Install the local library file called by JNI

During JNI calling, the local library file is called by the Java Local interface. However, the local library file must be placed in the specified location before the JNI interface can be called, this path is determined by the JVM system variable "Java. library. path. You can print out the path specified by this variable, for example, system. getproperty ("Java. Library. Path "). In a Windows environment, you can see the directory c:/Windows/system32; xxxx/JDK/binxxx; or whatever you want to execute. You only need to place the DLL file in any location. The same principle applies to Linux systems. You only need to place the. So file under the path corresponding to this variable.