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
        }