考虑一种情况，其中个性化是在卡上完成的，并且大量新数据存储在 javacard 中， 如果我们对 aplet 做了一个小改动，并且想要更新 javacard 上的 applet 版本，那么先前存储在卡上的数据会发生什么情况， 由于每个小程序都有自己的安全域(SD)，我认为所有数据都存储在当前小程序的SD中，因此新安装会删除以前的小程序， 那么存储数据怎么办？
问候
最佳答案
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在链接中，safarmer 说:
Unfortunately you can only delete and the install again. From my understanding this is due to the limited resources on the card. You would need to have two copies of the applet on the card to do an atomic update and then delete the original. I don't think this is a very feasible approach.
The key to doing this is having it done in a controlled environment so you have complete control and can rerun in case of card tear etc. i.e. not update online across the internet.
另外:
You define an applet that stores data and a SIO that you can use to access this applet. The business logic goes into another applet and calls the methods on the interface to get or set data in the other applet. Your business logic can be deleted and reinstalled without affecting data. This is the simplified one paragraph version.
关于javacard - 更改 javacard 小程序的版本，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19886755/