JAVA JNI ʹÓÃʵÀý
JAVA¿ÉÒÔͨ¹ýJNI½Ó¿Ú·ÃÎʱ¾µØµÄ¶¯Ì¬Á¬½Ó¿â£¬´Ó¶øÀ©Õ¹JAVAµÄ¹¦ÄÜ¡£Ê¹ÓÃJAVA JNI½Ó¿ÚÖ÷Òª°üÀ¨ÒÔϲ½Ö裺
(1)±àдJAVA´úÂ룬עÃ÷Òª·ÃÎʵı¾µØ¶¯Ì¬Á¬½Ó¿âºÍ±¾µØ·½·¨£»
(2)±àÒëJAVA´úÂëµÃµ½.classÎļþ£»
(3)ʹÓÃjavah -jni Éú³É¸ÃÀà¶ÔÓ¦µÄCÓïÑÔ.hÎļþ£»
(4)ʹÓÃC/C++ʵÏÖ£¨3£©Éú³ÉµÄ.hÎļþÖÐÉùÃ÷µÄ¸÷º¯Êý£»
(5)±àÒëC/C++ʵÏÖ´úÂëÉú³É¶¯Ì¬Á¬½Ó¿â¡£
±¾ÎÄʹÓÃÒ»¸ö¼òµ¥µÄhelloWorldʾÀýÑÝʾJNIµÄʹÓá£
£¨1£©±àдJAVA´úÂë
public class helloWorld
{
public native void SayHello(String name);
static
{
System.loadLibrary("examdll");
}
public static void main(String [] argv)
{
helloWorld hello = new helloWorld();
hello.SayHello("myName");
}
}
£¨2£©±àÒëJAVA´úÂë
javac helloWorld.java
£¨3£©Éú³ÉʵÏÖº¯ÊýÍ·Îļþ
javah -classpath . helloWorld
µÃµ½µÄÎļþÄÚÈÝÈçÏ£º
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class helloWorld */
#ifndef _Included_helloWorld
#define _Included_helloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: helloWorld
* Method: SayHello
* Signature: (Ljava/lang/String;)V
*/
JNIEXPORT void JNICALL Java_helloWorld_SayHello
(JNIEnv *, jobject, jstring);
#ifdef __cplusplus
}
#endif
#endif
£¨4£©ÔÚVCÖÐʵÏÖÉÏÊöº¯Êý
#include "helloWorld.h"
#include <stdio.h>
#include <string.h>
void JNICALL Java_helloWorld_SayHello(JNIEnv * env, jobject obj, jstring str)
{
jboolean b = true;
char s[80];
memset(s, 0, sizeof(s));
strcpy_s(s ,(char*)env->GetStringUTFChars(str, &b));
printf("Hello, %s", s);
env->ReleaseStringUTFChars(str , NULL);
}
**** ÕâÊ
Ïà¹ØÎĵµ£º
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJ ......
unixϵͳ£º´ò¿ªshellÃüÁîÐÐ
ÊäÈëvi _bash_profile ÐÞ¸Ä
JA ......
public class Fibonacci {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
NumOfFibonacci(9);
}
public static int MyFibonacci(int i){
if(i>0) {
if(i == 1)return 1;
if(i == 2)return 1;
else return MyFibonacc ......
/**
* ÕÒ³öËÄλÊýËùÓеÄÎüѪ¹íÊý×Ö
* ÎüѪ¹íÊý×Ö£ºÎ»ÊýΪżÊýµÄÊý×Ö¿ÉÒÔÓÉÒ»¶ÔÊý×ÖÏà³Ë¶øµÃ£¬Õâ¶ÔÊý×Ö°üº¬³Ë»ýÒ»°ëµÄλÊý
* È磺1260 = 21*60
*/
public class Vampire {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String s= ......
½Ó¿ÚÖв»¿ÉÒÔ¶¨Òå¹¹Ôì·½·¨
½Ó¿ÚÖÐÖ»ÄÜÓÐ public static final µÄ±äÁ¿ ºÍ public abstract µÄ·½·¨£¬ÆäËü¶¼²»¿ÉÒÔ¡£
ÀýÈ磺
´úÂëÀïÊÇÕâÑùдµÄ
public interface B{
StringBuilder sb=null;
void fun();
& ......