Java和C语言混合编程--Windows版

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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1. public class Sample1{
   
2.     public nativeint intMethod(int n);
   
3.     public nativeboolean booleanMethod(boolean bool);
   
4.     public nativeString stringMethod(Stringtext);
   
5.     public nativeint intArrayMethod(int[] intArray);
   
6.     
   
7.     public staticvoid main(String[] args)
   
8.     {
   
9.         System.loadLibrary("SampleC"); //DLL库的名字(C语言Windows XP下)
   
10.         Sample1 sample= new Sample1();
    
11.         
    
12.         int square = sample.intMethod(5);
    
13.         boolean bool = sample.booleanMethod(true);
    
14.         String text = sample.stringMethod("java");
    
15.         int sum= sample.intArrayMethod(newint[]{1,2,3,4,5,6,7,8,13});
    
16.         
    
17.         System.out.println("intMethod: "+ square);
    
18.         System.out.println("booleanMethod:"+ bool);
    
19.         System.out.println("stringMethod:"+text);
    
20.         System.out.println("intArrayMethod:"+sum);
    
21.         
    
22.     }
    
23.     
    
24. }

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

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1. set JAVABIN=D:\ProgramJava\Java\jdk1.6.0_30\bin
   
2. set classpath=.;D:\ProgramJava\Java\jdk1.6.0_30\lib
   
3. 
   
4. 
   
5. set PATH=%JAVABIN%
   
6. javac -classpath -Xlint:unchecked -verbose *.java
   
7. 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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1. /*DONOT EDIT THIS FILE- itis machine generated*/
   
2. #include <jni.h>
   
3. /* Headerforclass Sample1*/
   
4. 
   
5. #ifndef _Included_Sample1
   
6. #define _Included_Sample1
   
7. #ifdef __cplusplus
   
8. extern "C" {
   
9. #endif
   
10. /*
    
11.  * Class: Sample1
    
12.  * Method: intMethod
    
13.  * Signature:(I)I
    
14.  */
    
15. JNIEXPORT jint JNICALL Java_Sample1_intMethod
    
16.   (JNIEnv *, jobject, jint);
    
17. 
    
18. /*
    
19.  * Class: Sample1
    
20.  * Method: booleanMethod
    
21.  * Signature:(Z)Z
    
22.  */
    
23. JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod
    
24.   (JNIEnv *, jobject, jboolean);
    
25. 
    
26. /*
    
27.  * Class: Sample1
    
28.  * Method: stringMethod
    
29.  * Signature:(Ljava/lang/String;)Ljava/lang/String;
    
30.  */
    
31. JNIEXPORT jstring JNICALL Java_Sample1_stringMethod
    
32.   (JNIEnv *, jobject, jstring);
    
33. 
    
34. /*
    
35.  * Class: Sample1
    
36.  * Method: intArrayMethod
    
37.  * Signature:([I)I
    
38.  */
    
39. JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod
    
40.   (JNIEnv *, jobject, jintArray);
    
41. 
    
42. #ifdef __cplusplus
    
43. }
    
44. #endif
    
45. #endif

请大家支持一下我的 商城: www.yangcheng520.com  谢谢了。
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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1. #include <stdio.h>
   
2. #include <string.h>
3. #include "Sample1.h"
   
4. 
   
5. 
   
6. #if 1
   
7. 
   
8. /*
   
9.  * Class: Sample1
   
10.  * Method: intMethod
    
11.  * Signature:(I)I
    
12.  */
    
13. JNIEXPORT jint JNICALL Java_Sample1_intMethod
    
14.   (JNIEnv *env, jobject obj, jint num)
    
15. {
    
16.     return num*num;
    
17. }
    
18. 
    
19. 
    
20. /*
    
21.  * Class: Sample1
    
22.  * Method: booleanMethod
    
23.  * Signature:(Z)Z
    
24.  */
    
25. JNIEXPORT jboolean JNICALL Java_Sample1_booleanMethod
    
26.   (JNIEnv *env, jobject obj, jboolean boolean)
    
27. {
    
28.     return !boolean;
    
29. }
    
30. 
    
31. /*
    
32.  * Class: Sample1
    
33.  * Method: stringMethod
    
34.  * Signature:(Ljava/lang/String;)Ljava/lang/String;
    
35.  */
    
36. JNIEXPORT jstring JNICALL Java_Sample1_stringMethod
    
37.   (JNIEnv *env, jobject obj, jstringstring)
    
38. {
    
39.     const char *str=env->GetStringUTFChars(string, 0);
    
40.     char cap[128];
    
41.     strcpy(cap, str);
    
42.     env->ReleaseStringUTFChars(string, 0);
    
43.     return env->NewStringUTF(strupr(cap));
    
44. }
    
45. 
    
46. /*
    
47.  * Class: Sample1
    
48.  * Method: intArrayMethod
    
49.  * Signature:([I)I
    
50.  */
    
51. JNIEXPORT jint JNICALL Java_Sample1_intArrayMethod
    
52.   (JNIEnv *env, jobject obj, jintArrayarray)
    
53. {
    
54.     int i, sum=0;
    
55.     jsize len = env->GetArrayLength(array);
    
56.     jint *body=env->GetIntArrayElements(array, 0);
    
57.     for(i=0; i<len; i++)
    
58.     {
    
59.         sum += body[i];
    
60.     }
    
61.     env->ReleaseIntArrayElements(array, body, 0);
    
62.     return sum;
    
63. }
    
64. 
    
65. #endif

编译也可以使用bat文件编译为DLL库:
VCMakeUp.bat:

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1. set VCBIN=D:\Microsoft Visual Studio\VC98\Bin
   
2. set INCLUDE=D:\Microsoft Visual Studio\VC98\Include
   
3. set LIB=D:\Microsoft Visual Studio\VC98\Lib
   
4. set JAVA_HOME=D:\ProgramJava\Java\jdk1.6.0_30
   
5. 
   
6. 
   
7. set PATH=%VCBIN%
   
8. 
   
9. cl /I%JAVA_HOME%\include /I%JAVA_HOME%\include\win32 /c*.cpp
   
10. 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