Java Runtime.getRunTime().exec(CMD) not supporting pipes

Question

I\'m attempting to write a program that will display and be able to update your IP address settings using a JFrame window. I am looking at running this purely on windows so

Answer 1

Fortunately, there is a way to run a command containing pipes. The command must be prefixed with cmd /C. e.g.:

public static void main(String[] args) throws Exception {
    String command = "cmd /C netstat -ano | find \"3306\"";
    Process process = Runtime.getRuntime().exec(command);
    process.waitFor();
    if (process.exitValue() == 0) {
        Scanner sc = new Scanner(process.getInputStream(), "IBM850");
        sc.useDelimiter("\\A");
        if (sc.hasNext()) {
            System.out.print(sc.next());
        }
        sc.close();
    } else {
        Scanner sc = new Scanner(process.getErrorStream(), "IBM850");
        sc.useDelimiter("\\A");
        if (sc.hasNext()) {
            System.err.print(sc.next());
        }
        sc.close();
    }
    process.destroy();
}

---

Notes

• The console of Windows use IBM850 encoding. See Default character encoding for java console output.
• See Stupid Scanner tricks... for useDelimiter("\\A").