JNA(JavaNativeAccess)框架是一个开源的Java框架，是SUN公司主导开发的，建立在

经典的JNI的基础之上的一个框架。JNA使Java调用原生函数就像.NET上的P/Invoke一样方便、快捷。这里是jna.jar包的两个版本：3.1和4.0。-JNA (JavaNativeAccess) Framework is an open source Java framework, is leading the development of SUN company, to establish a framework based on the classic above the JNI. JNA enable Java to call native functions just as easy to P/Invoke .NET on, fast. Here are two versions jna.jar package: 3.1 and 4.0.