java jna调用so动态链接库详细步骤

末蓝、 2023-10-06 18:17 46阅读 0赞

**jni 调用so库：**[https://blog.csdn.net/u014644574/article/details/118606177][https_blog.csdn.net_u014644574_article_details_118606177]

### 1、简介 ###

**JNI（Java Native Interface）调用过程**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hqaW5nMTIz_size_16_color_FFFFFF_t_70][]

**那什么是JNA呢？**

JNA(Java Native Access)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。

### 2、准备so文件 ###

创建HelloWorld.c

#include "HelloWorld.h"
     
    JNIEXPORT void JNICALL
    Java_HelloWorld_myprint(JNIEnv *env,jobject obj){
    	printf("Hello World !\n");
    	return;
    }

生成HelloWorld.so文件，详细参考[https://blog.csdn.net/u014644574/article/details/118606177][https_blog.csdn.net_u014644574_article_details_118606177]

gcc -Wl,--add-stdcall-alias -shared -IC:\jdk1.8.0_211\include -IC:\jdk1.8.0_211\include\win32 -o HelloWorld.so HelloWorld.c

### 3、创建maven项目 ###

### 4、将上面生成的so文件放在项目resource文件夹下 ###

### 5、准备一个类，用于解析so文件 ###

package com.demo.so.test;
    
    import com.sun.jna.Library;
    import com.sun.jna.Native;
     
    //继承Library，用于加载库文件
    public interface Clibrary extends Library {
     
        // [Native.synchronizedLibrary] 阻止多线程同时访问本地代码
        Clibrary INSTANTCE = (Clibrary) Native.synchronizedLibrary(
                (Clibrary) Native.loadLibrary(
                        Clibrary.class.getResource("/HelloWorld.so")
                            .getPath()
                            .substring(1)// substring(1)的原因是在Windows下获取到的路径前面会多一个斜杠，但在Linux下不会
                        , Clibrary.class
                )
        );
     
        // 此方法为so文件中的c语言函数 Java_HelloWorld_myprint
        void Java_HelloWorld_myprint();
        
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pqcTg1MjUzMzQ0NQ_size_16_color_FFFFFF_t_70][] ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pqcTg1MjUzMzQ0NQ_size_16_color_FFFFFF_t_70 1][]

### 6、编写测试类 ###

package com.demo.so.test;
    
    public class Demo {
    
    	public static void main(String[] args) {
    		Clibrary instance = Clibrary.INSTANTCE;
    		instance.Java_HelloWorld_myprint();
    	}
    
    }

运行结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQ2NDQ1NzQ_size_16_color_FFFFFF_t_70][]

[https_blog.csdn.net_u014644574_article_details_118606177]: https://blog.csdn.net/u014644574/article/details/118606177
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pqcTg1MjUzMzQ0NQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190214105958850.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pqcTg1MjUzMzQ0NQ==,size_16,color_FFFFFF,t_70
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