ubuntu 11.04:
cd to a dir:
1,vim HelloWorld.java:
public class HelloWorld { private native void print(); public static void main(String[] args) { new HelloWorld().print(); } static { System.loadLibrary("HelloWorld"); } }
2,然后: javac HelloWorld.java
(make sure CLASSPATH包含.)
3,javah -jni HelloWorld
to gen a HelloWorld.h file
4,vim HelloWorld.c :
#include <jni.h> #include <stdio.h> #include "HelloWorld.h" JNIEXPORT void JNICALL Java_HelloWorld_print(JNIEnv *env,jobject obj){ printf("Hello World!\n"); return ; }
5 cp $JAVA_HOME/include/*.h & include/linux/*.h to /usr/include/
then do:
gcc -fPIC -shared -o libHelloWorld.so HelloWorld.c
or just use :
gcc -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -fPIC -shared -o libHelloWorld.so HelloWorld.c
note don't use -c for HelloWorld.c
6 java -Djava.library.path=. HelloWorld
OK