使用Runtime 调用Process.waitfor导致的阻塞问题

  public static void main(String[] args) throws IOException {
        String command = "ping www.baidu.com";
        Process process = Runtime.getRuntime().exec(command);
        int i = process.exitValue();
        System.out.println("字进程退出值："+i);
    }

  public static void main(String[] args) throws IOException {
        String command = "javac";
        Process process = Runtime.getRuntime().exec(command);
        process.waitFor();
        process.destroy();
        int i = process.exitValue();
        System.out.println("字进程退出值："+i);
    }

/**
 * @author lirong
 * @desc CMD命令测试
 * @date 2019/06/13 20:50
 */
@Slf4j
public class ProcessUtils {
    public static void main(String[] args) throws IOException, InterruptedException {
        String command = "ping www.baidu.com";
        Process process = Runtime.getRuntime().exec(command);
        readStreamInfo(process.getInputStream(), process.getErrorStream());
        int exit = process.waitFor();
        process.destroy();
        if (exit == 0) {
            log.debug("子进程正常完成");
        } else {
            log.debug("子进程异常结束");
        }
    }
    /**
     * 读取RunTime.exec运行子进程的输入流 和 异常流
     * @param inputStreams 输入流
     */
    public static void readStreamInfo(InputStream... inputStreams){
        ExecutorService executorService = Executors.newFixedThreadPool(inputStreams.length);
        for (InputStream in : inputStreams) {
            executorService.execute(new MyThread (in));
        }
        executorService.shutdown();
    }
}
/**
 * @author lirong
 * @desc
 * @date 2019/06/13 21:25
 */
@Slf4j
public class MyThread implements Runnable {
    private InputStream in;
    public MyThread(InputStream in){
        this.in = in;
    }
    @Override
    public void run() {
        try{
            BufferedReader br = new BufferedReader(new InputStreamReader(in, "GBK"));
            String line = null;
            while((line = br.readLine())!=null){
                log.debug(" inputStream: " + line);
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

/**
 * @author lirong
 * @desc
 * @date 2019/06/13 20:50
 */
@Slf4j
public class ProcessUtils {
   /**
     * @param timeout 超时时长
     * @param fileDir 所运行程序路径
     * @param command 程序所要执行的命令
     * 运行一个外部命令，返回状态.若超过指定的超时时间，抛出TimeoutException
     */
    public static int executeProcess(final long timeout, File fileDir, final String[] command)
            throws IOException, InterruptedException, TimeoutException {
        Process process = Runtime.getRuntime().exec(command, null, fileDir);
        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;
        }
        @Override
        public void run() {
            InputStream errorStream = null;
            InputStream inputStream = null;
            try {
                errorStream = process.getErrorStream();
                inputStream = process.getInputStream();
                readStreamInfo(errorStream, inputStream);
                exit = process.waitFor();
                process.destroy();
                if (exit == 0) {
                    log.debug("子进程正常完成");
                } else {
                    log.debug("子进程异常结束");
                }
            } catch (InterruptedException ignore) {
                return;
            }
        }
    }
    /**
     * 读取RunTime.exec运行子进程的输入流 和 异常流
     * @param inputStreams 输入流
     */
    public static void readStreamInfo(InputStream... inputStreams){
        ExecutorService executorService = Executors.newFixedThreadPool(inputStreams.length);
        for (InputStream in : inputStreams) {
            executorService.execute(new MyThread(in));
        }
        executorService.shutdown();
    }
}