JNI DEMO

make.sh

javac -h . HelloJNI.java
g++  -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/dawin" -shared -o  libhelloJNI.dylib HelloJNI.cpp
javac HelloJNI.java
java HelloJNI

HelloJNI.java

public class HelloJNI {
    private native void helloJNI(String  param);

    static{
        System.loadLibrary("helloJNI");
    }
    public static void main(String[] args) {
        HelloJNI jni = new HelloJNI();
        jni.helloJNI("888888");
    }

}

HelloJNI.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloJNI */

#ifndef _Included_HelloJNI
#define _Included_HelloJNI
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     HelloJNI
 * Method:    helloJNI
 * Signature: (Ljava/lang/String;)V
 */
JNIEXPORT void JNICALL Java_HelloJNI_helloJNI
  (JNIEnv *, jobject, jstring);

#ifdef __cplusplus
}
#endif
#endif

　　HelloJNI.cpp

#include "HelloJNI.h"
#include <iostream> 
using namespace std;
JNIEXPORT void JNICALL Java_HelloJNI_helloJNI
  (JNIEnv *env, jobject ,jstring param)
{
   // 1. 获取C风格的字符串
    const char *cstr = env->GetStringUTFChars(param, 0);
    cout <<endl <<"Hello，JNI "<<cstr  <<endl ;
}