如何使用C ++打开Java程序

Question

I am trying to make a Java program, but I want it to be opened by C++.

I have been this using in C++

system("java -jar MMQ4.jar");

But it requires the users to add C:\\Program Files\\Java\\jre7\\bin\\ to their PATH environmental variable

So, is their another way to run a Java program using C++?

Answer 1

running java files does NOT require the user to add something to environment variables, thats simply wrong as the Java-installer already does that automatically.

If you cant run the the java-binary without adding something to the environment your JRE is faulty and you need to reinstall. Please dont believe everything you read on internet forums, this statement is a really old myth, it was true about 5 years ago for JDK-releases but everyting after that .... not so much

Answer 2

One solution, not nice in my opinion is:

system("export LD_LIBRARY_PATH=\"<java_path>\" && java -jar MMQ4.jar");

This solution is valid for unix so

For windows, take a look here .

update:

By the way, if I understand what are your intentions, you should use:

fork
exec
wait

rather than system.

const int pid = fork();
execv("java", "-jar MMQ4.jar"");

In this way you have a reference to PID's process and kill it when you want.

Answer 3

Have you tried using the -classpath option to the Java interpreter. It's been some time since I've used Java, but in the past, that would have worked.