流程構建器不接受通過getOutputStream輸入

Question

我想使用流程構建器運行Windows命令。我不確定它爲什麼會退出1，因爲我覺得我給了正確的輸入。如果任何人都能看到它並指導我可能會出錯的地方，那將是非常棒的。

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(); 
      } 

輸出：

亞歷輸入密碼：

Answer 1

使用該工具來獲取錯誤

    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);  
        }