一、创建c文件

SoTest.h

#pragma once
class SoTest
{int Add(int a,int b);
};

SoTest.cpp

#include "SoTest.h"int SoTest::Add(int a, int b) {return a + b;
}

二、创建so文件

/home/ubuntu/projects/SoTest/bin/x64/Debug/libSoTest.so

三、java代码

Maven依赖

<dependency><groupId>net.java.dev.jna</groupId><artifactId>jna</artifactId><version>5.9.0</version>
</dependency>

核心代码 

public class SOTest {public interface SoTest extends Library {static SoTest INSTANCE = Native.load("/home/ubuntu/projects/SoTest/bin/x64/Debug/libSoTest.so", SoTest.class);int _ZN6SoTest3AddEii(String x, int a, int b);         // c方法}public int add(int a, int b) {return SoTest.INSTANCE._ZN6SoTest3AddEii("", a, b);}}

测试关键代码 

    public static void main(String[] args){SOTest soTest = new SOTest();soTest.add(1,1);}