How to get a list of current open windows process with Java

Question

Does any one know how do I get the current open windows or process of a local machine using Java     What I m trying to do is  list the current open task  windows or process open  like in  Windows Taskmanager  but using a multi-platform approach - using only Java if it s possible

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YAJSW  Yet Another Java Service Wrapper  looks like it has JNA-based implementations of its org rzo yajsw os TaskList interface for win32  linux  bsd and solaris and is under an LGPL license   I haven t tried calling this code directly  but YAJSW works really well when I ve used it in the past  so you shouldn t have too many worries

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For windows I use following   Process process   new ProcessBuilder  tasklist exe     fo    csv     nh   start    new Thread    - gt        Scanner sc   new Scanner process getInputStream         if  sc hasNextLine    sc nextLine        while  sc hasNextLine              String line   sc nextLine            String   parts   line split               String unq   parts 0  substring 1  replaceFirst                    String pid   parts 1  substring 1  replaceFirst                    System out println unq         pid            start    process waitFor    System out println  Done

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This is another approach to parse the the process list from the command  ps -e    try       String line      Process p   Runtime getRuntime   exec  ps -e        BufferedReader input               new BufferedReader new InputStreamReader p getInputStream          while   line   input readLine       null            System out println line      lt -- Parse data here            input close      catch  Exception err        err printStackTrace        If you are using Windows  then you should change the line   Process p   Runtime getRun     etc     3rd line   for one that looks like this   Process p   Runtime getRuntime   exec      System getenv  windir       system32     tasklist exe      Hope the info helps

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You can easily retrieve the list of running processes using jProcesses  List lt ProcessInfo gt  processesList   JProcesses getProcessList     for  final ProcessInfo processInfo   processesList        System out println  Process PID      processInfo getPid         System out println  Process Name      processInfo getName         System out println  Process Used Time      processInfo getTime         System out println  Full command      processInfo getCommand         System out println  ------------------

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On Windows there is an alternative using JNA   import com sun jna Native  import com sun jna platform win32    import com sun jna win32 W32APIOptions   public class ProcessList        public static void main String   args            WinNT winNT    WinNT  Native loadLibrary WinNT class  W32APIOptions UNICODE OPTIONS            WinNT HANDLE snapshot   winNT CreateToolhelp32Snapshot Tlhelp32 TH32CS SNAPPROCESS  new WinDef DWORD 0             Tlhelp32 PROCESSENTRY32 ByReference processEntry   new Tlhelp32 PROCESSENTRY32 ByReference             while  winNT Process32Next snapshot  processEntry                 System out println processEntry th32ProcessID     t    Native toString processEntry szExeFile                       winNT CloseHandle snapshot

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package com vipul   import java applet Applet  import java awt Checkbox  import java awt Choice  import java awt Font  import java io BufferedReader  import java io IOException  import java io InputStream  import java io InputStreamReader  import java util ArrayList  import java util List   public class BatchExecuteService extends Applet       public Choice choice       public void init                  setFont new Font  Helvetica   Font BOLD  36            choice   new Choice               public static void main String   args            BatchExecuteService batchExecuteService   new BatchExecuteService            batchExecuteService run               List lt String gt  processList   new ArrayList lt String gt          public void run             try               Runtime runtime   Runtime getRuntime                Process process   runtime exec  D   server bat                process getOutputStream   close                InputStream inputStream   process getInputStream                InputStreamReader inputstreamreader   new InputStreamReader                      inputStream               BufferedReader bufferedrReader   new BufferedReader                      inputstreamreader               BufferedReader bufferedrReader1   new BufferedReader                      inputstreamreader                String strLine                   String x   new String 100               int i 0              int t 0              while   strLine   bufferedrReader readLine       null                                 System out println strLine                   String   a strLine split                       x i    a 0                             System out println  Length     i                for int j 2 j lt i j                                  System out println x j                                    catch  IOException ioException                         ioException printStackTrace                             You can create batch file like        TASKLIST  v  FI  STATUS eq running   FO  CSV   FI  Username eq LHPL002 soft    FI  MEMUSAGE gt 10000    FI  Windowtitle ne N A   NH

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There is no platform-neutral way of doing this  In the 1 6 release of Java  a  Desktop  class was added the allows portable ways of browsing  editing  mailing  opening  and printing URI s  It is possible this class may someday be extended to support processes  but I doubt it   If you are only curious in Java processes  you can use the java lang management api for getting thread memory information on the JVM

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The only way I can think of doing it is by invoking a command line application that does the job for you and then screenscraping the output  like Linux s ps and Window s tasklist     Unfortunately  that ll mean you ll have to write some parsing routines to read the data from both   Process proc   Runtime getRuntime   exec   tasklist exe    InputStream procOutput   proc getInputStream     if  0    proc waitFor              TODO scan the procOutput for your data

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This is my code for a function that gets the tasks and gets their names  also adding them into a list to be accessed from a list  It creates temp files with the data  reads the files and gets the task name with the  exe suffix  and arranges the files to be deleted when the program has exited with System exit 0   it also hides the processes being used to get the tasks and also java exe so that the user can t accidentally kill the process that runs the program all together   private static final DefaultListModel tasks   new DefaultListModel     public static void getTasks         new Thread                  Override         public void run                         try                                File batchFile   File createTempFile  batchFile     bat                    File logFile   File createTempFile  log     txt                    String logFilePath   logFile getAbsolutePath                    try  PrintWriter fileCreator   new PrintWriter batchFile                                          String   linesToPrint      echo off    tasklist exe  gt  gt     logFilePath   exit                        for String string linesToPrint                                                fileCreator println string                                             fileCreator close                                      int task   Runtime getRuntime   exec batchFile getAbsolutePath    waitFor                    if task    0                                        FileReader fileOpener   new FileReader logFile                       try  BufferedReader reader   new BufferedReader fileOpener                                                 String line                          while true                                                        line   reader readLine                                if line    null                                                                if line endsWith  K                                                                          if line contains   exe                                                                                  int index   line lastIndexOf   exe   line length                                             String taskName   line substring 0  index   4                                           if   taskName equals  tasklist exe    amp  amp    taskName equals  cmd exe    amp  amp    taskName equals  java exe                                                                                          tasks addElement taskName                                                                                                                                                                               else                                                               reader close                                    break                                                                                                                  batchFile deleteOnExit                    logFile deleteOnExit                               catch  FileNotFoundException ex                                 Logger getLogger Functions class getName    log Level SEVERE  null  ex                              catch  IOException   InterruptedException ex                                 Logger getLogger Functions class getName    log Level SEVERE  null  ex                             catch  NullPointerException ex                                   This stops errors from being thrown on an empty line                               start       public static void killTask String taskName        new Thread                  Override         public void run                         try                                Runtime getRuntime   exec  taskkill exe  IM     taskName                              catch  IOException ex                                 Logger getLogger Functions class getName    log Level SEVERE  null  ex                                 start

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x000D   x000D      String line  x000D      Process process   Runtime getRuntime   exec  ps -e    x000D      process getOutputStream   close    x000D      BufferedReader input   x000D              new BufferedReader new InputStreamReader process getInputStream      x000D      while   line   input readLine       null    x000D          System out println line      lt -- Parse data here  x000D        x000D      input close    x000D   x000D   x000D    We have to use process getOutputStream close   otherwise it will get locked in while loop

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Finally  with Java 9  it is possible with ProcessHandle   public static void main String   args        ProcessHandle allProcesses                forEach process - gt  System out println processDetails process        private static String processDetails ProcessHandle process        return String format   8d  8s  10s  26s  -40s               process pid                text process parent   map ProcessHandle  pid                text process info   user                 text process info   startInstant                 text process info   commandLine         private static String text Optional lt   gt  optional        return optional map Object  toString  orElse  -        Output        1        -       root   2017-11-19T18 01 13 100Z  sbin init         639     1325   www-data   2018-12-04T06 35 58 680Z  usr sbin apache2 -k start       23082    11054    huguesm   2018-12-04T10 24 22 100Z      java ProcessListDemo

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Using code to parse ps aux for linux and tasklist for windows are your best options  until something more general comes along   For windows  you can reference  http   www rgagnon com javadetails java-0593 html  Linux can pipe the results of ps aux through grep too  which would make processing searching quick and easy  I m sure you can find something similar for windows too

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The below program will be compatible with Java 9  version only     To get the CurrentProcess information   public class CurrentProcess       public static void main String   args            ProcessHandle handle   ProcessHandle current            System out println  Current Running Process Id    handle pid             ProcessHandle Info info   handle info            System out println  ProcessHandle Info     info             For all running processes   import java util List  import java util stream Collectors   public class AllProcesses       public static void main String   args            ProcessHandle allProcesses   forEach processHandle - gt                System out println processHandle pid       processHandle info

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This might be useful for apps with a bundled JRE  I scan for the folder name that i m running the application from  so if you re application is executing from   C  Dev build SomeJavaApp jre-9 0 1 bin javaw exe   then you can find if it s already running in J9  by   public static void main String   args        AtomicBoolean isRunning   new AtomicBoolean false       ProcessHandle allProcesses                filter ph - gt  ph info   command   isPresent    amp  amp  ph info   command   get   contains  SomeJavaApp                 forEach  process  - gt                    isRunning set true                       if  isRunning get    System out println  SomeJavaApp is running already

[java] How to get a list of current open windows/process with Java?

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