package com.xieshaoping.jni;

/**
 * @author XieShaoping
 */
public class NativeEntity {

    public native String getNativeMsg();

    public NativeEntity(String filename) {
        System.load(filename);
    }

}

package com.xieshaoping.jni;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author XieShaoping
 */
@RestController
public class LoadlibraryController {

    @RequestMapping("loadlibrary")
    public String loadlibrary(String lib) {
        NativeEntity nativeEntity = new NativeEntity(lib);
        String msg = nativeEntity.getNativeMsg();
        System.out.println(msg);
        return msg;
    }

}

javac NativeEntity.java

javah -jni com.xieshaoping.jni.NativeEntity

#include<stdlib.h>
#include<string.h>
#include <stdio.h>  
#include <math.h>
#include <windows.h> //linux下，需要注释
#include "com_xieshaoping_jni_NativeEntity.h"

JNIEXPORT jstring JNICALL Java_com_xieshaoping_jni_NativeEntity_getNativeMsg(JNIEnv* env, jobject obj) //一定要与.h里的保持一致
{
        //打印内容
        char *msg = "正在调用本地本地native方法-windows";
	    printf(msg);
	    //char * 转为jstring
	    jclass strClass = (*env)->FindClass(env, "java/lang/String");
        jmethodID ctorID = (*env)->GetMethodID(env, strClass, "<init>","([BLjava/lang/String;)V");
        jbyteArray bytes = (*env)->NewByteArray(env, strlen(msg));
        (*env)->SetByteArrayRegion(env, bytes, 0, strlen(msg), (jbyte *) msg);
        jstring encoding = (*env)->NewStringUTF(env, "utf-8");
        return (jstring) (*env)->NewObject(env, strClass, ctorID, bytes, encoding);
}

gcc -m64  -Wl,--add-stdcall-alias -I"D:\MyTool\Java\jdk1.8.0_251\include" -I"D:\MyTool\Java\jdk1.8.0_251\include\win32" -shared WindowsNative.c

http://localhost:8080/loadlibrary?lib=D%3A%5CMyProject%5Cjni%5Csrc%5Cmain%5Cjava%5Ccom%5Cxieshaoping%5Cjni%5Ca.exe

export JAVA_HOME=/root/jdk1.8.0_311
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib

gcc -I"/root/jdk1.8.0_311/include" -I"/root/jdk1.8.0_311/include/linux" -fPIC -shared LinuxNative.c