Best use RF tagged ID cards. Touchless & easy to use. There are also some very good RF tag libraries out there with support for many RF tag providers (better search the java libs first and then decide on the vendor). You will definitely need RF doors (just like in public libraries) or mini RF sensors.
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最好使用带有 RF 标签的 ID 卡。非接触式便于使用。还有一些非常好的 RF 标签库，支持许多 RF 标签提供商（最好先搜索 java 库，然后再决定供应商）。您肯定需要射频门（就像公共图书馆一样）或迷你射频传感器。
Best use RF tagged ID cards. Touchless & easy to use. There are also some very good RF tag libraries out there with support for many RF tag providers (better search the java libs first and then decide on the vendor). You will definitely need RF doors (just like in public libraries) or mini RF sensors.