Process Builder 不接受通过 getOutputStream 的输入

Question

我正在尝试使用进程生成器运行 Windows 命令。我不确定为什么它以 1 退出，因为我觉得我给出了正确的输入。如果有人可以查看并指导我可能错在哪里，那就太好了？

   try{
          ProcessBuilder pb = new ProcessBuilder("runas","/noprofile","/user:alex", "cmd");
          Process p = pb.start();
          OutputStream os = p.getOutputStream();
          PrintStream ps = new PrintStream(os);
          ps.println("password");
          ps.flush();

          System.out.println(p.waitFor());
          BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
          String resultLine = in.readLine();
          while (resultLine != null) {
              System.out.println(resultLine);
             resultLine = in.readLine();
          }
      }
           catch (IOException e) {
              e.printStackTrace();
          } 

输出：

1

输入alex的密码：

Answer 1

使用它来获取错误

                  System.out.println(p.waitFor());
                  BufferedReader in = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                  String resultLine = in.readLine();
                  while (resultLine != null) {
                      resultLine = in.readLine();
                      System.out.println(resultLine);    
                     }