JNA(Java Native Access )提供一组Java工具类用于在运行期动态访问系统本地库(native library:如Window的dll)而不需要编写任何Native/JNI代码。(JNA(Java Native Access) provides a set of Java utility classes for dynamic Access to the system's Native library (such as Windows DLL) in the runtime without having to write any Native/JNI code.)