[笔记] 用C++通过JavaVM调用jar包

最新推荐文章于 2023-05-24 16:57:36 发布

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本文介绍如何将使用Java Swing编写的GUI应用移植到C++中，包括JNI的使用、环境配置和关键步骤说明。

看了半天文档,Java的swing写个List要那么多代码...

而后台基础都用Java写好了...

想移植到C++上,咋办呢?

#include "jni.h" #include "windows.h" #include "stdafx.h" typedef jint (WINAPI *_CreateJavaVM)(JavaVM **, void **, void *); int _tmain(int argc, _TCHAR* argv[]) { int res; JavaVMInitArgs vm_args; JavaVMOption options[3]; JavaVM *jvm; JNIEnv *env; /*设置初始化参数*/ options[0].optionString = "-Djava.compiler=NONE"; //Disabled JIT options[1].optionString = "-Djava.class.path=.;hello.jar"; options[2].optionString = "-verbose:NONE"; vm_args.version = JNI_VERSION_1_6; vm_args.nOptions = 3; vm_args.options = options; vm_args.ignoreUnrecognized = JNI_TRUE; // Load jvm.dll HINSTANCE hInstance = LoadLibrary(L"C://Program Files//Java//jre6//bin//client//jvm.dll"); if (hInstance == NULL) return false; _CreateJavaVM m_CreateJavaVM = (_CreateJavaVM)GetProcAddress(hInstance, "JNI_CreateJavaVM"); res = (*m_CreateJavaVM)(&jvm, (void**)&env, &vm_args); if (res < 0) return -1; // Find the class jclass HelloClass = env->FindClass("app/Hello"); // Find the main method id jmethodID Hello_main = env-> GetStaticMethodID(HelloClass, "main", "([Ljava/lang/String;)V"); // Call the main method. env->CallStaticVoidMethod(HelloClass, Hello_main); jvm->DestroyJavaVM(); FreeLibrary(hInstance); return 0; }

然后再把工程属性里的附加包含目录添加:

....../jdk1.6.0_25/include

....../jdk1.6.0_25/include/win32

其他对于Java里各种操作的C++实现参见JNI就好了....