display the output-stream of a Process returned by Runtime.exec()

Question

How do I print to stdout the output string obtained executing a command?

So Runtime.getRuntime().exec() would return a Process , and by calling getOutputStream() , I can obtain the object as follows, but how do I display the content of it to stdout?

OutputStream out = Runtime.getRuntime().exec("ls").getOutputStream();

Thanks

Answer 1

I believe you are trying to get the output from process, and for that you should get the InputStream .

InputStream is = Runtime.getRuntime().exec("ls").getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader buff = new BufferedReader (isr);

String line;
while((line = buff.readLine()) != null)
    System.out.print(line);

You get the OutputStream when you want to write/ send some output to Process.

Answer 2

如将OutputStream转换为String中所述 ，将流转换为字符串 ，只需使用Sysrem.out.print（）