Runtime.getRuntime().exec()方法

[Clarity-Black]

调用Runtime.getRuntime().exec("cmd /c start")可以弹出一个dos窗口，并且该方法返回一个Process对象，该类提供了获得输入、输出流的方法getInputStream()，和getOutputStream（）方法；但是我下面这样为什么不能将弹出窗口中的输入，输出到控制台呢？各位大侠帮帮忙啊~

InputStreamReader is = new InputStreamReader(proc.getInputStream());
BufferedReader output = new BufferedReader(is);
String outline;
while ((outline = output.readLine()) != null) {
System.out.println(outline);
}

[feishare]

public class TestRuntime {

public static void main(String[] args) throws IOException {
String filename = "D:\\Program\\TestCode\\out.txt";
String command = "cmd /C dir";

Runtime r = Runtime.getRuntime();
Process p = r.exec(command);

InputStreamReader is = new InputStreamReader(p.getInputStream());
BufferedReader output = new BufferedReader(is);
String outline;
while ((outline = output.readLine()) != null) {
System.out.println(outline);
}
}

[Clarity-Black]

那个command 中间要加一个start才能弹出dos窗口啊，而且这样也不能将dos里的输入读出来写到控制台