流程构建器不接受通过getOutputStream输入

Question

我想使用流程构建器运行Windows命令。我不确定它为什么会退出1，因为我觉得我给了正确的输入。如果任何人都能看到它并指导我可能会出错的地方，那将是非常棒的。

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：

亚历输入密码：

Answer 1

使用该工具来获取错误

    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);  
        }