我不会以正确或错误的方式向您讲解您要尝试做的事情。但是，如果您尝试调用Java代码（JDBC.jar），那么以下内容适合您。.否则，请随意投票。

JVM.hpp：

#ifndef JVM_HPP_INCLUDED
#define JVM_HPP_INCLUDED

#include "../java/jni.h"
#include <windows.h>
#include <iostream>
#include <stdexcept>
#include <algorithm>

class Jvm
{
    private:
        JavaVM* jvm;
        JNIEnv* env;
        JavaVMInitArgs jvm_args;
        jclass systemClassLoader;

    public:
        Jvm(std::string ClassPath = ".");
        ~Jvm();

        inline JavaVM* GetJVM() const {return jvm;}
        inline JNIEnv* GetENV() const {return env;}
        inline jclass GetSystemClassLoader() const {return systemClassLoader;}
        void DestroyJVM();
        void PrintStackTrace();
        jclass DefineClass(const char* FullClassName, const void* ClassBuffer, std::uint32_t BufferLength);
        jclass DefineClass(const char* FullClassName, jobject ClassLoader, const void* ClassBuffer, std::uint32_t BufferLength);

        void RegisterNativeMethod(const char* MethodName, const char* MethodSignature, void* func_ptr);
        void RegisterNativeMethod(jobject ClassLoader, const char* MethodName, const char* MethodSignature, void* func_ptr);
        void RegisterNativeMethods(JNINativeMethod* Methods, std::uint32_t MethodCount);
        void RegisterNativeMethods(jobject ClassLoader, JNINativeMethod* Methods, std::uint32_t MethodCount);

    protected:
        void InitClassLoader();
};

#endif // JVM_HPP_INCLUDED

JVM.cpp：

#include "JVM.hpp"

Jvm::~Jvm()
{
    env->DeleteGlobalRef(this->systemClassLoader);
    jvm->DestroyJavaVM();
}

Jvm::Jvm(std::string ClassPath) : jvm(NULL), env(NULL), jvm_args(), systemClassLoader(NULL)
{
    JavaVMOption* options = new JavaVMOption[2];
    jvm_args.version = JNI_VERSION_1_6;
    JNI_GetDefaultJavaVMInitArgs(&jvm_args);
    options[0].optionString = const_cast<char*>("-Djava.compiler=NONE");
    options[1].optionString = const_cast<char*>(("-Djava.class.path=" + ClassPath).c_str());
    jvm_args.nOptions = 2;
    jvm_args.options = options;
    jvm_args.ignoreUnrecognized = false;

    if (JNI_CreateJavaVM(&jvm, reinterpret_cast<void**>(&env), &jvm_args))
    {
        delete[] options;
        throw std::runtime_error("Failed To Create JVM Instance.");
    }

    delete[] options;
}

void Jvm::InitClassLoader()
{
    if (!this->systemClassLoader)
    {
        jclass classloader = env->FindClass("Ljava/lang/ClassLoader;");
        if (!classloader)
        {
            throw std::runtime_error("Failed To find ClassLoader.");
        }

        jmethodID SystemLoaderMethod = env->GetStaticMethodID(classloader, "getSystemClassLoader", "()Ljava/lang/ClassLoader;");
        jobject loader = env->CallStaticObjectMethod(classloader, SystemLoaderMethod);
        this->systemClassLoader = reinterpret_cast<jclass>(env->NewGlobalRef(loader));
    }
}

void Jvm::PrintStackTrace()
{
    if (env->ExceptionOccurred())
    {
        env->ExceptionDescribe();
        env->ExceptionClear();
    }
}

jclass Jvm::DefineClass(const char* FullClassName, const void* ClassBuffer, std::uint32_t BufferLength)
{
    this->InitClassLoader();
    return this->DefineClass(FullClassName, this->systemClassLoader, ClassBuffer, BufferLength);
}

jclass Jvm::DefineClass(const char* FullClassName, jobject ClassLoader, const void* ClassBuffer, std::uint32_t BufferLength)
{
    return ClassLoader ? env->DefineClass(FullClassName, ClassLoader, static_cast<const jbyte*>(ClassBuffer), BufferLength) : NULL;
}

void Jvm::RegisterNativeMethod(const char* MethodName, const char* MethodSignature, void* func_ptr)
{
    JNINativeMethod method;
    method.name = const_cast<char*>(MethodName);
    method.signature = const_cast<char*>(MethodSignature);
    method.fnPtr = func_ptr;
    this->RegisterNativeMethods(&method, 1);
}

void Jvm::RegisterNativeMethod(jobject ClassLoader, const char* MethodName, const char* MethodSignature, void* func_ptr)
{
    JNINativeMethod method;
    method.name = const_cast<char*>(MethodName);
    method.signature = const_cast<char*>(MethodSignature);
    method.fnPtr = func_ptr;
    this->RegisterNativeMethods(ClassLoader, &method, 1);
}

void Jvm::RegisterNativeMethods(JNINativeMethod* Methods, std::uint32_t MethodCount)
{
    this->InitClassLoader();
    this->RegisterNativeMethods(this->systemClassLoader, Methods, MethodCount);
}

void Jvm::RegisterNativeMethods(jobject ClassLoader, JNINativeMethod* Methods, std::uint32_t MethodCount)
{
    if (ClassLoader)
    {
        env->RegisterNatives(static_cast<jclass>(ClassLoader), Methods, MethodCount);
    }
}

然后，您可以创建一个实例来加载您的jar。

int main()
{
    Jvm VM("C:/Users/Brandon/IdeaProjects/Eos/out/production/Eos/Bot.jar");

    jclass jMain = VM.GetENV()->FindClass("eos/Main");

    if (jMain != nullptr)
    {
        jmethodID mainMethod = env->GetStaticMethodID(jMain, "main", "([Ljava/lang/String;)V");
        jclass StringClass = env->FindClass("java/lang/String");
        jobjectArray Args = env->NewObjectArray(0, StringClass, 0);
        env->CallStaticVoidMethod(jMain, MainMethod, Args);
    }
}

现在，这仅显示了如何使用Main Method运行jar。但是，您可以从jar中访问ANY类，并使用所需的许多参数来调用它。它不需要主电源。

现在要做很多工作，但是我不会教你。问题是是否可能，答案是肯定的。只要您创建“ JVM”的实例。之后，只需通过Java中的“ Package /
Class”（而不是“ Package.Class”）访问类，然后调用所需的任何方法即可。