocks|key|1776050|text|试试Sigar。非常广泛的API。Apache+2许可证。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1776051|private+Sigar+sigar;

public+synchronized+Sigar+getSigar()+{
++++if+(sigar+==+null)+{
++++++++sigar+=+new+Sigar();
++++}
++++return+sigar;
}

public+synchronized+void+forceRelease()+{
++++if+(sigar+!=+null)+{
++++++++sigar.close();
++++++++sigar+=+null;
++++}
}

public+long+getPid()+{
++++return+getSigar().getPid();
}|code-block|syntax|javascript|1776052|entityMap|0|LINK|mutability|MUTABLE|url|http://support.hyperic.com/display/SIGAR/Home^0|2|5|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]]]]

Try <a href="http://support.hyperic.com/display/SIGAR/Home" rel="nofollow noreferrer">Sigar</a> . very extensive APIs. Apache 2 license.

<pre class="lang-java prettyprint-override"><code>private Sigar sigar;

public synchronized Sigar getSigar() {
 if (sigar == null) {
 sigar = new Sigar();
 }
 return sigar;
}

public synchronized void forceRelease() {
 if (sigar != null) {
 sigar.close();
 sigar = null;
 }
}

public long getPid() {
 return getSigar().getPid();
}
</code></pre>

blocks|key|1776092|text|对于较旧的JVM，在linux中...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1776093|private+static+String+getPid()+throws+IOException+{
++++byte[]+bo+=+new+byte[256];
++++InputStream+is+=+new+FileInputStream("/proc/self/stat");
++++is.read(bo);
++++for+(int+i+=+0;+i+<+bo.length;+i%2B%2B)+{
++++++++if+((bo[i]+<+'0')+%7C%7C+(bo[i]+>+'9'))+{
++++++++++++return+new+String(bo,+0,+i);
++++++++}
++++}
++++return+"-1";
}|code-block|syntax|javascript|1776094|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 older JVM, in linux...

<pre><code>private static String getPid() throws IOException {
 byte[] bo = new byte[256];
 InputStream is = new FileInputStream("/proc/self/stat");
 is.read(bo);
 for (int i = 0; i &lt; bo.length; i++) {
 if ((bo[i] &lt; '0') || (bo[i] &gt; '9')) {
 return new String(bo, 0, i);
 }
 }
 return "-1";
}
</code></pre>

blocks|key|1560988|text|下面的方法尝试从java.lang.management.ManagementFactory中提取PID|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1560989|private+static+String+getProcessId(final+String+fallback)+{
++++//+Note:+may+fail+in+some+JVM+implementations
++++//+therefore+fallback+has+to+be+provided

++++//+something+like+'<pid>@<hostname>',+at+least+in+SUN+/+Oracle+JVMs
++++final+String+jvmName+=+ManagementFactory.getRuntimeMXBean().getName();
++++final+int+index+=+jvmName.indexOf('@');

++++if+(index+<+1)+{
++++++++//+part+before+'@'+empty+(index+=+0)+/+'@'+not+found+(index+=+-1)
++++++++return+fallback;
++++}

++++try+{
++++++++return+Long.toString(Long.parseLong(jvmName.substring(0,+index)));
++++}+catch+(NumberFormatException+e)+{
++++++++//+ignore
++++}
++++return+fallback;
}|code-block|syntax|javascript|1560990|例如，只要调用getProcessId("<PID>")即可。|1560991|entityMap^0|8|12|0|0|7|L|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

The following method tries to extract the PID from <code>java.lang.management.ManagementFactory</code>:

<pre><code>private static String getProcessId(final String fallback) {
 // Note: may fail in some JVM implementations
 // therefore fallback has to be provided

 // something like '&lt;pid&gt;@&lt;hostname&gt;', at least in SUN / Oracle JVMs
 final String jvmName = ManagementFactory.getRuntimeMXBean().getName();
 final int index = jvmName.indexOf('@');

 if (index &lt; 1) {
 // part before '@' empty (index = 0) / '@' not found (index = -1)
 return fallback;
 }

 try {
 return Long.toString(Long.parseLong(jvmName.substring(0, index)));
 } catch (NumberFormatException e) {
 // ignore
 }
 return fallback;
}
</code></pre>

Just call <code>getProcessId("&lt;PID&gt;")</code>, for instance.

blocks|key|1776204|text|当我有类似的需求时，这是我使用的。这将正确地确定Java进程的PID。让您的java代码在预定义的端口号上生成一个服务器，然后执行OS命令来找出侦听该端口的PID。对于Linux|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1776205|netstat+-tupln+%7C+grep+portNumber|code-block|syntax|javascript|1776206|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|$]]

This is what I used when I had similar requirement. This determines the PID of the Java process correctly. Let your java code spawn a server on a pre-defined port number and then execute OS commands to find out the PID listening on the port. For Linux

<pre><code>netstat -tupln | grep portNumber
</code></pre>

blocks|key|1561101|text|基于Ashwin+Jayaprakash关于Apache2.0许可SIGAR的answer+(%2B1)，下面是我如何使用它来仅获取当前进程的PID：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1561102|import+org.hyperic.sigar.Sigar;

Sigar+sigar+=+new+Sigar();
long+pid+=+sigar.getPid();
sigar.close();|code-block|syntax|javascript|1561103|尽管它不能在所有平台上工作，但它确实可以在Linux,+Windows,+OS+X+and+various+Unix+platforms+as+listed+here上工作。|1561104|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/3134967/246622|1|https://support.hyperic.com/display/SIGAR/Home#Home-overview^0|X|5|13|6|0|0|0|L|1Q|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|M|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

Based on Ashwin Jayaprakash's <a href="https://stackoverflow.com/a/3134967/246622">answer</a> (+1)
about the Apache 2.0 licensed <code>SIGAR</code>, here is how I use it to get only the PID of the current process:

<pre><code>import org.hyperic.sigar.Sigar;

Sigar sigar = new Sigar();
long pid = sigar.getPid();
sigar.close();
</code></pre>

Even though it does not work on all platforms, it does work on <a href="https://support.hyperic.com/display/SIGAR/Home#Home-overview" rel="nofollow noreferrer">Linux, Windows, OS X and various Unix platforms as listed here</a>.

blocks|key|1561173|text|您可以在JNR-Posix中尝试使用getpid()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1561174|它有一个从libc调用getpid()的Windows+POSIX包装器。|1561175|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/jnr/jnr-posix^0|I|8|4|9|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

You can try <code>getpid()</code> in <a href="https://github.com/jnr/jnr-posix" rel="nofollow">JNR-Posix</a>. 

It has a Windows POSIX wrapper that calls getpid() off of libc.

blocks|key|1561218|text|我知道这是一个很老的线程，但我想指出，用于获取PID+(以及运行时对Java进程的其他操作)的API正在添加到JDK9中的process类中：http://openjdk.java.net/jeps/102|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1561219|entityMap|0|LINK|mutability|MUTABLE|url|http://openjdk.java.net/jeps/102^0|1Z|W|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I know this is an old thread, but I wanted to call out that API for getting the PID (as well as other manipulation of the Java process at runtime) is being added to the Process class in JDK 9: <a href="http://openjdk.java.net/jeps/102" rel="nofollow">http://openjdk.java.net/jeps/102</a>

blocks|key|1776444|text|从Java9开始，就有了Process.getPid()方法，它返回进程的本机ID：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1776445|public+abstract+class+Process+{

++++...

++++public+long+getPid();
}|code-block|syntax|javascript|1776446|要获取当前Java进程的进程ID，可以使用ProcessHandle接口：|offset|length|style|CODE|1776447|System.out.println(ProcessHandle.current().pid());|1776448|entityMap^0|0|0|L|D|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Since Java 9 there is a method Process.getPid() which returns the native ID of a process:

<pre><code>public abstract class Process {

 ...

 public long getPid();
}
</code></pre>

To get the process ID of the current Java process one can use the <code>ProcessHandle</code> interface:

<pre><code>System.out.println(ProcessHandle.current().pid());
</code></pre>

blocks|key|1561311|text|以下是我的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561312|public+static+boolean+isPIDInUse(int+pid)+{

++++++++try+{

++++++++++++String+s+=+null;
++++++++++++int+java_pid;

++++++++++++RuntimeMXBean+rt+=+ManagementFactory.getRuntimeMXBean();
++++++++++++java_pid+=+Integer.parseInt(rt.getName().substring(0,+rt.getName().indexOf("@")));

++++++++++++if+(java_pid+==+pid)+{
++++++++++++++++System.out.println("In+Use\n");
++++++++++++++++return+true;
++++++++++++}
++++++++}+catch+(Exception+e)+{
++++++++++++System.out.println("Exception:++"+%2B+e.getMessage());
++++++++}
++++++++return+false;
++++}|code-block|syntax|javascript|1561313|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|$]]

Here is my solution:

<pre><code>public static boolean isPIDInUse(int pid) {

 try {

 String s = null;
 int java_pid;

 RuntimeMXBean rt = ManagementFactory.getRuntimeMXBean();
 java_pid = Integer.parseInt(rt.getName().substring(0, rt.getName().indexOf("@")));

 if (java_pid == pid) {
 System.out.println("In Use\n");
 return true;
 }
 } catch (Exception e) {
 System.out.println("Exception: " + e.getMessage());
 }
 return false;
 }
</code></pre>

blocks|key|1561370|text|在Scala中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561371|import+sys.process._
val+pid:+Long+=+Seq("sh",+"-c",+"echo+$PPID").!!.trim.toLong|code-block|syntax|javascript|1561372|在Java+9发布之前，这将为您在Unix系统上提供一个变通方法。(我知道，这个问题是关于Java的，但由于Scala没有类似的问题，所以我想把这个问题留给可能会遇到相同问题的Scala用户。)|1561373|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|$]]

In Scala:

<pre><code>import sys.process._
val pid: Long = Seq("sh", "-c", "echo $PPID").!!.trim.toLong
</code></pre>

This should give you a workaround on Unix systems until Java 9 will be released.
(I know, the question was about Java, but since there is no equivalent question for Scala, I wanted to leave this for Scala users who might stumble into the same question.)

blocks|key|1776519|text|public+static+long+getPID()+{
++++String+processName+=+java.lang.management.ManagementFactory.getRuntimeMXBean().getName();
++++if+(processName+!=+null+&&+processName.length()+>+0)+{
++++++++try+{
++++++++++++return+Long.parseLong(processName.split("@")[0]);
++++++++}
++++++++catch+(Exception+e)+{
++++++++++++return+0;
++++++++}
++++}

++++return+0;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1776520|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static long getPID() {
 String processName = java.lang.management.ManagementFactory.getRuntimeMXBean().getName();
 if (processName != null &amp;&amp; processName.length() &gt; 0) {
 try {
 return Long.parseLong(processName.split("@")[0]);
 }
 catch (Exception e) {
 return 0;
 }
 }

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

blocks|key|1776532|text|java.lang.management.ManagementFactory.getRuntimeMXBean().getName().split("@")[0]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1776533|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>java.lang.management.ManagementFactory.getRuntimeMXBean().getName().split("@")[0]
</code></pre>

blocks|key|1561457|text|除了其他解决方案之外，我还添加了这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561458|在Java10中，要获得process+id|offset|length|style|CODE|1561459|final+RuntimeMXBean+runtime+=+ManagementFactory.getRuntimeMXBean();
final+long+pid+=+runtime.getPid();
out.println("Process+ID+is+'"+%2B+pid);|code-block|syntax|javascript|1561460|entityMap^0|0|C|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I am adding this, in addition to other solutions.
<h2>with Java 10, to get <code>process id</code></h2>
<pre><code>final RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
final long pid = runtime.getPid();
out.println(&quot;Process ID is '&quot; + pid);
</code></pre>

blocks|key|1776672|text|我找到了一个解决方案，可能有点边缘情况，我没有在Windows10以外的其他操作系统上尝试过，但我认为它值得注意。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1776673|如果您发现自己在使用J2V8和nodejs，可以运行一个简单的javascript函数，返回java进程的pid。|offset|length|1776674|下面是一个示例：|1776675|public+static+void+main(String[]+args)+{
++++NodeJS+nodeJS+=+NodeJS.createNodeJS();
++++int+pid+=+nodeJS.getRuntime().executeIntegerScript("process.pid;\n");
++++System.out.println(pid);
++++nodeJS.release();
}|code-block|syntax|javascript|1776676|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/eclipsesource/J2V8^0|0|A|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I found a solution that may be a bit of an edge case and I didn't try it on other OS than Windows 10, but I think it's worth noticing.

If you find yourself working with <a href="https://github.com/eclipsesource/J2V8" rel="nofollow noreferrer">J2V8</a> and nodejs, you can run a simple javascript function returning you the pid of the java process.

Here is an example:

<pre><code>public static void main(String[] args) {
 NodeJS nodeJS = NodeJS.createNodeJS();
 int pid = nodeJS.getRuntime().executeIntegerScript("process.pid;\n");
 System.out.println(pid);
 nodeJS.release();
}
</code></pre>

How do I get the id of my Java process? 

I know there are several platform-dependent hacks, but I would prefer a more generic solution.

How can a Java program get its own process ID?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何获取Java进程的id？我知道有几种依赖于平台的黑客攻击，但我更喜欢更通用的解决方案。

问Java程序如何获取自己的进程ID？
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