java 写文件

try{
            String fileName = "域名";//指定文件名
            File file = new File(fileName);
            FileOutputStream out = new FileOutputStream(file);//建立输出流
            byte[] b = new byte[1024];
            String str = "Nice to see you again!";
            b = 域名ytes();//String转化为byte[]
            域名e(b);//写入文本内容
        }
        catch(IOException e){
            域名tln(域名ring());
        }