[ Java 常見問題 ] How to get PID from Process in Java

Source From Here 
Preface 
A node from http://bugs.sun.com/view_bug.do?bug_id=4244896 

How 
On Linux: 

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1. if(process.getClass().getName().equals("java.lang.UNIXProcess")) {  
2.   /* get the PID on unix/linux systems */  
3.   try {  
4.     Field f = process.getClass().getDeclaredField("pid");  
5.     f.setAccessible(true);  
6.     pid = f.getInt(p);  
7.   } catch (Throwable e) {  
8.   }  
9. }  

On Windows: 
Download the jna.jar on Suns JNA Site: 

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1. if (process.getClass().getName().equals("java.lang.Win32Process") ||  
2.        process.getClass().getName().equals("java.lang.ProcessImpl")) {  
3.   /* determine the pid on windows plattforms */  
4.   try {  
5.     Field f = p.getClass().getDeclaredField("handle");  
6.     f.setAccessible(true);                
7.     long handl = f.getLong(p);  
8.       
9.     Kernel32 kernel = Kernel32.INSTANCE;  
10.     W32API.HANDLE handle = new W32API.HANDLE();  
11.     handle.setPointer(Pointer.createConstant(handl));  
12.     pid = kernel.GetProcessId(handle);  
13.   } catch (Throwable e) {                 
14.   }  
15. }  

Supplement 
* Stackoferflow - How to execute a interactive shell script using java Runtime?