How to run a command in unix shell and then get the output back from/to java application

Question

I know how to execute a shell command from my java app. It should be something like:

String command = "java -version";
Process proc = null;
try {
  proc = Runtime.getRuntime().exec(command);
}
catch (IOException e) {
System.out.print(e);
}

I want to get the output of this command back to my java app, without printing the output to some temporary file which I then read from my app. Is this possible?

RamonBoza · Accepted Answer · 2013-10-16 12:25:25Z

3

You need to use ProcessBuilder

Process process = new ProcessBuilder(
"C:\\PathToExe\\exe.exe","param1","param2").start();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;

System.out.printf("Output of running %s is:", Arrays.toString(args));

while ((line = br.readLine()) != null) {
  System.out.println(line);
}

code that is already found on stackoverflow Execute external program in java

answered Oct 16, 2013 at 12:25

RamonBoza

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1 Comment

Ernest Friedman-Hill Over a year ago

Note that processbuilder has nothing at all to do with the solution, which is simply to use the getinputstream method in the process class.

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