JNI动态注册native方法及JNI数据使用(3)

[I jintArray int[] 
[F jfloatArray float[] 
[B jbyteArray byte[] 
[C jcharArray char[] 
[S jshortArray short[] 
[D jdoubleArray double[] 
[J jlongArray long[] 
[Z jbooleanArray boolean[] 
如图： 

好了，所有 的介绍也完了，那么我们就来实现我们的代码：（果断把h文件删除，看效果） 
JNIUtil.c：

jstring call(JNIEnv* env, jobject thiz) { return (*env)->NewStringUTF(env, ); } jint sum(JNIEnv* env, jobject jobj,jint num1,jint num2){ return num1+num2; } /** * 方法对应表 */ static JNINativeMethod gMethods[] = { {, , (void*)call}, {, , (void*)sum}, }; /* * 为某一个类注册本地方法 */ static int registerNativeMethods(JNIEnv* env , const char* className , JNINativeMethod* gMethods, int numMethods) { jclass clazz; clazz = (*env)->FindClass(env, className); if (clazz == NULL) { return JNI_FALSE; } if ((*env)->RegisterNatives(env, clazz, gMethods, numMethods) < 0) { return JNI_FALSE; } return JNI_TRUE; } /* * 为所有类注册本地方法 */ static int registerNatives(JNIEnv* env) { return registerNativeMethods(env, JNIREG_CLASS, gMethods, sizeof(gMethods) / sizeof(gMethods[0])); } /* * System.loadLibrary()时调用 * 如果成功返回JNI版本, 失败返回-1 */ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) { JNIEnv* env = NULL; jint result = -1; if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) { return -1; } assert(env != NULL); if (!registerNatives(env)) {//注册 return -1; } //成功 result = JNI_VERSION_1_4; return result; }

代码写完了，主要也是利用findClass来获取方法，从而实现方法的调用。效果重现： 

demo 传送梦：RegisterNatives.rar

JNI数据类型及常用方法（JNI安全手册）

基本类型和本地等效类型表：

引用类型： 

接口函数表:

const struct JNINativeInterface ... = { NULL, NULL, NULL, NULL, GetVersion, DefineClass, FindClass, NULL, NULL, NULL, GetSuperclass, IsAssignableFrom, NULL, Throw, ThrowNew, ExceptionOccurred, ExceptionDescribe, ExceptionClear, FatalError, NULL, NULL, NewGlobalRef, DeleteGlobalRef, DeleteLocalRef, IsSameObject, NULL, NULL, AllocObject, NewObject, NewObjectV, NewObjectA, GetObjectClass, IsInstanceOf, GetMethodID, CallObjectMethod, CallObjectMethodV, CallObjectMethodA, CallBooleanMethod, CallBooleanMethodV, CallBooleanMethodA, CallByteMethod, CallByteMethodV, CallByteMethodA, CallCharMethod, CallCharMethodV, CallCharMethodA, CallShortMethod, CallShortMethodV, CallShortMethodA, CallIntMethod, CallIntMethodV, CallIntMethodA, CallLongMethod, CallLongMethodV, CallLongMethodA, CallFloatMethod, CallFloatMethodV, CallFloatMethodA, CallDoubleMethod, CallDoubleMethodV, CallDoubleMethodA, CallVoidMethod, CallVoidMethodV, CallVoidMethodA, CallNonvirtualObjectMethod, CallNonvirtualObjectMethodV, CallNonvirtualObjectMethodA, CallNonvirtualBooleanMethod, CallNonvirtualBooleanMethodV, CallNonvirtualBooleanMethodA, CallNonvirtualByteMethod, CallNonvirtualByteMethodV, CallNonvirtualByteMethodA, CallNonvirtualCharMethod, CallNonvirtualCharMethodV, CallNonvirtualCharMethodA, CallNonvirtualShortMethod, CallNonvirtualShortMethodV, CallNonvirtualShortMethodA, CallNonvirtualIntMethod, CallNonvirtualIntMethodV, CallNonvirtualIntMethodA, CallNonvirtualLongMethod, CallNonvirtualLongMethodV, CallNonvirtualLongMethodA, CallNonvirtualFloatMethod, CallNonvirtualFloatMethodV, CallNonvirtualFloatMethodA, CallNonvirtualDoubleMethod, CallNonvirtualDoubleMethodV, CallNonvirtualDoubleMethodA, CallNonvirtualVoidMethod, CallNonvirtualVoidMethodV, CallNonvirtualVoidMethodA, GetFieldID, GetObjectField, GetBooleanField, GetByteField, GetCharField, GetShortField, GetIntField, GetLongField, GetFloatField, GetDoubleField, SetObjectField, SetBooleanField, SetByteField, SetCharField, SetShortField, SetIntField, SetLongField, SetFloatField, SetDoubleField, GetStaticMethodID, CallStaticObjectMethod, CallStaticObjectMethodV, CallStaticObjectMethodA, CallStaticBooleanMethod, CallStaticBooleanMethodV, CallStaticBooleanMethodA, CallStaticByteMethod, CallStaticByteMethodV, CallStaticByteMethodA, CallStaticCharMethod, CallStaticCharMethodV, CallStaticCharMethodA, CallStaticShortMethod, CallStaticShortMethodV, CallStaticShortMethodA, CallStaticIntMethod, CallStaticIntMethodV, CallStaticIntMethodA, CallStaticLongMethod, CallStaticLongMethodV, CallStaticLongMethodA, CallStaticFloatMethod, CallStaticFloatMethodV, CallStaticFloatMethodA, CallStaticDoubleMethod, CallStaticDoubleMethodV, CallStaticDoubleMethodA, CallStaticVoidMethod, CallStaticVoidMethodV, CallStaticVoidMethodA, GetStaticFieldID, GetStaticObjectField, GetStaticBooleanField, GetStaticByteField, GetStaticCharField, GetStaticShortField, GetStaticIntField, GetStaticLongField, GetStaticFloatField, GetStaticDoubleField, SetStaticObjectField, SetStaticBooleanField, SetStaticByteField, SetStaticCharField, SetStaticShortField, SetStaticIntField, SetStaticLongField, SetStaticFloatField, SetStaticDoubleField, NewString, GetStringLength, GetStringChars, ReleaseStringChars, NewStringUTF, GetStringUTFLength, GetStringUTFChars, ReleaseStringUTFChars, GetArrayLength, NewObjectArray, GetObjectArrayElement, SetObjectArrayElement, NewBooleanArray, NewByteArray, NewCharArray, NewShortArray, NewIntArray, NewLongArray, NewFloatArray, NewDoubleArray, GetBooleanArrayElements, GetByteArrayElements, GetCharArrayElements, GetShortArrayElements, GetIntArrayElements, GetLongArrayElements, GetFloatArrayElements, GetDoubleArrayElements, ReleaseBooleanArrayElements, ReleaseByteArrayElements, ReleaseCharArrayElements, ReleaseShortArrayElements, ReleaseIntArrayElements, ReleaseLongArrayElements, ReleaseFloatArrayElements, ReleaseDoubleArrayElements, GetBooleanArrayRegion, GetByteArrayRegion, GetCharArrayRegion, GetShortArrayRegion, GetIntArrayRegion, GetLongArrayRegion, GetFloatArrayRegion, GetDoubleArrayRegion, SetBooleanArrayRegion, SetByteArrayRegion, SetCharArrayRegion, SetShortArrayRegion, SetIntArrayRegion, SetLongArrayRegion, SetFloatArrayRegion, SetDoubleArrayRegion, RegisterNatives, UnregisterNatives, MonitorEnter, MonitorExit, GetJavaVM, };