Java执行操作系统命令

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("\n");
}
String result = sb.toString();

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