netcfg获取虚拟网卡

private String execNetcfg() {        String result = null;        Runtime runt = Runtime.getRuntime();        DataInputStream dis = null;        try {            Process p = runt.exec("netcfg");            InputStream input = p.getInputStream();            StringBuffer sb = new StringBuffer();            dis = new DataInputStream(input);            String content = null;            while ((content = dis.readLine()) != null) {                sb.append(content).append("\n");            }            result = sb.toString();        } catch (IOException e) {            e.printStackTrace();        }        return result;}