java 下面执行外部程序

	public void execBat(){
		String path = String.format("%srunMain.bat", getAppRootDir());
		try {
			System.out.println(String.format("bat path = %s", path));
			System.out.println(System.currentTimeMillis());
			Process process = Runtime.getRuntime().exec(path);
			BufferedReader read = new BufferedReader(new InputStreamReader(   
                   process.getInputStream()));   
      String str = null;   
      while ((str = read.readLine()) != null) {   
         System.out.println(str);   
      }
			System.out.println(System.currentTimeMillis());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}