Java执行操作系统命令

从网上学来的方法，sample:

        try {
            String[] cmd = new String[] { System.getenv("HOMEPATH")    + "/test.bat" };
            Process ps = Runtime.getRuntime().exec(cmd);

            BufferedReader br = new BufferedReader(new InputStreamReader(ps.getInputStream()));
            StringBuffer sb = new StringBuffer();
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line).append("
");
            }
            String result = sb.toString();

            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }