commons-exec 包中有 org.apache.commons.exec.LogOutputStream 类
可以通过继承该类实现一个实时输出的队列 读取阻塞队列里的内容来获取命令输出结果
Java管道流使用起来问题比较多，不太方便且控制不好容易出现IOException

PumpStreamHandler streamHandler = new PumpStreamHandler(CommandExecOutputStream);

public class CommandExecOutputStream extends LogOutputStream {
    
    static Logger logger = LoggerFactory.getLogger(CommandExecOutputStream.class);
    
    private BlockingQueue<String> queue;
    
    public CommandExecOutputStream(){
        
    }
    
    public CommandExecOutputStream(BlockingQueue<String> queue){
        this.queue = queue;
    }
    
    @Override
    protected void processLine(String line, int level) {
        try {
            logger.debug("{}",line);
            queue.put(line);
        } catch (InterruptedException e) {
            logger.error("命令执行过程输出InterruptedException",e);
        }
    }
}

我自问自答，参考verifyJobPriority方法，需要对PipedInputStream流做关闭的动作。
所以，AbstractCommonExecs可以这么修改：

    PipedOutputStream outputStream = new PipedOutputStream();
    PipedInputStream pis = new PipedInputStream(outputStream);
    ByteArrayOutputStream errorStream = new ByteArrayOutputStream();
    PumpStreamHandler streamHandler = new PumpStreamHandler(outputStream,errorStream);
    executor.setStreamHandler(streamHandler);
    int ret = executor.execute(cmdLine);
            
    BufferedReader br = new BufferedReader(new InputStreamReader(pis, getEncoding()));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while((line = br.readLine()) != null) {
        sb.append(line+"\n");
        if(line.startsWith(getCodeInfokey())) {
            er.setCodeInfo(line);
        }
    }
    pis.close();
    String stdout = sb.toString();

注意这个pis.close()调用。