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Ò»¡¢¹ØÓÚJava Native Interface (JNI)
JNIÊÇJAVA±¾µØ±à³Ì½Ó¿Ú£¬ÊôÓÚJDKµÄÒ»²¿·Ö¡£ËüÔÊÐíJAVAÄܹ»²Ù×÷±¾µØAPI»òÓÉÆäËûÓïÑÔ±àдµÄ¶¯Ì¬¿â¡£²»¹ýµ±ÄãʹÓÃÕâÏî¼¼ÊõµÄʱºò£¬ÐèÒª¿¼ÂÇJAVAµÄ¿ÉÒÆÖ²ÐÔ¡£
¶þ¡¢±àдһ¸ö¼òµ¥µÄJNI³ÌÐò
1¡¢±àдһ¸öJAVA³ÌÐò
 
// HelloWorld.java
class HelloWorld
{
//ÉùÃ÷±¾µØ·½·¨,ÒÔnativeΪ¹Ø¼ü×Ö
public native void displayHelloWorld();
static
{
//¼ÓÔØ±¾µØ·½·¨ËùÔڵĶ¯Ì¬¿â
System.loadLibrary("HelloWorld");
}
public static void main(String[] args)
{
new HelloWorld().displayHelloWorld();
}
}
ÖØµã²¿·Ö: a)±¾µØ·½·¨ÒÔnativeΪ¹Ø¼ü×ÖÉùÃ÷ b)¼ÓÔØ¶¯Ì¬¿â
2¡¢±àÒëÔ´³ÌÐò
cmd > javac HelloWorld.java
3¡¢´´½¨.hÎļþÎÒÃÇÐèÒª´ÓHelloWorld.classÎļþÖÐÉú³É¶ÔÓ¦µÄ.hÎļþ£¬ÒÔ±ãÔÚC/C++±àд´úÂë¡£
cmd>javah -jni HelloWorld
Éú³ÉµÄÎļþ(HelloWorld.h)³¤Õâ¸öÑù×Ó:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>/* Header for class HelloWorld */
#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplusextern "C" {
#endif
/* * Class: HelloWorld * Method: displayHelloWorld * Signature: ()V */
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld (JNIEnv *, jobject);
#ifdef __cplusplus}
#endif
#endif

4¡¢¶ÔÓ¦HelloWorld.hÎļþ´´½¨Ò»¸ö.cÎļþ,ʵÏÖ²¿·ÖÔÚÀïÃæ±àд
#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
{
printf("Hello world!\n");
return;
}
5¡¢±àÒë¸Ã.cÎļþ,Éú³Édll
cmd >cl /IC:\j2sdk1.4.2_08\include /IC:\j2sdk1.4.2_08\include\win32 /LD HelloWorld.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.
HelloWorld.c
Microsoft (R) Incremental Linker Version 8.00.50727.42
Copyright (C) Microsoft Corporation. All rights reserve


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