Android(Java):jni源代码

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Button btn = new Button(this);
btn.setText("测试ndk");
btn.setOnClickListener(new ButtonOnClickListener());
setContentView(btn);
Toast.makeText(getApplicationContext(), PATH, Toast.LENGTH_LONG).show();
}

public final class ButtonOnClickListener implements OnClickListener{

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
byte[] data = "zhanghongliu".getBytes();
FileInputStream fis = null;
FileOutputStream fos = null;
int i = 0;
for(i=1;i<=200000;i++){
try {
fis = new FileInputStream(RESOURCEPATH);
int size = fis.available();
data = new byte[size];
fis.read(data, 0, size);
String result = FileJNILib.videoCrypt(data,ENCRYPTPATH);
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();

data = FileJNILib.videoDerypt(ENCRYPTPATH);
fos = new FileOutputStream(DECRYPTPATH);
fos.write(data);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if(null != fis){
fis.close();
}
if(null != fos){
fos.close();
}
data = null;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Log.i("count", i+"");
//data = null;
}
//Toast.makeText(getApplicationContext(), new String(data), Toast.LENGTH_LONG).show();
//show();
}

public void show(){
File newfile = new File(PATH);
FileInputStream inStream = null;
try {
inStream = new FileInputStream(newfile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
}
String content = FileUtil.readInStream(inStream);
Log.i("FileText", content);
Toast.makeText(getApplicationContext(), content, Toast.LENGTH_LONG).show();
}

}

public static String readInStream(FileInputStream inStream){
try {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = -1;
while((length = inStream.read(buffer)) != -1 ){
outStream.write(buffer, 0, length);
}
outStream.close();
inStream.close();
return outStream.toString();
} catch (IOException e) {
Log.i(TAG, e.getMessage());
}
return null;
}

public class FileJNILib {

static {
System.loadLibrary("filejni");
}
public static native String videoCrypt(byte[] content, String dest_file);
public static native byte[] videoDerypt(String dest_file);

public static native String videoDerypt(String dest_file, ByteArrayOutputStream outputstream);

}

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <jni.h> //jni的主要头文件

#include <android/log.h>
#define LOG_TAG "JNI"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
/* Header for class com_test_jni_FileJNILib */

/*
* Class: com_test_jni_FileJNILib
* Method: videoCrypt
* Signature: ([BLjava/lang/String;)V
*/
JNIEXPORT jstring JNICALL videoCrypt
(JNIEnv * env, jclass thiz, jbyteArray content, jstring dest_file){
//env->GetStringUTFChars(source,NULL);

const char *path = (*env)->GetStringUTFChars(env, dest_file, NULL);
LOGI(path);

FILE *fp = fopen(path,"wb");
if(fp==NULL){
LOGI("fopen error");
(*env)->ReleaseStringUTFChars(env,dest_file, path);
return (*env)->NewStringUTF(env, "fopen error");
}
char *data = (*env)->GetByteArrayElements(env,content, 0);
int size = (*env)->GetArrayLength(env,content);
//int iLen = sizeof(data);//C语言中判断数据类型或者表达式长度符
LOGI("file size is %d", size);

crypt(data,size);

/******文件写入方法***********/
//fputc('c',fp);
//fputs(data,fp);
fwrite(data,size,1,fp);
//fprintf(fp,"%s",data);
/*****************/

fclose(fp);
(*env)->ReleaseByteArrayElements(env,content,data,0);
(*env)->ReleaseStringUTFChars(env,dest_file, path);
LOGI("execute complete");
return (*env)->NewStringUTF(env, "encrypt successful");
}

/*
* Class: com_test_jni_FileJNILib
* Method: videoDerypt
* Signature: (Ljava/lang/String;)[B
*/
JNIEXPORT jbyteArray JNICALL videoDerypt
(JNIEnv * env, jclass thiz, jstring dest_file){
const char *path = (*env)->GetStringUTFChars(env, dest_file, NULL);
LOGI(path);

/*****得到文件长度*******/
int size;
struct stat tFileStat;
if( stat(path, &tFileStat ) )
{
LOGI("file not found error");
(*env)->ReleaseStringUTFChars(env,dest_file, path);
return NULL;
}
size=tFileStat.st_size;
LOGI("file size is %d",size);//报错 int
/************/

/*****分配内存*******/
char *temp = NULL;
temp=(char*)malloc(size);
if(temp == NULL)
{
LOGI("malloc error");
(*env)->ReleaseStringUTFChars(env,dest_file, path);
return NULL;
}
// memset(temp,0x00,size*sizeof(char)+1);//初始化内存
/************/

FILE *fp = fopen(path,"rb");
if(fp==NULL){
LOGI("fopen error");
(*env)->ReleaseStringUTFChars(env,dest_file, path);
free(temp);//释放内存
temp=NULL;
return NULL;
}

/******文件读方法***********/
//fgetc(fp);
//fgets(temp,100,fp);
fread(temp,size,1,fp);
//fscanf(fp,"%s",temp);
/*****************/

fclose(fp);

crypt(temp,size);

jbyteArray jarrRV =(*env)->NewByteArray(env,size);
jbyte *jby =(*env)->GetByteArrayElements(env,jarrRV, 0);
memcpy(jby, temp, size);//复制数据
(*env)->SetByteArrayRegion(env,jarrRV, 0,size, jby);//将Jbyte 转换为jbarray数组
(*env)->ReleaseByteArrayElements(env,jarrRV,jby,0);//释放jby数组* 解决长时间运行退出问题内部引用超过指定数量
//(*env)->DeleteLocalRef(env,jarrRV);//影响程序
//(*env)->DeleteLocalRef(env,temp);//不对一般用malloc申请内存，free释放
free(temp);
temp=NULL;
(*env)->ReleaseStringUTFChars(env,dest_file, path);
LOGI("execute complete");
return jarrRV;
}

void crypt(char *data, int size){
int i;
char sPwd[]="************************";
int pwdLen = sizeof(sPwd);
//LOGI("dongao.com mobile_encrypt %d",pwdLen);
int count=0;
for(i=0; i<size; i++)
{
if(count >= pwdLen) count = 0;
data[i]=data[i]^sPwd[count++];
//LOGI("%c",sPwd[count >= 10 ?count=0:count++]);
}
}

/*
* Class: com_test_jni_FileJNILib
* Method: videoDerypt
* Signature: (Ljava/lang/String;Ljava/io/ByteArrayOutputStream;)V
*/
JNIEXPORT jstring JNICALL videoDerypt2ByteArray
(JNIEnv * env, jclass thiz, jstring dest_file, jobject outputstream){
return NULL;
}

static const JNINativeMethod gMethods[] = { //定义批量注册的数组，是注册的关键部分
{"videoCrypt", "([BLjava/lang/String;)Ljava/lang/String;", (void*)videoCrypt} ,// func2是在java中声明的native函数名，"()V"是函数的签名，可以通过javah获取。
{"videoDerypt", "(Ljava/lang/String;)[B", (void*)videoDerypt},
{"videoDerypt", "(Ljava/lang/String;Ljava/io/ByteArrayOutputStream;)Ljava/lang/String;", (void*)videoDerypt2ByteArray}
};

JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void *reserved) //这是JNI_OnLoad的声明，必须按照这样的方式声明

{

JNIEnv* env = NULL; //注册时在JNIEnv中实现的，所以必须首先获取它

jint result = -1;

if((*vm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_4) != JNI_OK) //从JavaVM获取JNIEnv，一般使用1.4的版本

return -1;

jclass clazz;

static const char* const kClassName="com/test/jni/FileJNILib";

clazz = (*env)->FindClass(env, kClassName); //这里可以找到要注册的类，前提是这个类已经加载到java虚拟机中。这里说明，动态库和有native方法的类之间，没有任何对应关系。

if(clazz == NULL)

{

LOGI("cannot get class:%s\n", kClassName);

return -1;

}

if((*env)->RegisterNatives(env, clazz,gMethods, sizeof(gMethods)/sizeof(gMethods[0]))!= JNI_OK) //这里就是关键了，把本地函数和一个java类方法关联起来。不管之前是否关联过，一律把之前的替换掉！

{

LOGI("register native method failed!\n");

return -1;

}

return JNI_VERSION_1_4; //这里很重要，必须返回版本，否则加载会失败。

}

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