Process p = Runtime.getRuntime().exec(command);
is = p.getInputStream();
byte userbytes = new byte;
Unless you're stuck on an ancient JVM,
java.lang.ProcessBuilder makes it much easier to specify a process, set up its environment, spawn it, and handle its file descriptors.
This class is used to create operating system processes.
ProcessBuilderinstance manages a collection of process attributes. The
start()method creates a new
Processinstance with those attributes. The
start()method can be invoked repeatedly from the same instance to create new subprocesses with identical or related attributes.
Starting a new process which uses the default working directory and environment is easy:
Process p = new ProcessBuilder("myCommand", "myArg").start();
Here is an example that starts a process with a modified working directory and environment:
ProcessBuilder pb = new ProcessBuilder("myCommand", "myArg1", "myArg2"); Map<String, String> env = pb.environment(); env.put("VAR1", "myValue"); env.remove("OTHERVAR"); env.put("VAR2", env.get("VAR1") + "suffix"); pb.directory(new File("myDir")); Process p = pb.start();