Eclipse JEE JAVA JNI 调用dll动态链接库(VC DLL)

╰半橙微兮° 2022-05-24 07:16 235阅读 0赞

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一、Eclipse 创建调用dll类，记住你的包名和类名，创建dll要用到

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二、设置调用dll路径，VC生成的dll要放在此目录，JAVA就可以加载了，在工程菜单->Properties->Java Build Path->Source->Native library location->edit：根据自己工程目录结构自己选择一个dll存放路径。我选择的是工程目录下lib目录。

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三、根据刚才创建的调用dll类，用VC制作dll动态链接库，文件->新建项目->Visual C++->Win32->Win32 控制台应用程序

名字自己随便。

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删除不用的cpp和h文件，我的目录结构如下图

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AESEncryption、Base64Encode、MD5Util、Tool是我自己创建的类。jni、jni\_md.h在JAVA安装目录中搜索，复制到VC目录。

com\_cnicfhnui\_Tool\_ZMDlib.cpp.h是根据刚才在JAVA中创建的类文件来命名

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com\_cnicfhnui\_Tool\_ZMDlib.h内容，其中我自己实现了三个方法

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com\_cnicfhnui\_Tool\_ZMDlib.cpp内容

\#include"jni.h"   
\#include "com\_cnicfhnui\_Tool\_ZMDlib.h"    
\#include<stdio.h>    
\#include"jni\_md.h"    
// AES 加密测试  
JNIEXPORT jstring JNICALL Java\_com\_cnicfhnui\_Tool\_ZMDlib\_AESEncryption  
(JNIEnv \*env, jobject thiz, jstring Encryption, jstring Key)  
\{  
CTool mTool;  
CAESEncryption mCAESEncryption;  
CBase64Encode mCBase64Encode;  
char Base64Result\[4096\];  
unsigned char \*EncryptionResultStr; // 128  
const char \*EncryptionStr = env->GetStringUTFChars(Encryption, 0);  
const char \*KeyStr = env->GetStringUTFChars(Key, 0);  
aes\_context ctx;// AES上下文结构体  
int len = 0;  
unsigned char CharKey\[16\];  
//LOGE("Key:%s %lu", KeyStr,strlen(KeyStr));  
  
  
if (strlen(KeyStr) != 16)\{  
return env->NewStringUTF("KeyError");  
\}  
if (mTool.IsCharacter((char \*)KeyStr) != 0)\{  
return env->NewStringUTF("KeyError");  
\}  
memcpy(CharKey, KeyStr, 16);  
printf("要加密的字符串:%s %s", EncryptionStr, KeyStr);  
mCAESEncryption.aes\_setkey\_enc(&ctx, CharKey, 128);// 256);  
printf("加密....");  
EncryptionResultStr = mCAESEncryption.aes\_crypt\_ecb(&ctx, AES\_ENCRYPT, (unsigned char \*)EncryptionStr, strlen(EncryptionStr), &len);  
printf("base64\_encode....");  
mCBase64Encode.base64\_encode((unsigned char \*)EncryptionResultStr, (char \*)Base64Result, len);  
printf("加密结果字符串:%s", Base64Result);  
env->ReleaseStringUTFChars(Encryption, EncryptionStr);  
env->ReleaseStringUTFChars(Key, KeyStr);  
return env->NewStringUTF(Base64Result);  
\}  
// AES 解密  
JNIEXPORT jstring JNICALL Java\_com\_cnicfhnui\_Tool\_ZMDlib\_AESDecryption  
(JNIEnv \*env, jobject thiz, jstring Decryption, jstring Key)  
\{  
CTool mTool;  
CAESEncryption mCAESEncryption;  
CBase64Encode mCBase64Encode;  
unsigned char Base64Decode\[4096\];  
unsigned char \*DecryptionResultStr; // 128  
const char \*DecryptionStr = env->GetStringUTFChars(Decryption, 0);  
const char \*KeyStr = env->GetStringUTFChars(Key, 0);  
aes\_context ctx;// AES上下文结构体  
int len = 0;  
unsigned char CharKey\[16\];  
//LOGE("Key:%s %lu", KeyStr,strlen(KeyStr));  
  
  
if (strlen(KeyStr) != 16)\{  
return env->NewStringUTF("KeyError");  
\}  
if (mTool.IsCharacter((char \*)KeyStr) != 0)\{  
return env->NewStringUTF("KeyError");  
\}  
memcpy(CharKey, KeyStr, 16);  
printf("要解密的字符串:%s  %s", DecryptionStr, KeyStr);  
memset(Base64Decode, 0, 4096);  
len = mCBase64Encode.base64\_decode((char \*)DecryptionStr, (unsigned char \*)Base64Decode);  
mCAESEncryption.aes\_setkey\_dec(&ctx, CharKey, 128);// 256);  
int slen = 0;  
DecryptionResultStr = mCAESEncryption.aes\_crypt\_ecb(&ctx, AES\_DECRYPT, Base64Decode, len, &slen);  
printf("解密....%d", slen);  
DecryptionResultStr\[slen\] = '\\0';  
//DecryptionResultStr\[slen + 1\] = '\\0';  
printf("解密结果字符串:%s", DecryptionResultStr);  
env->ReleaseStringUTFChars(Decryption, DecryptionStr);  
env->ReleaseStringUTFChars(Key, KeyStr);  
if (!mTool.IsUTF8((unsigned char\*)DecryptionResultStr, strlen((char\*)DecryptionResultStr)))  
\{  
return env->NewStringUTF("No utf-8");  
\}  
return env->NewStringUTF((char \*)DecryptionResultStr);  
\}  
// MD5 加密测试  
JNIEXPORT jstring JNICALL Java\_com\_cnicfhnui\_Tool\_ZMDlib\_MD5Encryption  
(JNIEnv \*env, jobject thiz, jstring Encryption)  
\{  
CMD5Util mCMD5Util;  
int i = 0;  
const char \*EncryptionStr = env->GetStringUTFChars(Encryption, 0);  
printf("要加密的字符串:%s", EncryptionStr);  
unsigned char digest\[16\];  
unsigned char EncryptionResultStr\[33\]; // 128  
mCMD5Util.Data((const unsigned char \*)EncryptionStr, strlen(EncryptionStr), digest);  
for (i = 0; i < 16; i++) \{  
EncryptionResultStr\[(i \* 2)\] = ("0123456789ABCDEF"\[digest\[i\] >> 4\]);  
EncryptionResultStr\[(i \* 2) + 1\] = ("0123456789ABCDEF"\[digest\[i\] & 0x0f\]);  
\}  
EncryptionResultStr\[32\] = 0;  
env->ReleaseStringUTFChars(Encryption, EncryptionStr);  
return env->NewStringUTF((char \*)EncryptionResultStr);

四、生成dll并调用，编译VC工程得到dll文件，编译之前关闭对应文件的预编译头，就是stdafx.h，在cpp文件右键属性，C/C++->预编译头->不使用预编译头。注意平台，如果安装的是64位JAVA，VC要新建X64平台编译dll，否则不能调用，提示错误Can't load IA 32-bit .dll on a AMD 64-bit platform。默认32位

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编译生成

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把dll复制到刚才Eclipse 中Properties->Java Build Path->Source->Native library location->edit设置的目录中

在Eclipse 中调用

ZMDlib mZMDlib = new ZMDlib();    
  
        String AESEncryptionResult = mZMDlib.AESEncryption("AES加密测试，中文英文1234567890ABCDEF,./","1234567890abcdEF");  
        System.out.print("AES加密结果："+AESEncryptionResult+"\\r\\n");//84BsN1Sy4F27e11ole6woKjO+/NB5K5ubX4EflB5zXBuOCRrA+G/gtd/GMbemW0TZxOQb3wy3XLG2hdVSVwhKQ==  
  
  
        String AESDecryptionResult = mZMDlib.AESDecryption("84BsN1Sy4F27e11ole6woKjO+/NB5K5ubX4EflB5zXBuOCRrA+G/gtd/GMbemW0TZxOQb3wy3XLG2hdVSVwhKQ==","1234567890abcdEF");  
        System.out.print("AES解密结果："+AESDecryptionResult+"\\r\\n");//AES加密测试，中文英文1234567890ABCDEF,./  
  
        String MD5EncryptionResult = mZMDlib.MD5Encryption("84BsN1Sy4F27e11ole6woKjO+/NB5K5ubX4EflB5zXBuOCRrA+G/gtd/GMbemW0TZxOQb3wy3XLG2hdVSVwhKQ==");  
        System.out.print("MD5加密结果：" + MD5EncryptionResult+"\\r\\n");//A0532310DFC9C3F87962B23A29049DFE

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