java调用cmd命令，如何模拟输入Y键

cmd

keytool -import -alias publiccert -file D:\cert.cer -keystore D:\publicCerts.store -storepass  publicstore123

下载cert.cer： http://dl.iteye.com/topics/download/fea5c7ae-79f0-3c29-ab44-a042187ede42

用java程序调用上面的命令

public static String exec(String cmd) {
  StringBuffer sb1;
  StringBuffer sb2;
  sb1 = new StringBuffer();
  sb2 = new StringBuffer();
  String temp1 = "";
  String temp2 = "";
  Runtime rt = Runtime.getRuntime();
  try {
   System.out.println(cmd);
   Process p = rt.exec(cmd);
   BufferedReader bufferedReader1 = new BufferedReader(
     new InputStreamReader(p.getInputStream(),"GBK"));
   BufferedReader bufferedReader2 = new BufferedReader(
     new InputStreamReader(p.getErrorStream()));
   while ((temp1 = bufferedReader1.readLine()) != null) {
    sb1.append(temp1);
    System.out.println(temp1);
   }
   while ((temp2 = bufferedReader2.readLine()) != null) {
    sb2.append(temp2);
    System.out.println(temp2);
   }
   p.waitFor();
   return sb1.toString();
  } catch (Exception e) {
   e.printStackTrace();
  }
  return sb1.toString();
}

程序不能执行完，在cmd窗口输入命令，需要输入“Y”才能走下去




网上一般回复

System.in.read读取输入即可,判断得到的是否为需要的内容.

代码如何实现？


java-cmd相关帖子链接
1. http://www.iteye.com/topic/561256