最近项目想将比较重要的配置文件加密、综合考虑后决定用java jni实现，步骤如下

1.定义java本地接口

package com.msg.jni;public class JniMsg {static {try {String os = System.getProperty("os.name").toLowerCase();String path = "F:/opt/";System.out.println("work dir:" + path);if (os.contains("windows")) {System.load(path + "/ext/configlib.dll");} else if (os.contains("linux")) {System.load(path + "/ext/configlib.so");}} catch (Exception e) {e.printStackTrace();}}public native String[] getAllCate();}

2.生成c/c++头文件

执行 javah -jni -encoding utf-8 -classpath . com.sc.privatecloud.server.jni.JniMessage 命令生成头文件

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_msg_jni_JniMsg */#ifndef _Included_com_msg_jni_JniMsg
#define _Included_com_msg_jni_JniMsg
#ifdef __cplusplus
extern "C" {
#endif
/** Class:     com_msg_jni_JniMsg* Method:    getAllCate* Signature: ()[Ljava/lang/String;*/
JNIEXPORT jobjectArray JNICALL Java_com_msg_jni_JniMsg_getAllCate(JNIEnv *, jobject);#ifdef __cplusplus
}
#endif
#endif

3.visual studio2013编写c++代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"com_msg_jni_JniMsg.h"#define CATE_CONFIG_LENGTH  2char *cate[482] = { "vBtqcNkMKMZ86RvvhgzNhEBdI3mu4oitNWhOFYOpndsaWivNhZNjCt83AhDR4M9wuZ3Tkxydotb+E70kLxwfcg=="
, "uME16Cvnd9zH+QYuv8dOHJVBYVQvcLVc1/GhUJjKjcV4u1jhOYKljsX9vzuE0Dna"
};jstring   CharToJobjectArray(JNIEnv* env,char **p,int len){jclass objClass = (*env)->FindClass(env, "java/lang/String");jobjectArray strArray = (*env)->NewObjectArray(env,(jsize)len, objClass, 0);jstring jstr;int i = 0;for (; i<len; i++){jstr = (*env)->NewStringUTF(env, p[i]);(*env)->SetObjectArrayElement(env, strArray, i, jstr);}return strArray;}JNIEXPORT jobjectArray JNICALL Java_com_sc_privatecloud_server_jni_JniMessage_getAllCate
(JNIEnv *env, jobject j){return CharToJobjectArray(env,cate,CATE_CONFIG_LENGTH);}

通过visual studio编译成动态链接库configlib.dll ，配置如下

 

4.测试

public class DemoTest {public static void main(String args[]) {JniMsg jnimsg=new JniMsg();String [] config= jnimsg.getAllCate();for(String c:config) {System.out.println(c);}}}输出:
vBtqcNkMKMZ86RvvhgzNhEBdI3mu4oitNWhOFYOpndsaWivNhZNjCt83AhDR4M9wuZ3Tkxydotb+E70kLxwfcg==
uME16Cvnd9zH+QYuv8dOHJVBYVQvcLVc1/GhUJjKjcV4u1jhOYKljsX9vzuE0Dna

web.sendcloud.net