PipedInputStream in = new PipedInputStream();
 PipedOutputStream out = new PipedOutputStream(in);
 new Thread(
      () -> {
          try {
              '''''''''  //写入输出流 
              out.close();
          } catch (IOException | DocumentException e) {
              throw new RuntimeException(e);
          }
      }
 ).start();
//输入流in 处理