64bit linux 에서 jni 간단 test

HelloJNI.java 작성

public class HelloJNI { static { System.loadLibrary("HelloJNI"); } private native void helloJNI(); private native void printString(String string); public static void main(String[] args) { HelloJNI jni = new HelloJNI(); jni.helloJNI(); jni.printString("here is jni!!"); } }

아래 명령어 실행

javac HelloJNI.java javah -classpath . HelloJNI

HelloJNI.c 작성

#include <jni.h> #include <stdio.h> #include "HelloJNI.h" JNIEXPORT void JNICALL Java_HelloJNI_helloJNI(JNIEnv *env, jobject obj) { printf( "Hello JNI!\n" ); return; } JNIEXPORT void JNICALL Java_HelloJNI_printString(JNIEnv *env, jobject obj, jstring string) { const char *str = (*env)->GetStringUTFChars(env,string,0); printf("str = %s\n", str); return; }

아래 명령어 실행

gcc -shared -fPIC -I $JAVA_HOME/include -I $JAVA_HOME/include/linux HelloJNI.c -o libHelloJNI.so java -classpath . -Djava.library.path=. HelloJNI

결과

Hello JNI! str = here is jni!!