学步园

//太能折腾了，一个下午终于c++可以调用java中的程序了

#include <iostream>
#include <jni.h>
#include <Windows.h>
#include <fstream>
#include <iostream>
#include <string>


#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else
#define PATH_SEPARATOR ':'
#endif

using namespace std;

/*C字符串转JNI字符串*/ 
jstring stoJstring(JNIEnv* env, const char* pat) 
{ 
	jclass strClass = env->FindClass("Ljava/lang/String;"); 
	jmethodID ctorID = env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V"); 
	jbyteArray bytes = env->NewByteArray(strlen(pat)); 
	env->SetByteArrayRegion(bytes, 0, strlen(pat), (jbyte*)pat); 
	jstring encoding = env->NewStringUTF("utf-8"); 
	jstring rstStr =(jstring) env->NewObject(strClass, ctorID, bytes, encoding);
	return rstStr;
} 

/*JNI字符串转C字符串*/ 
char* jstringTostring(JNIEnv* env, jstring jstr) 
{ 
	char* rtn = NULL; 
	jclass clsstring = env->FindClass("java/lang/String"); 
	jstring strencode = env->NewStringUTF("utf-8"); 
	jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B"); 
	jbyteArray barr= (jbyteArray)env->CallObjectMethod(jstr, mid, strencode); 
	jsize alen = env->GetArrayLength(barr); 
	jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE); 
	if (alen > 0) 
	{ 
		rtn = (char*)malloc(alen + 1); 
		memcpy(rtn, ba, alen); 
		rtn[alen] = 0; 
	} 
	env->ReleaseByteArrayElements(barr, ba, 0); 
	return rtn; 
} 

int main()
{

	/*HMODULE JVM_DLL;
	JVM_DLL = ::LoadLibraryA("C:\\Program Files\\Java\\jdk1.7.0_01\\jre\\bin\\server\\jvm.dll");
	if (JVM_DLL == NULL) 
	{
		cout<<"无法加载连接库：jvm.dll！\n";
		return 0;
	}*/
	HINSTANCE hInstance = ::LoadLibraryA("C:\\Program Files\\Java\\jdk1.7.0_01\\jre\\bin\\server\\jvm.dll");
	//HINSTANCE hInstance = ::LoadLibraryA("jvm.dll");

	JavaVMOption options[1];
	JNIEnv *env;
	JavaVM *jvm;
	JavaVMInitArgs vm_args;
	long status;
	jclass cls;
	jmethodID mid;
	jint square;
	jboolean not;
	jobject jobj;

	options[0].optionString = "-Djava.class.path=.";
	vm_args.version = JNI_VERSION_1_2;
	vm_args.nOptions = 1;
	vm_args.options = options;
	status = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
	if (status != JNI_ERR)
	{
		cls = env->FindClass("nectec/best/wordseg/ThaiSeg");
		if(cls !=0)
		{ 
			/*mid = env->GetStaticMethodID( cls, "add", "(II)I");
			if(mid !=0)
			{  
				square = env->CallStaticIntMethod( cls, mid, 5,5);
				std::cout << square << std::endl;
			}*/
			jmethodID obj = env->GetMethodID(cls,"<init>","()V");
			if(obj !=0)
			{  
				jobj=env->NewObject(cls,obj);
				std::cout << "init ok" << std::endl;
			}
			jmethodID init = env->GetMethodID( cls, "Initial","()V");
			
			if(init !=0)
			{  
				env->CallVoidMethod(jobj, init);
			}
			
			jmethodID token = env->GetMethodID(cls,"Token","(Ljava/lang/String;)Ljava/lang/String;");
			if (token !=0)
			{

				cerr<<"start token\n";
				ifstream in("data.txt");
				ofstream out("result");
				string line;
				int count = 0;
				while(getline(in,line))
				{
					cerr<<++count<<endl;
					jstring msg =(jstring) env-> CallObjectMethod(jobj, token,stoJstring(env, line.c_str()));
					string rst = jstringTostring(env,msg);
					out<<rst<<endl;
				}
				
				//cout<<jstringTostring(env,msg);
	
				out.close();
				in.close();

			}
			
			


		}


		jvm->DestroyJavaVM();
		return 0;
	}
	else
		return -1;

	//::FreeLibrary(JVM_DLL); 
	::FreeLibrary(hInstance); 

}