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第一版，完成native方法调用，后续使功能更丰富。
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‎.idea/MyNativeJava.iml‎

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‎.idea/artifacts/MyNativeJava_jar.xml‎

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‎.idea/compiler.xml‎

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‎.idea/misc.xml‎

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‎.idea/modules.xml‎

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‎README.md‎

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# MyNativeJava
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java和c++交互，调用c++提供的native方法，java使用javah生成头文件，c++实现方法供java调用。 后期会使用该方法提供class文件加解密，java可以使用java -agentlib或-agentpath启动jar包时加载动态库 用于解密jar包中的class文件。
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## 简介
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> java和c++交互，调用c++提供的native方法，java使用javah生成头文件，c++实现方法供java调用。配合工程[MyNativeCpp](https://github.com/feifa168/MyNativeCpp)配套使用。
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后期会使用该方法提供class文件加解密，java可以使用java -agentlib或-agentpath启动jar包时加载动态库
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用于解密jar包中的class文件。使用以下两个命令（例子）。
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* **java -Djava.library.path=./encrypt/ -cp .** Encrypt -src Test.jar -dst Test_encrypt.jar
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* Encrypt是加密程序
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* -src Test.jar -dst Test_encrypt.jar 是其参数，用于加密Test.jar文件，生成Test_encrypt.jar
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>使用环境
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* 环境 win7 64位系统
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* java: IDEA 2018.1 + jdk1.8
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* c++ : CLion 2018.2 + mingw-w64
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* 依赖库及文件
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* **jvm.lib** %JAVA_HOME%\lib
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* **jni.h jni_md.h** %JAVA_HOME%\include;%JAVA_HOME%\include\win32;
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## 模块
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* jni概述
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* native接口文件
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* 动态库提供本地方法
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* java使用本地方法
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### jni概述
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>待补充
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### native接口文件
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>include目录下javah生成的接口文件，使用如下命令
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* 方法1
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* javac -h include com\ft\mynative\MyNativeJava.java
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* 方法2
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* javac com\ft\mynative\MyNativeJava.java 详情参见[MyNativeJava.java](https://github.com/feifa168/MyNativeJava/src/main/java/com/ft/mynative/MyNativeJava.java)
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* javah MyNativeJava
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详情参见 [com_ft_mynative_MyNativeJava.h](https://github.com/feifa168/MyNativeJava/src/main/java/include/com_ft_mynative_MyNativeJava.h)提供测试函数
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### 动态库提供本地方法
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>CLion生成动态库，jdk是64位，原本使用的Mingw是32位程序，生成的dll在64位java程序中不能使用，
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又下载了mingw64，配置使CLion使用64位mingw，CLion使用CMake编译程序。
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动态库部分请参见[本地方法库](https://github.com/feifa168/MyNativeCpp/README.md)
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### java使用本地方法
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>静态块加载dll
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```java
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public class MyNativeJava {
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static {
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System.loadLibrary("libMyNativeJava");
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}
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}
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```
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>加载成功就可以使用native方法了，fun，fun2，fun3是测试用的几个方法，后续会加入更多内容，比如类成员修改，类方法执行等。
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详情参见[MyNativeJava.java](https://github.com/feifa168/MyNativeJava/src/main/java/com/ft/mynative/MyNativeJava.java)
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```java
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public class MyNativeJava {
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static {
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System.loadLibrary("libMyNativeJava");
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}
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private native void fun();
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private native int fun2(String s);
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private native void fun3(Integer[] ia);
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public static void main(String[] args) {
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MyNativeJava nativeHello = new MyNativeJava();
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nativeHello.fun();
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System.out.println(nativeHello.fun2("hello, tom"));
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nativeHello.fun3(new Integer[]{3, 5});
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}
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}
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```
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‎libMyNativeJava.dll‎

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‎out/artifacts/MyNativeJava_jar/MyNativeJava.jar‎

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‎out/artifacts/MyNativeJava_jar/libMyNativeJava.dll‎

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