byte[] byteArray={0x59,0x34,0x45};
        File f = new File("temp.te");
        if(!f.exists())
        {
            try {
                f.createNewFile();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        FileOutputStream fos;
        try {
            fos = new FileOutputStream(f);
            fos.write(byteArray);
            fos.close();
            
            //do something you want;
            
            f.delete();//delete it after using it
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

------解决方案--------------------
探讨

out 这个FileOutputStream 又怎么最终转化为File


------解决方案--------------------
楼主到底要保存什么呢？

一直没搞明白

要不你就ObjectInputStream/ObjectOutputStream

按对象序列化来