Execute program from servlet

[MAF]

Hi!!

I want to execute an .exe program from a servlet. Can you give me an idea on how can this be done?
Thanks
M. [sig][/sig]

 

[Otto]

Similar to execute from an application. Here is a simle code:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;


public class GnuplotServlet extends HttpServlet {
static String gnuplot="D:/Program Files/gnuplot/wgnupl32.exe";

public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
ServletOutputStream out=res.getOutputStream();
String plotIn="/gnuplot"+Math.random();
String plotOut=plotIn+".gif";
String[] command={gnuplot, plotIn};

// Create command file for gnuplot
try {
PrintStream fileIn=new PrintStream(new FileOutputStream(plotIn));
fileIn.println("set terminal gif"
fileIn.println("set output \""+plotOut+"\""
fileIn.println("set xrange [0:12.5663]"
fileIn.println("plot sin(x)"
fileIn.println("reset"
fileIn.close();
} catch (Exception e) {}

try {
byte[] buffer = new byte[4096];
int read;
BufferedInputStream pOut;

Runtime r=Runtime.getRuntime();
Process p=r.exec(command);
p.waitFor();
pOut=new BufferedInputStream(new FileInputStream(plotOut));
res.setContentType("image/gif"
while ((read=pOut.read(buffer))!=-1) {
if (read>0) { out.write(buffer, 0, read); }
}
pOut.close();
} catch (Exception e) { out.println(e.toString()); }
out.close();
try { new File(plotIn).delete();
} catch (Exception e) {}
try { new File(plotOut).delete();
} catch (Exception e) {}
}
public void init(ServletConfig config) throws ServletException {
String s;

super.init(config);
// paramTterek beolvasßsa
if ((s=getInitParameter("GnuplotPath&quot)==null) {
gnuplot=s;
}
}
}

The main code is: Runtime.getRuntime().exec(command);
This code runs the wgnupl32.exe, redirect the output to a file (gif image), and then give the image back to the browser.

Good luck. Bye, Otto.
[sig][/sig]