J2ME如何写入txt

try{            FileConnection fc = (FileConnection)Connector.open("file://localhost/d:/b.txt",Connector.READ_WRITE);                            byte[] b="Hello World".getBytes();                                OutputStream os = fc.openOutputStream();                               os.write(b,0,b.length);                        System.out.println("写入成功");                    }catch (Exception e) {            // TODO: handle exception        }