可設定 Timeout 之 Java Command Line Executor

import java.util.concurrent.TimeoutException;

public class TimeoutCommandLine {

    public static int executeCommandLine(String commandLine, long timeout)
            throws Exception {

        Process process = Runtime.getRuntime().exec(commandLine);

        Worker worker = new Worker(process);

        worker.start();

        try {

            worker.join(timeout);

            if (worker.exit != null) {

                return worker.exit;

            } else {

                throw new TimeoutException();

            }

        } catch (InterruptedException ex) {

            worker.interrupt();

            Thread.currentThread().interrupt();

            throw ex;

        } finally {

            process.destroy();

        }

    }

    private static class Worker extends Thread {

        private final Process process;

        private Integer exit;

        private Worker(Process process) {

            this.process = process;

        }

        public void run() {

            try {

                exit = process.waitFor();

            } catch (InterruptedException ignore) {

                return;

            }

        }

    }

}
使用方式：
TimeoutCommandLine.executeCommandLine("rsh xxxHost hostname", 2000);
設定執行 command rsh xxxHost hostname , 超過 2秒 沒回應即回傳 TimeoutException。