JNI入门

可执行的简单例子：http://huangqinqin.iteye.com/blog/1457402

 

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0. edit ./src/HelloWorld.java

1. javac ./src/HelloWorld.java (生成HelloWorld.class)

2.  export PATH=$PATH:/usr/java/jdk1.6.0_45/bin/

     javah -jni com.magc.jni.HelloWorld (要在正确的路径下javah,生成com_magc_jni_HelloWorld.h)

#include <jni.h>

#include "com_magc_jni_HelloWorld.h"

#include <stdio.h>

JNIEXPORT void JNICALL Java_com_magc_jni_HelloWorld_DisplayHello

(JNIEnv *env, jobject obj)

{

    printf("From jni_helloworldImpl.cpp :");

    printf("Hello world ! \n");

    return;

}

 

3.编译生成动态库libHello.so,

命令：g++ -shared -I /usr/java/jdk1.6.0_45/include -I /usr/java/jdk1.6.0_45/include/linux jni_helloworldImpl.cpp -o libHello.so

 

gcc -fPIC -I /usr/java/jdk1.6.0_45/include -I /usr/java/jdk1.6.0_45/include/linux -shared -o libHelloNative.so jni_helloworldImpl.cpp

gcc -fPIC -I /usr/java/jdk1.6.0_45/include  -I /usr/java/jdk1.6.0_45/include/linux -shared -o libHelloNative.so HelloNative.c

4.具体实现的动态库后，就可以运行JAVA调用JNI程序类的native方法了，

命令：java -Djava.library.path=. com.magc.jni.HelloWorld