jni入门

Java源码

class HelloWorld {
    public static native void displayHelloWorld();
    static {
        System.loadLibrary("hello");
    }
    public static void main(String[] args) {
        displayHelloWorld();
    }
}

编译

javac HelloWorld.java

生成头文件

javah -classpath . -jni HelloWorld

C代码
HelloWorld.c

#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
{
    printf("Hello native world!\n");
return;
}

编译成hello.dll后 运行java HelloWorld
结果为

Hello native world!