C++ program in J2EE server

Question

My system has
* One large C++ program exists. I like to use it within the J2EE server or Apache server without much modification.
* The client will input some data via GUI or Webpage(JSP). Then the data will be transferred to the Server for process. C++ program on the server will be executed or called during the process. The result of the C++ program will be used for the following Java program in the server.
My Question is:
* Can I use the following line
Runtime.getRuntime.exec (MY_C++exefile_name) ;
to run the C++ program on the server? If possible, how can I return results of the C++ to the Java program?
* If not possible, what is technology I can integrate C++ codes in the Java Environment?
JNI or CORBA may be options, but I have no experience in that. Which may be simpler?
How long could I to finish this? Could you give me some suggestions?
Thank you very much!

Answer 1

your class must call the program and to redirect the standard input, output and error streams.
//test.exe is name program
String nomePgm = "test";
String comando = "a command";
Runtime rt = null;
String param[] = null;
Process p = null;
// invoca il programma c
try{
rt = Runtime.getRuntime();
p = rt.exec(nomePgm, param);
}catch(IOException e){
     System.err.println("errore "+ e.toString());
//ok processo creato
try{
// si aggancia verso lo standard input stream del programma
OutputStream os = p.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
// si aggancia verso lo standard output stream del programma
InputStream is = p.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
// si aggancia verso lo standard error stream dal programma
InputStream es = p.getErrorStream();
InputStreamReader esr = new InputStreamReader(es);
BufferedReader ber = new BufferedReader(esr);
//scrive verso il programma (invia comando)
bw.write(comando);
bw.flush();
// legge l'output dal programma
// e lo stampa
String s;
while ((s = br.readLine()) != null) {
     //il processo puo' ritornare un intero.
     if(s!=null) risp = Integer.parseInt(s);
// legge l'error stream dal programma
// e lo stampa
String er;
while ((er = ber.readLine()) != null) {
     System.out.println("errore "+ er);
br.close();
bw.close();
ber.close();
}catch(IOException e){
     p.destroy();
System.err.println("errore "+ e.toString());
program c: test.exe
sintassi:
%d      Dati di tipo int
%lf      Dati di tipo double
%c      Dati di tipo char
%s      Dati di tipo string
int main()
int risp;
char inputData[256];
scanf("%s", &inputData); //data from java class
printf("%d\n", risp); //data sent to java class