Java和C语言混合编程--Windows版

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整个工程下需要的文件：

先来写一下Java的类代码：Sample1.java

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public class Sample1{
public nativeint intMethod(int n);
public nativeboolean booleanMethod(boolean bool);
public nativeString stringMethod(Stringtext);
public nativeint intArrayMethod(int[] intArray);
public staticvoid main(String[] args)
{
System.loadLibrary("SampleC"); //DLL库的名字(C语言Windows XP下)
Sample1 sample= new Sample1();
int square = sample.intMethod(5);
boolean bool = sample.booleanMethod(true);
String text = sample.stringMethod("java");
int sum= sample.intArrayMethod(newint[]{1,2,3,4,5,6,7,8,13});
System.out.println("intMethod: "+ square);
System.out.println("booleanMethod:"+ bool);
System.out.println("stringMethod:"+text);
System.out.println("intArrayMethod:"+sum);
}
}

然后编译Sample1.java
提供一个bat文件编译：JavaMakeUp.bat

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set JAVABIN=D:\ProgramJava\Java\jdk1.6.0_30\bin
set classpath=.;D:\ProgramJava\Java\jdk1.6.0_30\lib
set PATH=%JAVABIN%
javac -classpath -Xlint:unchecked -verbose *.java
pause

将 JAVABIN 和classpath 设置为你们自己的Java路径。
然后双击 JavaMakeUp.bat：
就可以编译出Sample1.class。
Java还有一个强大功能就是根据.calss生成C和C++使用的.h文件文件：
指令如下：
>javah Sample1
生成的.h文件如下：Sample1.h

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/*DONOT EDIT THIS FILE- itis machine generated*/
#include <jni.h>
/* Headerforclass Sample1*/
#ifndef _Included_Sample1
#define _Included_Sample1
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: Sample1
* Method: intMethod
* Signature:(I)I
*/
JNIEXPORT jint JNICALL Java_Sample1_intMethod
(JNIEnv *, jobject, jint);
/*
* Class: Sample1
* Method: booleanMethod
* Signature:(Z)Z
*/
JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod
(JNIEnv *, jobject, jboolean);
/*
* Class: Sample1
* Method: stringMethod
* Signature:(Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_Sample1_stringMethod
(JNIEnv *, jobject, jstring);
/*
* Class: Sample1
* Method: intArrayMethod
* Signature:([I)I
*/
JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod
(JNIEnv *, jobject, jintArray);
#ifdef __cplusplus
}
#endif
#endif

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下面就是写C语言代码了：
使用VC++6.0编写和编译：
SampleC.cpp:

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#include <stdio.h>
#include <string.h>
#include "Sample1.h"
#if 1
/*
* Class: Sample1
* Method: intMethod
* Signature:(I)I
*/
JNIEXPORT jint JNICALL Java_Sample1_intMethod
(JNIEnv *env, jobject obj, jint num)
{
return num*num;
}
/*
* Class: Sample1
* Method: booleanMethod
* Signature:(Z)Z
*/
JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod
(JNIEnv *env, jobject obj, jboolean boolean)
{
return !boolean;
}
/*
* Class: Sample1
* Method: stringMethod
* Signature:(Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_Sample1_stringMethod
(JNIEnv *env, jobject obj, jstringstring)
{
const char *str=env->GetStringUTFChars(string, 0);
char cap[128];
strcpy(cap, str);
env->ReleaseStringUTFChars(string, 0);
return env->NewStringUTF(strupr(cap));
}
/*
* Class: Sample1
* Method: intArrayMethod
* Signature:([I)I
*/
JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod
(JNIEnv *env, jobject obj, jintArrayarray)
{
int i, sum=0;
jsize len = env->GetArrayLength(array);
jint *body=env->GetIntArrayElements(array, 0);
for(i=0; i<len; i++)
{
sum += body[i];
}
env->ReleaseIntArrayElements(array, body, 0);
return sum;
}
#endif

编译也可以使用bat文件编译为DLL库:
VCMakeUp.bat:

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set VCBIN=D:\Microsoft Visual Studio\VC98\Bin
set INCLUDE=D:\Microsoft Visual Studio\VC98\Include
set LIB=D:\Microsoft Visual Studio\VC98\Lib
set JAVA_HOME=D:\ProgramJava\Java\jdk1.6.0_30
set PATH=%VCBIN%
cl /I%JAVA_HOME%\include /I%JAVA_HOME%\include\win32 /c*.cpp
cl /LD /I$%JAVA_HOME%\include /I%JAVA_HOME%\include\win32*.obj /FeSampleC.DLL

VC++6.0路径修改为你自己的电脑路径.
编译出DLL运行既可。
运行指令：
>java Sample1
结果如下：

D:\NewLandWork_LANPENG\Lan_POS_LIB\Java-C>java Sample1
intMethod: 25
booleanMethod:false
stringMethod:JAVA
intArrayMethod:49

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