//最直接的方式是将umsDevTool_sp30.dll放在System32下面，Mapper接口继承Library
Mapper instance3 = (Mapper) Native.loadLibrary("umsDevTool_sp30", Mapper.class);
使用JNA时加载动态库，报错如下：
Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library ‘umsDevTool_sp30‘: Native library (win32-x86-64/umsDevTool_sp30.dll) not found in resource path ([file:/D:/workspaces_for_java/JnaDll/bin/, file:/D:/workspaces_for_java/JnaDll/lib/jna-4.1.0.jar]) at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:271) at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:398) at com.sun.jna.Library$Handler.<init>(Library.java:147) at com.sun.jna.Native.loadLibrary(Native.java:412) at com.sun.jna.Native.loadLibrary(Native.java:391) at com.win32.Mapper.<clinit>(Mapper.java:21) at com.win32.Main.main(Main.java:8)
问题在于：动态库是32位的，而JDK是64位的，所以，如果要调用32位的JDK必须是32位的；相应地，如果动态库是64位的，必须使用64位JDK。
JNA调用DLL报 java.lang.UnsatisfiedLinkError
原文：http://my.oschina.net/u/2245029/blog/487948