本地测试，暂无 redis，又不想每次重新 run 之后都去登录（SaToken 默认是存到内存中的）。

LocalFileSaTokenDao .kt:

@Component
class LocalFileSaTokenDao : SaTokenDaoDefaultImpl(), ApplicationListener<ContextClosedEvent> {

    companion object {
        const val DATA_FILE_PATH = "build/sa-token-data.txt"
        const val EXPIRE_FILE_PATH = "build/sa-token-expire.txt"
    }

    @PostConstruct
    fun myInit() {
        val file = File(DATA_FILE_PATH)
        if (file.exists()) {
            ObjectInputStream(file.inputStream()).use {
                while (true) {
                    try {
                        val key = it.readObject() as String
                        val value = it.readObject() as Any
                        dataMap[key] = value
                    } catch (e: EOFException) {
                        break
                    }
                }
            }
        }

        val expireFile = File(EXPIRE_FILE_PATH)
        if (expireFile.exists()) {
            ObjectInputStream(expireFile.inputStream()).use {
                while (true) {
                    try {
                        val key = it.readObject() as String
                        val value = it.readObject() as Long
                        expireMap[key] = value
                    } catch (e: EOFException) {
                        break
                    }
                }
            }
        }
    }

    override fun onApplicationEvent(event: ContextClosedEvent) {
        val dataFile = File(DATA_FILE_PATH)
        ObjectOutputStream(dataFile.outputStream()).use {
            dataMap.forEach { (t, u) ->
                it.writeObject(t)
                it.writeObject(u)
            }
        }

        val expireFile = File(EXPIRE_FILE_PATH)
        ObjectOutputStream(expireFile.outputStream()).use {
            expireMap.forEach { (t, u) ->
                it.writeObject(t)
                it.writeObject(u)
            }
        }
    }

}