Java run Windows command line command returning a value

Question

I would like to run a windows command line command from java and return the result into java. Is this possible?

for example, I would like to do the following

Object returnValue = runOnCommandLine("wmic cpu get LoadPercentage"); //In this case, returnValue is the cpu load percent as a String

Edit: I was able to get this working

InputStream inputStream = new ProcessBuilder("wmic", "cpu", "get", "status").start().getInputStream();
StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer);
String theString = writer.toString();
System.out.println("My string: " + theString);

It take a look at this and this and this

MadProgrammer
– MadProgrammer

2013-02-06 20:44:34 +00:00
Commented Feb 6, 2013 at 20:44 — MadProgrammer
– MadProgrammer, Commented Feb 6, 2013 at 20:44
Or check out javaevangelist.blogspot.nl/2011/12/…

Sebastiaan van den Broek
– Sebastiaan van den Broek

2013-02-06 20:47:51 +00:00
Commented Feb 6, 2013 at 20:47 — Sebastiaan van den Broek
– Sebastiaan van den Broek, Commented Feb 6, 2013 at 20:47

Andrey Svirsky · Accepted Answer · 2013-02-06 20:57:52Z

2

Data you need is commandOutput.

    String cmd = "wmic cpu get LoadPercentage";
    ProcessBuilder pb = new ProcessBuilder(cmd);
    pb.redirectErrorStream(true);
    Process p = pb.start();
    BufferedReader stdin = new BufferedReader(
                          new InputStreamReader(p.getInputStream()));
    StringBuilder commandOutput = new StringBuilder();
    String line;
    while ((line = stdin.readLine()) != null) {
      commandOutput.append(line);
    }
    int exitValue = -1;
    try {
     exitValue = p.waitFor();
    } catch (InterruptedException e) {
    // do something here   
    }

answered Feb 6, 2013 at 20:57

Andrey Svirsky

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Comments

buxter · Accepted Answer · 2013-02-06 21:06:16Z

0

You could do the following:

        Process proc = Runtime.getRuntime().exec("net start");          
        InputStreamReader isr = new InputStreamReader(proc.getInputStream());
        BufferedReader br = new BufferedReader(isr);

        String temp = null;
        while (( temp = br.readLine() ) != null)
               System.out.println(temp);

answered Feb 6, 2013 at 21:06

buxter

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Comments

qkrijger · Accepted Answer · 2014-05-21 15:29:22Z

0

Take a look into ProcessBuilder.

Below Java 1.5 Runtime.getRuntime().exec(...) was used.

edited May 21, 2014 at 15:29

qkrijger

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answered Feb 6, 2013 at 20:36

thatidiotguy

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2 Comments

MadProgrammer Over a year ago

Much easier to use ProcessBuilder - solves many of the common mistakes people make with Runtime#exec - IMHO

thatidiotguy Over a year ago

@MadProgrammer It appears Oracle says the same thing in the docs. ProcessBuilder is preferred in 1.5 and above. Thanks for the info.

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